Bankrupted Beggar European GPS Galileo WHOLE SYSTEM DOWN! No Signal for 2 days! GPGT!

[Tony Tan]

The Galileo are Pentagonal Symbols, and VANISHED from sky as I just verified. The bankrupted beggars Chow Ang Moh after 17 years of effort finally went live in 2016 only 3 yrs ago, with Galileo. And their Signal qualities are degraded so fast! Their web says SERVICE DEGRADATION = ALL 33 satellites!

https://www.gsc-europa.eu/system-status/Constellation-Information

Constellation Information


Constellation Status
Satellite Name1
SV ID2
Clock3
Status4
Active NAGU5
NAGU Type6
NAGU Subject7
GSAT0101
E11
2019025 GENERAL SERVICE DEGRADATION
GSAT0102
E12


2019025
GENERAL
SERVICE DEGRADATION
GSAT0103
E19


2019025 GENERAL SERVICE DEGRADATION
GSAT0104
E20
RAFS
NOT AVAILABLE
2014014
UNP_UNUFN
UNAVAILABLE FROM 2014-05-27 UNTIL FURTHER NOTICE
GSAT0201
E18
PHM
TESTING
2019020
GENERAL
TESTING OF GSAT0201
GSAT0202
E14
PHM
TESTING
2019021
GENERAL
TESTING OF GSAT0202
GSAT0203
E26

2019025
GENERAL
SERVICE DEGRADATION
GSAT0204
E22
RAFS
NOT USABLE
2017045
GENERAL
GSAT0204 REMOVED FROM ACTIVE SERVICE ON 2017-12-08 UNTIL FURTHER NOTICE FOR CONSTELLATION MANAGEMENT PURPOSES
GSAT0205 E24 2019025 GENERAL SERVICE DEGRADATION GSAT0206 E30 2019025 GENERAL SERVICE DEGRADATION GSAT0207 E07 2019025 GENERAL SERVICE DEGRADATION GSAT0208 E08 2019025 GENERAL SERVICE DEGRADATION GSAT0209 E09 2019025 GENERAL SERVICE DEGRADATION GSAT0210 E01 2019025 GENERAL SERVICE DEGRADATION GSAT0211 E02 2019025 GENERAL SERVICE DEGRADATION GSAT0212 E03 2019025 GENERAL SERVICE DEGRADATION GSAT0213 E04 2019025 GENERAL SERVICE DEGRADATION GSAT0214 E05 2019025 GENERAL SERVICE DEGRADATION GSAT0215 E21 2019025 GENERAL SERVICE DEGRADATION GSAT0216 E25 2019025 GENERAL SERVICE DEGRADATION GSAT0217 E27 2019025 GENERAL SERVICE DEGRADATION GSAT0218 E31 2019025 GENERAL SERVICE DEGRADATION GSAT0219 E36 2019025 GENERAL SERVICE DEGRADATION GSAT0220 E13 2019025 GENERAL SERVICE DEGRADATION GSAT0221 E15 2019025 GENERAL SERVICE DEGRADATION GSAT0222 E33 2019025 GENERAL SERVICE DEGRADATION

1: Satellite Name: Galileo Satellite (GSAT) identifier of the satellites:

• GSAT01XX: IOV satellites
• GSAT02XX: FOC satellites

2: SV ID: Space Vehicle (SV) Identifier is the Galileo satellite ranging code identifier. ‘E’ is the Galileo system constellation indicator.
3: Clock: PHM = Passive Hydrogen Maser, RAFS = Rubidium Atomic Frequency Standard.
4: Status:

• USABLE: satellite is operational and contributing to the service provision.
• NOT AVAILABLE: satellite is not operational and it is not contributing to the service provision (NAGU issued prior to Service Declaration).
• NOT USABLE: satellite is not operational and it is not contributing to the service provision (NAGU issued after Service Declaration).
• TESTING: satellite may be used only for testing purposes.
• UNDER COMMISSIONING: satellite is under In-Orbit Test (IOT) phase.

5: Active NAGU: link to the applicable NAGU.
6: NAGU Type: information about the type of the applicable NAGU (see NAGU Information section).
7: NAGU Subject: content of the ‘NAGU Subject’ field of the applicable NAGU (see NAGU Information section).


Updated: Jul 12, 2019

NAGU Type NAGU Number Date of start event Date of publication (UTC) NAGU Subject Satellites affected GENERAL 2019025 2019-07-11 01:00 2019-07-11 14:45 SERVICE DEGRADATION ALL GENERAL 2019021 2019-03-23 13:02 2019-05-23 15:30 TESTING OF GSAT0202 GSAT0202 GENERAL 2019020 2019-02-27 06:02 2019-05-23 15:05 TESTING OF GSAT0201 GSAT0201 GENERAL 2017045 2017-12-08 07:30 2017-11-23 17:45 GSAT0204 REMOVED FROM ACTIVE SERVICE FOR CONSTELLATION MANAGEMENT PURPOSES GSAT0204 GENERAL 2016063 2016-12-15 12:00 2016-12-15 12:00 GALILEO INITIAL OPEN SERVICE (OS) DECLARATION ALL SATELLITES WITH USABINIT NAGU ISSUED

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欧洲伽利略系统"挂了"：卫星导航信号无法更新

欧洲伽利略系统"挂了"：卫星导航信号无法更新



125

伽利略挂了。不是指伟大的科学家伽利略·伽利雷，而是四大全球卫星导航系统之一的，由欧盟建设的伽利略系统挂了。
据“监测评估中心”报道，伽利略系统在UTC时间2019年7月10日14-15和17时（北京时间7月10日22-23和7月11日01时）出现3个小时的异常，其卫星导航信号的广播星历没有更新。
Part.1
什么是卫星导航系统？
卫星导航系统，简称GNSS系统，它是距离我们一群两万公里的星星，它们不会发光也不会发热，甚至肉眼没有办法观察到它们，为我们提供着位置服务。
在卫星导航系统俱乐部中一共有4位VIP会员，除了欧盟的伽利略系统、大家所熟知的美国GPS系统以外，包括俄罗斯的GLONASS系统、以及我们国家自主建设的北斗卫星导航定位系统。
Part.2
是时候跟你们介绍下北斗卫星导航系统
北斗卫星导航定位系统，由空间段、地面段和用户段三部分组成，是我国自主建设、独立运行的卫星导航系统，是为全球用户提供全天候、全天时、高精度的定位、导航和授时服务的国家重要空间基础设施。
据新华社报道，北斗三号基本系统已完成建设。根据计划，2020年10月前，由北斗二号和北斗三号系统共同提供服务；2020年10月后，将可以说，北斗，不仅是中国的北斗，也是世界的北斗。
中科院光电研究院的徐颖，在中科院SELF格致论道讲坛曾说：“北斗系统从诞生到现在，虽然已经通过多方面证明，精度和可靠性，完全不输GPS导航系统。或许你会问：有GPS了，还要北斗干嘛？事实上，GPS系统并没有想象的那么可靠。因为GPS系统只被我们开放了民码信号，而GPS民码信号战争时候很容易说变就变，为了保障自主权，欧盟建设了伽利略系统。对我们来讲也是如此，为了保障我们的可靠性，国家开始建设属于我们自己的北斗系统。”

Part.3
北斗的应用 只有你想不到
北斗系统不仅能提供位置、导航和授时这样的功能，而且还提供通信功能。
美国GPS之父帕金森教授曾经这样盛赞北斗的导航通信一体化功能：“既能够知道你在哪里，也能够知道我在哪里，这是多么美妙的体验。”
目前北斗已广泛应用于交通运输、海洋渔业、水文监测、气象预报、测绘地理信息、森林防火、通信时统、电力调度、救灾减灾、应急搜救等领域。
北斗亮，中国强！
中国北斗，拥抱全球。
来源：“中国科普博览”公众号（kepubolan）



关键字 : 卫星导航北斗卫星

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欧洲伽利略导航系统服务中断 卫星信号仍未恢复

欧洲伽利略导航系统服务中断 卫星信号仍未恢复



504

[文/观察者网 赵挪亚]
刚刚具备全部导航功能，欧盟的“伽利略”卫星导航系统就“挂”了……
欧洲全球导航卫星系统局11日发布公告称，从世界标准时间（UTC）7月11日1点开始，用户将经历“伽利略”卫星导航系统的服务中断，信号将不可用，具体恢复时间待定。

官方11日发布的服务降级公告 图自欧洲全球导航卫星系统局
截止到UTC时间7月12日8时，“伽利略”的服务仍旧未恢复。有监测数据显示，本次服务中断，与卫星导航信号的广播星历确实有关。
导航卫星行业权威杂志“Inside GNSS”12日援引欧洲全球导航卫星系统局内部消息称，团队正在全力恢复“伽利略”的服务，修复工作预计将在当地时间7月13-14日完成。
对于本次服务中断，观察者网评论员施佬分析称，在2019年“伽利略”具备全部导航功能的关键时刻，出现如此重大的事故，毫无疑问会重挫市场对这一系统的信心。
“服务降级”
根据欧洲全球导航卫星系统局11日发布的公告显示，“伽利略”卫星导航系统的服务中断从UTC时间当天1点开始。不过，根据“全球连续监测评估中心”（iGMAS）11日数据显示，从UTC时间7月10日14-15时以及17时起，“伽利略”已经出现异常。

UTC时间10日14-15时和17时，“伽利略”广播星历变灰 图自iGMAS
iGMAS是《中国第二代卫星导航系统重大专项实施方案》明确安排的三大试验系统之一，是对全球四大卫星导航系统运行状况和主要性能指标进行监测和评估，生成高精度精密星历和卫星钟差、地球定向参数、跟踪站坐标和速率、全球电离层延迟等产品的信息平台。而监测评估中心是其重要组成部分。
12日，监测评估中心在其官方微信公众号中表示，UTC时间7月11日21时50分后，“伽利略”系统彻底中断服务，而截至到UTC时间7月12日8时，服务仍旧未恢复。

UTC时间7月11日22时开始，全部变灰 图自iGMAS
此外，监测评估中心12日表示，采用iGMAS平台7月11日全天的星历数据分析发现，“伽利略”中断服务后，定位性能下降。通过对比中断前后全球综合结果，发现中断服务后水平方向服务性能下降8%，高程方向下降251%，这也进一步证实了“伽利略”服务性能下降。

可以明显看到，在“伽利略”中断服务以后，定位计算结果出现明显偏差 图自iGMAS监测评估中心
“伽利略”可靠性堪忧？
“伽利略”定位系统，是一个正在建造中的卫星定位系统，该系统由欧盟通过欧洲空间局和欧洲导航卫星系统管理局建造，是全球四大定位系统之一，其目的在于建立欧洲自己的卫星导航系统，摆脱依赖美国“全球定位系统”（GPS）的局面。
2011年8月21日，“伽利略”首颗卫星发射，该系统计划发射30颗卫星，将于2020年前发射完成。2019年，“伽利略”系统开始具备完全工作能力。

欧盟的“伽利略”定位系统 图自欧洲航天局
根据iGMAS数据显示，本次“伽利略”出现服务中断，其卫星导航信号的广播星历没有更新。

广播星历是由全球定位系统的地面控制部分所确定和提供的，是定位卫星发播的无线电信号上载有预报一定时间内卫星轨道根数的电文信息，经过解码获得的卫星星历推算得到卫星位置，目前广播星历主要用于导航定位和低等级的工程测量。
广播星历数据中断，表明现有的“伽利略”系统现有的24颗卫星全部崩溃。
卫星导航系统的精度是基于自身轨道、时间等参数的精准信息，这些信息将通过星历广播给用户。因此，在本次“伽利略”系统出现的故障后，用户无法获得卫星更新的各项参数，这也导致导航的精度下降。
此外，导航星历偶尔缺失，对在使用中的接收机影响不大，因为可以用过期的星历，但如果缺失时间长，精度会发散直至不可用。
对于“伽利略”系统本次发生的数据中断，观察者网评论员施佬分析称：“伽利略系统作为当代全球四大导航系统之一，原本计划在2019年具备全部导航功能，在此关键时刻发生的严重事故毫无疑问将重挫市场对于这套新兴导航系统的信心，加深对其系统可靠性的担忧，影响其未来的推广和应用前景。”



关键字 : 导航卫星中国

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European Galileo system "hangs up": satellite navigation signals cannot be updated


European Galileo system "hangs up": satellite navigation signals cannot be updated



125



Galileo hung up. It does not refer to the great scientist Galileo Galilee, but one of the four global satellite navigation systems. The Galileo system built by the European Union hangs.

According to the “Monitoring and Evaluation Center”, the Galileo system experienced a three-hour anomaly at 14-15 and 17:00 on July 10, 2019 UTC time (Beijing time, July 12, 22-23 and July 11, 01:00). The broadcast ephemeris of its satellite navigation signals has not been updated.

Part.1

What is a satellite navigation system?

The satellite navigation system, referred to as the GNSS system, is a group of 20,000 kilometers away from us. They don't emit light or heat, and even the naked eye can't observe them, providing us with location services.

There are a total of 4 VIP members in the satellite navigation system club, in addition to the European Union's Galileo system, the well-known US GPS system, including the Russian GLONASS system, and the Beidou satellite navigation and positioning system built by our country.

Part.2

It’s time to introduce you to the Beidou satellite navigation system.

The Beidou satellite navigation and positioning system consists of three parts: space segment, ground segment and user segment. It is a self-constructed and independent satellite navigation system in China. It provides global users with all-weather, all-day, high-precision positioning, navigation and timing. National critical space infrastructure for services.

According to Xinhua News Agency, the basic system of Beidou No. 3 has been completed. According to the plan, before October 2020, the Beidou 2 and Beidou 3 systems will provide services together; after October 2020, it will be said that Beidou is not only the Beidou of China, but also the Beidou of the world.

Xu Ying of the Institute of Optoelectronics of the Chinese Academy of Sciences said in the lecture hall of the SELF Institute of Chinese Academy of Sciences: "Since the birth of the Beidou system, it has been proven in many ways, accuracy and reliability, and does not lose the GPS navigation system. Perhaps you will ask: There is GPS, but what about Beidou? In fact, the GPS system is not as reliable as it is imagined. Because the GPS system is only open to us, the GPS code is easy to change when it comes to war. Autonomy, the EU has built the Galileo system. The same is true for us. To protect our reliability, the country began to build our own Beidou system."

Part.3

The application of Beidou is only you can't think of

The Beidou system not only provides functions such as location, navigation and timing, but also provides communication functions.

Professor Parkinson, the father of American GPS, once praised Beidou’s navigation and communication integration function: “It is a wonderful experience to know where you are and where I am.”

At present, Beidou has been widely used in transportation, marine fisheries, hydrological monitoring, weather forecasting, surveying and mapping geographic information, forest fire prevention, communication time system, power dispatching, disaster relief and disaster reduction, and emergency search and rescue.

Beidou Liang, China is strong!

China Beidou, embracing the world.

Source: “China Science Expo” public number (kepubolan)



Keywords : satellite navigation Beidou satellite

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European Galileo navigation system service disruption Satellite signal has not recovered


European Galileo navigation system service disruption Satellite signal has not recovered



504



[Text / Observer Network Zhao Noah]

Just having all the navigation functions, the EU's "Galileo" satellite navigation system is "hanging"...

The European Global Navigation Satellite System Bureau announced on the 11th that starting from 1st World Standard Time (UTC) on July 11th, users will experience service interruption of the "Galileo" satellite navigation system, the signal will be unavailable, and the specific recovery time is to be determined.

Official downgrade announcement on the 11th of the map from the European Global Navigation Satellite System Agency

As of 8:00 on July 12th, UTC time, the service of "Galileo" has not recovered. Monitoring data shows that this service interruption is indeed related to the broadcast ephemeris of satellite navigation signals.

The satellite industry's authoritative magazine "Inside GNSS" quoted the internal news of the European Global Navigation Satellite System Bureau on the 12th that the team is working hard to restore the "Galileo" service, which is expected to be completed on July 13-14 local time.

For this service interruption, observer network commentator Shi Wei said that in the critical moment when Galileo had all the navigation functions in 2019, such a major accident would undoubtedly dampen the market's confidence in the system.

"Service downgrade"

According to the announcement issued by the European Global Navigation Satellite System Agency on the 11th, the service interruption of the "Galileo" satellite navigation system began at 1 o'clock on the day of UTC. However, according to the 11th data of the "Global Continuous Monitoring and Evaluation Center" (iGMAS), "Galileo" has been abnormal since the UTC time from July 14th to 14th and 17th.

UTC time 10th 14th and 17th, "Galileo" broadcast ephemeris grayed out from iGMAS

iGMAS is one of the three major test systems clearly arranged in the "China's second-generation satellite navigation system major special implementation plan". It monitors and evaluates the operation status and main performance indicators of the four major satellite navigation systems in the world, and generates high-precision precision ephemeris. Information platform for products such as satellite clock differences, earth orientation parameters, tracking station coordinates and rates, and global ionospheric delay. The Monitoring and Evaluation Center is an important part of it.

On the 12th, the Monitoring and Evaluation Center stated in its official WeChat public account that after 21:50 UTC time on July 11, the "Galileo" system completely interrupted the service, and as of 8:00 UTC time on July 12, the service was still not restore.

UTC time starts at 22:00 on July 11th, all grayed out from iGMAS

In addition, the Monitoring and Evaluation Center said on the 12th that the iGMAS platform's full-day ephemeris data analysis on July 11 found that after the "Galileo" service was interrupted, the positioning performance decreased. By comparing the global comprehensive results before and after the interruption, it was found that the service performance in the horizontal direction decreased by 8% and the elevation direction decreased by 251% after the interruption of service, which further confirmed the performance degradation of "Galileo" service.

It can be clearly seen that after the "Galileo" interrupt service, there is a significant deviation in the positioning calculation results. Figure from iGMAS Monitoring and Evaluation Center

Is the reliability of "Galileo" worrying?

The "Galileo" positioning system is a satellite positioning system under construction. The system is built by the European Union through the European Space Agency and the European Navigation Satellite System Administration. It is one of the four major positioning systems in the world. Its purpose is to establish its own satellite in Europe. The navigation system is free from the reliance on the US "Global Positioning System" (GPS).

On August 21, 2011, Galileo launched its first satellite. The system plans to launch 30 satellites, which will be launched by 2020. In 2019, the "Galileo" system began to have full working capacity.

EU's "Galileo" positioning system from the European Space Agency

According to the iGMAS data, the service interruption of this "Galileo" occurred, and the broadcast ephemeris of its satellite navigation signals was not updated.

The broadcast ephemeris is determined and provided by the ground control part of the global positioning system. The radio signal transmitted by the positioning satellite carries the electronic message information of the number of satellite orbits predicted within a certain period of time, and the decoded satellite ephemeris is obtained by decoding. Location, the current broadcast ephemeris is mainly used for navigation positioning and low-level engineering measurements.

The broadcast ephemeris data was interrupted, indicating that all 24 existing satellites of the existing Galileo system have collapsed.

The accuracy of the satellite navigation system is based on accurate information such as its own orbit, time and other parameters, which will be broadcast to the user through the ephemeris. Therefore, after the failure of the "Galileo" system, the user cannot obtain the parameters of the satellite update, which also leads to a decrease in the accuracy of the navigation.

In addition, the navigation ephemeris is occasionally missing, and has little effect on the receiver in use, because expired ephemeris can be used, but if the missing time is long, the accuracy will diverge until it is unavailable.

For the data interruption of the "Galileo" system, observer network commentator Shi Wei said: "The Galileo system, as one of the four global navigation systems, originally planned to have all navigation functions in 2019, at this critical moment. The serious accident will undoubtedly plung the market confidence in this emerging navigation system, deepen concerns about its system reliability, and affect its future promotion and application prospects."



Keywords : Navigation Satellite China

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[Tony Tan]

https://insidegnss.com/galileo-interruptus/


Galileo Interruptus? Official Notice on 11 July Advises Users that Galileo Service is Degraded on All Satellites Until Further Notice
July 12, 2019
By Inside GNSS


Our source inside the European GNSS Agency (GSA), which is the EU agency responsible for Galileo services, has told us: “They are working on it. Teams from industry and the Agencies are working 24/7 to restore the Galileo services as soon as possible to their nominal levels. The current estimation is that the services should be restored within 48 hours. In any case, we expect the service to be again nominal before the end of the weekend [13-14 July 2019],” the source said.
At the time of this writing, downtime appears to be about 44 hours. Resumption of nominal service by the end of weekend 13-14 July would mean a total downtime of about 94 hours from the time of the original notice.
We’ll let the notice speak for itself—the message below currently appears on the GSA’s European GNSS Service Centre website (our emphasis).
Users will be hoping for the rapidest possible resumption of services along with a detailed explanation of what caused the crash. And it will be in the European Commission’s best interest to provide those answers ASAP.
NOTICE ADVISORY TO GALILEO USERS (NAGU) 2019025
DATE GENERATED (UTC): 2019-07-11 14:45
NAGU TYPE: GENERAL
NAGU NUMBER: 2019025
NAGU SUBJECT: SERVICE DEGRADATION
NAGU REFERENCED TO: N/A
START DATE EVENT (UTC): 2019-07-11 01:00
END DATE EVENT (UTC): N/A
SATELLITE AFFECTED: ALL
EVENT DESCRIPTION:
UNTIL FURTHER NOTICE, USERS MAY EXPERIENCE SERVICE DEGRADATION ON ALL GALILEO SATELLITES. THIS MEANS THAT THE SIGNALS MAY NOT BE AVAILABLE NOR MEET THE MINIMUM PERFORMANCE LEVELS DEFINED IN THE SERVICE DEFINITION DOCUMENTS AND SHOULD BE EMPLOYED AT USERS’ OWN RISK.
THE NOMINAL SERVICE WILL BE RESUMED AS SOON AS POSSIBLE.

 

[Tony Tan]

It is DEFUNCT for 3rd day already!

I checked again, no signal. May be dead for good.

 

[Hypocrite-The]

That just means yankeeland GPS is the bestest eventhough its the oldest,...hope the USA can upgrade to a betterer, cheaperer, fasterer system and give the ah tiongs and european ang mors a better run for its money

 

[syed putra]

Probably shot down by china.

 

[democracy my butt]

That just means yankeeland GPS is the bestest eventhough its the oldest,...hope the USA can upgrade to a betterer, cheaperer, fasterer system and give the ah tiongs and european ang mors a better run for its money

Wrong, it is gone case for Yankee too. Chinese & Russian jointly have the collaboration of BDS-3 + GLONASS integrated == WORLD BEST.

 

[Hypocrite-The]

Wrong, it is gone case for Yankee too. Chinese & Russian jointly have the collaboration of BDS-3 + GLONASS integrated == WORLD BEST.

If that is the case,,than yanks are fucked

 

[Tony Tan]

http://www.sohu.com/a/327024528_114986




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挑战GPS蒙阴影，地面设施故障导致伽利略全线“瘫痪”

2019-07-15 20:32

伽利略（Galileo）卫星导航系统上周五开始遇到大规模中断，至今仍未恢复。官方称导致故障的原因是位于意大利富齐诺的地面设施PTF（precise timing facility）设备发生了技术问题，目前仍在解决中。这也为伽利略今年具备完全操作能力的目标蒙上阴影。

有报道称，伽利略系统是因为缺少了一个叫“星间链路（Crosslink）”的技术，才会导致全系统掉线。星间链路将多颗卫星互联在一起，形成一个以卫星作为交换节点的空间通信网络，也就是说地面站被破坏了，卫星还能工作。伽利略系统没有这个技术，所以地面站一旦出现问题，卫星就无法自行运作。

在故障期间，汽车导航系统和手机用户将无法接受到时间和位置信息。他们可以使用美国的GPS系统作为替代，甚至是俄罗斯的格洛纳斯（Glonass）和中国的北斗系统。

自1978年发射以来，美国发展的GPS已经成为所有现代经济体运作的重要部分。但目前欧洲、俄罗斯和中国都已经拥有了GPS的替代卫星导航系统。中国耗资90亿美元打造的北斗导航系统也是为了减少智能手机和车载导航对美国GPS的依赖。

欧洲的卫星导航系统经过17年的发展，自主导航系统最早在2016年12月展开初始服务，是一个由欧盟和欧洲航天局耗资数十亿欧元打造、欧洲多国共同参与制造的全球卫星系统，共有24颗卫星组成，不过与最初30亿欧元的预算相比，伽利略全球导航系统的花费预计将达到最初的3倍。

欧盟委员会将伽利略推广为不仅仅是作为GPS的一项备用服务，而且定位更精准。伽利略系统可以提供实时定位服务，误差小于1米。有人说GPS定位到家的大楼，而伽利略定位到家门。

日内瓦大学教授尼古拉斯-吉森对第一财经记者表示，伽利略系统目前还在测试期，计划在2019年具备完全操作能力，因此这项耗资近百亿欧元的项目面临整个网络的瘫痪也令人担忧。除了目前22在轨运行的卫星，系统中还有2颗卫星正在测试中，另有12颗卫星在建。此外，伽利略还依靠复杂的地面基础设施来控制网络并监控其性能。

各国都将卫星导航系统视为事关经济发展命脉的技术。目前导航系统不仅仅能帮助人们在一个陌生的城市里找到路；该系统的定时功能现已在许多领域普遍存在，包括全球金融交易，远程通信和能源网络的同步。

2018年11月，美国联邦通讯委员会（FCC）决定允许美国用户和设备使用伽利略全球定位系统，这对全美用户手机定位功能的准确性有很大提高。此举被视为是在定位服务领域的放开。在此之前，美国用户被禁止使用除了GPS之外的导航系统。返回搜狐，查看更多


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Challenge GPS shadows, ground facilities failures lead to Galileo's entire line of "瘫痪"

2019-07-15 20:32


The Galileo satellite navigation system began to experience massive disruptions on Friday and has not recovered. The official said that the cause of the failure was a technical problem with the PFT (precise timing facility) equipment in Fuzzino, Italy, which is still being solved. This also casts a shadow over Galileo’s goal of full operational capability this year.


It has been reported that the Galileo system is due to the lack of a technology called "Crosslink", which will cause the whole system to drop. The inter-satellite link interconnects multiple satellites to form a space communication network with satellites as switching nodes, which means that the ground station is destroyed and the satellite can still work. The Galileo system does not have this technology, so if there is a problem with the ground station, the satellite will not be able to operate on its own.


During the breakdown, car navigation systems and mobile phone users will not be able to receive time and location information. They can use the US GPS system as an alternative, even Russia's Glonass and China's Beidou system.


Since its launch in 1978, the development of GPS in the United States has become an important part of the operation of all modern economies. But currently Europe, Russia and China already have GPS alternative satellite navigation systems. China's $9 billion Beidou navigation system is also designed to reduce the dependence of smartphones and car navigation on US GPS.


After 17 years of development in Europe's satellite navigation system, the autonomous navigation system was first launched in December 2016. It is a global satellite system built by the European Union and the European Space Agency and costing billions of euros. It consists of 24 satellites, but compared to the initial budget of 3 billion euros, the cost of Galileo's global navigation system is expected to triple.


The European Commission has promoted Galileo to be more than just a backup service for GPS, and it is more accurate. The Galileo system can provide real-time location services with an error of less than 1 meter. Some people say that GPS is positioned in the home building, and Galileo is positioned at home.


University of Geneva professor Nicholas Giessen told the First Financial Reporter that the Galileo system is still in beta and is planned to be fully operational in 2019, so the cost of the nearly one billion euro project facing the entire network is also worrying. In addition to the current 22 orbiting satellites, two more satellites are under test and another 12 satellites are under construction. In addition, Galileo relies on complex ground infrastructure to control the network and monitor its performance.


All countries regard satellite navigation systems as technologies that are related to the lifeblood of economic development. The current navigation system not only helps people find their way in a strange city; the timing function of the system is now ubiquitous in many fields, including global financial transactions, remote communication and energy network synchronization.


In November 2018, the US Federal Communications Commission (FCC) decided to allow US users and devices to use the Galileo Global Positioning System, which greatly improved the accuracy of the user's mobile phone location function. This move is seen as a liberalization in the field of location services. Prior to this, US users were prohibited from using navigation systems other than GPS. Go back to Sohu and see more




https://www.gpsworld.com/galileo-down-over-weekend/

Galileo down over weekend



July 14, 2019 - By Alan Cameron

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The entire Galileo system suffered an unexpected and hitherto unexplained signal outage, beginning on Thursday, July 11 at 1:00 pm Central European Time. At about that time, users noticed that all ephemeris stopped broadcasting, and then a Notice Advice to Galileo Users (NAGU) appeared:
NAGU Subject: Service Degradation
Satellite Affected: ALL

“Event Description: Until further notices, users may experience service degradation on all Galileo satellites.s this means that the signals may not be available nor meet the minimum performance levels defined in the service definition documents and should be employed at users’ own risk. The nominal service will be resumed as soon as possible.”



The signal outage has persisted for more than two days (as of Saturday) and as yet no word has emerged as to the cause or duration of the signal outage.



On the evening of July 13, a second NAGU appeared, saying simply that “Until further notice, users experience a service outage. the signals are not to be used.”


On the European GNSS Service Centre’s constellation status page, 22 Galileo satellites are listed as “Not Usable” with cause being “Service Outage.”


https://www.bbc.com/news/science-environment-48985399

Galileo sat-nav system still without service

By Jonathan Amos BBC Science Correspondent

• 15 July 2019

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Image copyright PA
Europe's satellite-navigation system, Galileo, remains offline.
The network suffered an outage on Friday due to what has been described as a "technical incident related to its ground infrastructure".
Engineers worked around the clock over the weekend but there is no update yet on when the service will resume.
The problem means all receivers, such as the latest smartphone models, will not be picking up any useable timing or positional information.
These devices will be relying instead on the data coming from the American Global Positioning System (GPS).
And depending on the sat-nav chip they have installed, cell phones and other devices might also be making connections with the Russian (Glonass) and Chinese (Beidou) networks.
Galileo is still in a roll-out, or pilot phase, meaning it would not yet be expected to lead critical applications.
"People should remember that we are still in the 'initial services' phase; we're not in full operation yet," a spokesperson for the European GNSS Agency (GSA) told BBC News.
"This is something that can happen while we build the robustness into the system. We have recovery and monitoring actions, and we are implementing them, and we are working 24/7 to fix this as soon as possible."

• Money released for 'UK sat-nav' study
• EC seeks to boost space spending
• QE Engineering Prize lauds GPS pioneers

The GSA issued a notification on Thursday warning users that Galileo's signals might become unreliable. An update was then sent out at 01:50 Central European Time on Friday to say that the service was out of use until further notice.
The search and rescue function on Galileo satellites that picks up the distress beacon messages from those at sea or up high mountains is said to be unaffected by the outage.
What is Galileo?

• A project of the European Commission and the European Space Agency
• 24 satellites constitute a full system but it will also have spares in orbit
• 24 spacecraft are in orbit today; two more will launch next year
• Original budget was €3bn but will now cost more than three times that
• Works alongside the US GPS, Chinese Beidou and Russian Glonass systems
• Promises eventual real-time positioning down to a metre or less

Galileo is a multi-billion-euro project of the European Union and the European Space Agency. The EU owns the system, and Esa acts as the technical and procurement agent.
There are currently 22 operational satellites in orbit (another two are in space but in testing), with a further 12 under construction with industry. In addition to the spacecraft, Galileo relies on a complex ground infrastructure to control the network and monitor its performance.
Europe's alternative to GPS went "live" with initial services in December 2016 after 17 years of development. The European Commission promotes Galileo as more than just a back-up service; it is touted also as being more accurate and more robust.
An outage across the entire network is therefore a matter of significant concern and no little embarrassment.
Since its launch in 1978, GPS has become integral to the functioning of all modern economies.
Usage goes far beyond just finding one's way through an unfamiliar city. The system's timing function has now become ubiquitous in many fields, including in the synchronisation of global financial transactions, telecommunications and energy networks.
[email protected] and follow me on Twitter: @BBCAmos

https://www.zdnet.com/article/europ...been-down-for-four-days-in-mysterious-outage/

EU's GPS satellites have been down for four days in mysterious outage

EU's Galileo global navigation satellite system nears 100 hours of downtime.



By Catalin Cimpanu | July 14, 2019 -- 21:52 GMT (05:52 GMT+08:00) | Topic: EU

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Galileo, the EU's global navigation satellite system, has been down for four days, since July 11, following a mysterious outage. All Galileo satellites are still non-operational, at the time of writing.
According to a service status page, 24 of the 26 Galileo satellites are listed as "not usable," while the other two are listing a status of "testing," which also means they're not ready for real-world usage.
The European GNSS Agency (GSA), the organization in charge of Galileo, has not published any information in regards to the root of the outage, which began four days ago, on Thursday, July 11.
On that day, the GSA published an advisory on its website alerting companies and government agencies employing the Galileo system that satellite signals have degraded and they "may not be available nor meet the minimum performance levels."
The agency warned that the Galileo system "should be employed at users' own risk."

The GSA published a more dire warning on Saturday, July 13, when it said that Galileo was experiencing a full-service outage and that "signals are not to be used."
At the time of writing, the service is nearing 100 hours of downtime.


The system going down forced the Galileo's userbase (government agencies and private companies) to switch to alternatives.
The Galileo satellite system was launched in 2016 and was funded by the EU as an alternative to the US Air Force's Global Position System (GPS) and the Russian government's GLONASS.
It is provided under both free and commercial offerings and is widely used by governments agencies and private companies for navigation and search and rescue operations.
Because it's provided for free, it is also widely used by the private tech sector and by most of the world's academia.
The downtime also comes after widespread GPS outages were reported across Israel, Iran, Iraq, and Syria at the end of June. Israeli media blamed the downtime on Russian interference, rather than a technical problem.
Updated on July 15, 5:30am ET: In a statement published after this article's publication, the GSA blamed the Galileo outage on "a technical incident related to its ground infrastructure." The agency said that the search and rescue (SAR) feature -- used for locating and helping people in distress situations for example at sea or mountains -- remained operational during the outage, which impacted only navigational and satellite-based timing services.


https://9to5mac.com/2019/07/15/galileo-down/

Europe’s GPS system Galileo down since Friday due to ‘technical incident’


Ben Lovejoy

- Jul. 15th 2019 5:40 am PT


@benlovejoy

4 Comments

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Galileo down: the European Union’s satellite navigation system has been down since Friday due to what has been described as “a technical incident.” Galileo signals can be used by the iPhone 8 and later and Android smartphones for mapping and other location services …







Signals from the European system can be used by a number of smartphones, with an outdated list available on the official website.
Location services and mapping shouldn’t be noticeably affected, as devices able to receive Galileo signals do so alongside the US GPS ones, and sometimes Russia’s GLONASS system and the Chinese Beidou service too. In the absence of Galileo, devices will simply fall back to the US system. However, as the European system is a more modern and precise service, position accuracy may be very slightly impacted with Galileo down.
The official statement doesn’t shed much light on the nature of the problem, stating only that the issue relates to ‘its ground infrastructure.’

Galileo, the EU’s satellite navigation system, is currently affected by a technical incident related to its ground infrastructure. The incident has led to a temporary interruption of the Galileo initial navigation and timing services, with the exception of the Galileo Search and Rescue (SAR) service. The SAR service – used for locating and helping people in distress situations for example at sea or mountains – is unaffected and remains operational […]
Experts are working to restore the situation as soon as possible. An Anomaly Review Board has been immediately set up to analyse the exact root cause and to implement recovery actions.​

The site reminds us that Galileo is officially still in its pilot phase, when glitches are to be expected. Currently, it has 22 operational satellites, two more in orbit but still in testing, and 12 more under construction.
The BBC points to a report claiming to have more details.

The specialist sat-nav publication Inside GNSS said sources were telling it that the problem lay with a fault at a Precise Timing Facility (PTF) in Italy. A PTF generates and curates the reference time against which all clocks in the Galileo system are checked and calibrated.​

There is no word yet on when service may be restored.

 

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伽利略系统全面“拉闸” 也许要从缺少这个技术说起

伽利略系统全面“拉闸” 也许要从缺少这个技术说起



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[文/ 观察者网专栏作者 石豪]
从北京时间2019年7月10日起，欧洲伽利略卫星导航系统开始出现数据中断等异常情况。
7月11日22时45分，欧洲GNSS服务中心发布公告，称伽利略系统所有卫星“服务降级”，导航信号可能不可用，正在尽快修复。
而就在7月14日凌晨4时15分，欧洲GNSS服务中心再次发布公告，宣布“用户服务中断”。
四大全球导航系统之一的伽利略，陷入全面“拉闸”状态。
罕见的故障
自1978年美国发射第一颗GPS卫星以来，人类对全球导航卫星系统（GNSS， Global Navigation Satellite System）的建设已经超过40年，形成了美国GPS、俄罗斯GLONASS、中国北斗和欧洲伽利略四大系统。虽然各系统的发展都不是一帆风顺，单星故障、服务不稳定等小毛病不算少，但像伽利略系统这次的全局服务中断故障，着实罕见。

四大全球导航系统的实时星下点位置，其中已无代表伽利略的绿色圆点 | 图片来源@国际GNSS监测评估系统

伽利略系统卫星工作状态，可见已全部掉线 |图片来源@国际GNSS监测评估系统
其实，从7月10日开始，由我国建设运行的国际GNSS监测评估系统（iGMAS）就已经记录到伽利略系统的信号异常：

7月10日伽利略系统卫星工作状态|图片来源@国际GNSS监测评估系统

7月11日伽利略系统卫星工作状态|图片来源@国际GNSS监测评估系统
从10日和11日的卫星工作状态图中我们不难发现，伽利略系统中的所有卫星都出现了步调一致的“掉线”，如果是卫星自身的问题，一般不会多颗星同时出现故障，并且故障发生时间完全一致，因此初步判断问题出在地面系统。
根据慕尼黑联邦国防军大学退休教授、前欧空局GNSS发展计划负责人Günter W。 Hein的说法，伽利略系统的故障是由位于意大利富齐诺控制中心的精密定时装置（PTF， Precise Timing Facility）引起的。
和其他全球定位系统一样，伽利略系统也由卫星和地面设备组成，建成后的伽利略系统将有30颗卫星在距地面2.3万千米的三个轨道面上运行。

伽利略系统星座示意图 | 图片来源@ESA
地面部分则由2个地面控制中心、6个测控站和多个数据上传站等组成，这次出现问题的精密定时装置就是属于富齐诺控制中心的地面任务段。
精密定时装置的核心是一个氢原子钟和多个铯钟，能够生成高精度、高稳定度的时间数据（伽利略系统时间GST），能够对星上时钟进行校准，以实现高精度定位。

精密定时装置（PTF）框图 | 图片来源@参考文献[2]
奇怪的沉默
在伽利略系统由信号异常到服务完全中断的过程中，由我国建设运行的国际GNSS监测评估系统（iGMAS）全程保持监测，并持续对国内外用户提供数据。
iGMAS是全球第一个涵盖四大导航系统的监测平台，也是我国第一个在联合国框架下发起并主导的科学工程。iGMAS的跟踪站遍布全球，包括8个国内站、14个海外站，甚至在北极的黄河站和南极的中山站也设有跟踪站，能够在全球范围内对四大导航系统的信号进行接收测量，对数据质量进行评估。全球用户可以通过iGMAS网站（www.igmas.org）获得免费的四大导航系统监测评估数据。

iGMAS南北极跟踪站 | 图片来源@iGMAS
根据一些专业GNSS网站的消息透露，工程师正在加班加点维修伽利略系统，预计服务将会在周末（7月13日到14日）恢复。
然而令人疑惑的是，在伽利略系统全面“拉闸”的几天里，公认的“西方主流媒体”并没有什么动静。
[作者注：在本文完稿后，直到北京时间7月15日早上7点，BBC终于报道了此事。从伽利略官方首次发布异常公告到BBC报道，超过80小时，即使从官方宣布全面“拉闸”算起，也隔了超过一天。实际上从北京时间7月12日5时50分起，伽利略系统已彻底中断服务，如果从这个时间点算起，“瞒报”时间近两天。]
也许是CNN、BBC等西方主流媒体对欧洲的全球导航系统宕机漠不关心？或者他们对欧洲的宽容度更高，选择为尊者讳？
只是不知道如果宕机的是中国的北斗系统，他们又会作何反应。
不过，想要北斗出现这种全系统掉线的情况，还真是有点困难的，这都源于一项北斗拥有，GPS也有，GLONASS都有，就伽利略没有的技术——星间链路。
缺少的技术
其实星间链路技术在北斗系统的应用，多少和历史有关。
全球导航系统包含数十颗卫星，卫星飞出国土范围后的测控很成问题——卫星上的遥测数据下不了，地面的遥控指令上不去。所以我们能看到远望号航天测控船队经常远航太平洋，为发射提供测控服务。

远望七号 | 图片来源见水印
对于英法美等老牌殖民主义国家而言，遍布全球的殖民地为设立测控站提供了诸多便捷，而我国建设的海外测控站则面临所在国政治局势的影响，始终存在风险。
20世纪90年代，我国在太平洋岛国基里巴斯建设了海外测控站，但2003年11月，基里巴斯当局背信弃义，与台湾当局建立所谓“外交关系”，基里巴斯测控站也遭受了重大挫折。
严峻的局势对北斗全球定位系统提出了更高的要求：北斗卫星不依赖境外测控站，就能完成对系统内卫星的测控。
而星间链路技术，是我们最好的选择。

星间链路示意图 | 图片来源@中国空间技术研究院
实际上，星间链路不光能传输数据，还能实现卫星之间的精密测距和校时，并以此自主计算并修正卫星的轨道位置和时钟系统。就算我国境内的地面站遭受攻击完全停止工作，依靠高精度的星间测距，北斗星座还能自主运行数月时间。
反观伽利略系统，因为没有星间链路，卫星只好“各自为战”，在地面站出现问题时，整个星座因为缺乏自主运行能力而陷入瘫痪，地面设施一天不恢复正常，伽利略系统也就一天不能重启，用户们也就要苦苦等待。
北斗卫星搭载的是Ka波段相控阵天线，相比于GPS搭载的UHF波段链路和GLONASS搭载的S波段链路，技术更先进，传输速率更快，同时对波束的指向性要求也更高。Ka波段星间链路技术的突破，不仅是北斗系统向世界顶级导航卫星系统迈进的重要一步，更为未来通信、导航、遥感一体化技术埋下了意味深长的伏笔。

通导遥一体化场景 | 图片来源@参考文献[5]
平心而论，以十几年前英法德意西欧国家的技术实力，完全可以做出比现在更好的导航系统，但伽利略系统从诞生之日起，就伴随着争吵与妥协，现在的样子只能算是各参与国的“最大公约数”。尽管到7月15日为止，西方主流媒体有意或无意地放过了这次事故，没有造成更大的舆论影响，但这次宕机对尚未完全建成的伽利略系统是否会带来消极影响，依然值得观察。
作为伽利略项目曾经的参与方与投资方，中国用北斗系统再次证明了自力更生在核心技术领域的重要性，有些东西是等不了、靠不住、要不来的。北斗系统的故事，值得我们细细品味，“北斗人”的精神，值得与每一位有志于为祖国突破尖端科技贡献力量的朋友共勉。

北斗卫星导航系统 | 图片来源@北斗系统官网

参考文献
[1] GALILEO positioning technology[M]。 Dordrecht， The Netherlands：： Springer， 2015。
[2] Zanello R， Mascarello M， Galleani L， et al。 The Galileo precise timing facility[C]//2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum。 IEEE， 2007： 458-462。
[3] 谢军， 王金刚。 北斗-3卫星的创新和技术特点[J]。 国际太空， 2017（11）：6-9。
[4] Zhou Y， Wang Y， Huang W， et al。 In-orbit performance assessment of BeiDou intersatellite link ranging[J]。 GPS Solutions， 2018， 22（4）： 119。
[5] 李德仁。 论军民深度融合的通导遥一体化空天信息实时智能服务系统[J]。 军民两用技术与产品， 2018（15）：14-17。


https://mil.news.sina.com.cn/world/2019-07-15/doc-ihytcerm3683106.shtml

欧洲伽利略导航系统问题多严重 目前已是瘫痪状态

2019年07月15日 09:32 环球时报



69

[环球时报报道 记者 涂蕾]欧洲全球导航卫星系统局日前发布服务降级公告称，从7月11日1时开始，用户将经历“伽利略”卫星导航系统的服务中断，服务将不可用，具体恢复时间待定。导航卫星行业权威杂志Inside GNSS12日援引欧洲全球导航卫星系统局内部消息称，团队正在全力恢复“伽利略”的服务，修复工作预计将在当地时间7月13-14日完成。该公告一出，迅速引起外界的广泛关注，号称全球四大卫星导航系统的“伽利略”系统到底怎么了？

有国内媒体在报道这一消息时使用了“‘伽利略’卫星导航系统‘挂’了”这样的提法。到底这次的事故有多严重呢？一位匿名的业内人士14日对《环球时报》记者表示，媒体所说的“挂”了是一种通俗的说法，也就是说系统目前“瘫痪”了。他认为，这次是件很严重的事件，是一次系统性中断，基本目前系统已经是瘫痪状态，卫星目前虽然还在发送信号，但由于导航电文长时间不再更新，用户无法进行导航定位。虽然“伽利略”系统目前还处于试运行状态，但也是第一次出现如此重大的问题。这对未来市场的信心有很大的冲击。
对于本次事故的原因，上述专家表示，根据一些国外专业媒体的说法是地面控制系统的严重故障导致。对于卫星本身是否出现故障，专家认为，目前公开消息有限，需要等后续官方发布更多消息。
那本次事故的后续影响有多大呢？北京北斗星通导航技术股份有限公司品牌总监李楠对《环球时报》记者表示，作为全球四大卫星导航系统之一“伽利略”系统出现严重故障而无法为用户提供服务，影响肯定是负面的。尤其是如果故障出现频次高、持续时间长，甚至会影响市场及用户对该卫星导航系统的信心。
他表示，目前在卫星导航民用应用领域，各大卫星导航系统已实现了兼容互操作，共同为全人类提供全天候、全天时的导航、定位、授时等服务。这恰恰就是为了帮助用户规避单一卫星导航系统出现故障而严重影响应用的情况。▲






Https://mil.news.sina.com.cn/2019-07-15/doc-ihytcerm3708948.shtml


The Galileo system is fully "brake-up". It may be necessary to start with the lack of this technology.


The Galileo system is fully "brake-up". It may be necessary to start with the lack of this technology.



293



[Text / Observer Network columnist Shi Hao]

From July 10, 2019, Beijing time, the European Galileo satellite navigation system began to have abnormalities such as data interruption.

At 22:45 on July 11, the European GNSS Service Center issued an announcement stating that all satellites in the Galileo system were "downgraded" and navigation signals may not be available and are being repaired as soon as possible.

At 4:15 on the morning of July 14, the European GNSS Service Center issued another announcement to announce "user service disruption."

Galileo, one of the four global navigation systems, is in a state of full “bringing”.

Rare failure

Since the launch of the first GPS satellite in the United States in 1978, humans have been building the Global Navigation Satellite System (GNSS) for more than 40 years, forming the four systems of US GPS, Russian GLONASS, China Beidou and European Galileo. Although the development of each system is not smooth, single-star failure, service instability and other small problems are not small, but the global service interruption failure of the Galileo system is rare.

The real-time sub-satellite point position of the four global navigation systems, which has no green dots representing Galileo | Image Source @国际GNSS Monitoring and Evaluation System
Galileo system satellite working status, it can be seen that all dropped lines | Image source @International GNSS monitoring and evaluation system Galileo system satellite working status, it can be seen that all dropped | Photo source @国际GNSS monitoring and evaluation system

In fact, starting from July 10th, the signal abnormality of the Galileo system has been recorded by the international GNSS monitoring and evaluation system (iGMAS) built and operated by China:
Galileo System Satellite Operation Status on July 10 | Image Source @国际GNSS Monitoring and Evaluation System July 10 Galileo System Satellite Operation Status | Image Source @国际GNSS Monitoring and Evaluation System
Galileo System Satellite Operation Status on July 11 | Image Source @国际GNSS Monitoring and Evaluation System July 11 Galileo System Satellite Operation Status | Picture Source @国际GNSS Monitoring and Evaluation System

From the satellite working state maps on the 10th and 11th, we can easily find that all the satellites in the Galileo system have a consistent "drop". If it is the satellite's own problem, there will not be multiple stars at the same time. And the fault occurred exactly the same time, so the initial judgment problem is in the ground system.

According to Günter W, retired professor at the Federal Defence Force University in Munich and former head of the GNSS Development Program at ESA. According to Hein, the failure of the Galileo system was caused by the Precision Timing Facility (PTF, Precise Timing Facility) at the Ficino Control Center in Italy.

Like other global positioning systems, the Galileo system is also composed of satellite and ground equipment. The completed Galileo system will have 30 satellites operating on three orbits of 23,000 km above the ground.
Galileo System Constellation Schematic | Image Source @ESA Galileo System Constellation Schematic | Image Source @ESA

The ground part is composed of two ground control centers, six measurement and control stations and multiple data uploading stations. The precise timing device that has this problem belongs to the ground task segment of the Ficino control center.

At the heart of the precision timing device is a hydrogen atomic clock and multiple cuckoo clocks that generate high-precision, high-stability time data (Galileo system time GST) that calibrates the on-board clock for high-precision positioning.
Precision Timing Device (PTF) Block Diagram | Image Source @Reference [2] Precision Timing Device (PTF) Block Diagram | Image Source @Reference [2]

Strange silence

In the process of the Galileo system from signal anomaly to complete service interruption, the international GNSS monitoring and evaluation system (iGMAS) constructed and operated by China maintains monitoring throughout the process and continues to provide data to users at home and abroad.

iGMAS is the world's first monitoring platform covering four navigation systems, and is the first scientific project initiated and led by China under the UN framework. iGMAS has tracking stations all over the world, including 8 domestic stations, 14 overseas stations, and even tracking stations at the Yellow River Station in the Arctic and Zhongshan Station in the Antarctic. It can receive and measure the signals of the four navigation systems on a global scale. , to assess the quality of the data. Global users can obtain free monitoring data for four navigation systems through the iGMAS website (www.igmas.org).
iGMAS South Arctic Tracking Station | Image Source @iGMASiGMAS South Arctic Tracking Station | Image Source @iGMAS

According to some professional GNSS website, engineers are working overtime to repair the Galileo system, and the service is expected to resume on the weekend (July 13 to 14).

However, it is puzzling that in the days when the Galileo system was fully "browsed", there was no movement in the recognized "Western mainstream media."

[Author's Note: After the completion of this article, until 7:00 am Beijing time on July 15, the BBC finally reported the matter. From Galileo's official announcement of the exception for the first time to the BBC report, more than 80 hours, even after the official announcement of a comprehensive "brake", it was more than one day. In fact, since 5:50 on July 12th, Beijing time, the Galileo system has completely interrupted the service. If we count from this point of time, the "reporting" time is nearly two days. ]

Perhaps the mainstream media in the West, such as CNN and BBC, are indifferent to the global navigation system in Europe. Or are they more tolerant of Europe, choose to be a sacred person?

Just don't know if the downtime is China's Beidou system, and they will react.

However, it is a bit difficult to find such a system-wide drop in Beidou. This is due to a Beidou possession, GPS, and GLONASS. The technology that Galileo does not have is the inter-satellite link.

Lack of technology

In fact, the application of inter-satellite link technology in the Beidou system is related to history.

The global navigation system contains dozens of satellites. The measurement and control of the satellites after flying out of the country is very problematic. The telemetry data on the satellites can't be done, and the remote command on the ground can't go up. Therefore, we can see that the space exploration and control fleet of Yuanwang often travels to the Pacific Ocean to provide measurement and control services for launch.
Yuanwang No.7 | Image source see watermark Yuanwang No.7 |

For the old colonial countries such as Britain, France and the United States, colonies all over the world provide many conveniences for setting up monitoring stations, and the overseas monitoring and control stations built in China are affected by the political situation in the host country, and there are always risks.

In the 1990s, China built an overseas monitoring and control station in the Pacific island country of Kiribati. However, in November 2003, the Kiribati authorities broke the trust and established a so-called "diplomatic relationship" with the Taiwan authorities. The Kiribati monitoring station also suffered major setbacks.

The severe situation puts forward higher requirements for the Beidou Global Positioning System: Beidou Satellite can complete the measurement and control of satellites in the system without relying on overseas monitoring and control stations.

The inter-satellite link technology is our best choice.
Schematic diagram of inter-satellite link | Image Source @中国空间技术研究院 Inter-satellite link diagram | Image Source @中国空间技术研究院

In fact, the inter-satellite link can not only transmit data, but also achieve precise ranging and timing between satellites, and automatically calculate and correct the satellite's orbital position and clock system. Even if the ground station in our country is completely stopped by the attack, relying on high-precision inter-satellite ranging, the Beidou constellation can still run for several months.

On the other hand, the Galileo system, because there is no inter-satellite link, the satellites have to "follow each other". When there is a problem at the ground station, the entire constellation is paralyzed because of the lack of autonomous operation capability. The ground facilities do not return to normal one day, and the Galileo system cannot Restart, users will have to wait.

The Beidou satellite is equipped with a Ka-band phased array antenna. Compared with the UHF band link carried by GPS and the S band link carried by GLONASS, the technology is more advanced, the transmission rate is faster, and the beam directivity requirement is higher. . The breakthrough of the Ka-band inter-satellite link technology is not only an important step for the Beidou system to move toward the world's top navigation satellite system, but also has a meaningful future for communication, navigation and remote sensing integration technologies.
Tongdao telescope integration scene | Image source @参考文章[5]Tongdao telephoto integration scene | Image source @参考文章[5]

In all fairness, with the technical strength of the British, French, German, and Western European countries more than a decade ago, it is possible to make a better navigation system than now, but since the day of its birth, the Galileo system has been accompanied by quarrels and compromises. The "largest common divisor" of the participating countries. Although the mainstream media in the West had intentionally or unintentionally let go of the accident until July 15, it did not cause a greater public opinion impact, but this downtime will have a negative impact on the Galileo system that has not yet been fully completed. Worth observing.

As a former participant and investor of the Galileo project, China's Beidou system once again proved the importance of self-reliance in the core technology field. Some things can't wait, can't stand, or come. The story of the Beidou system deserves our savory taste. The spirit of the "Beidou people" deserves to be shared with every friend who is interested in contributing to the breakthrough of cutting-edge science and technology in the motherland.
Beidou satellite navigation system | Image Source @北斗系统官网 Beidou Satellite Navigation System | Image Source @北斗系统官网

references

[1] GALILEO positioning technology [M]. Dordrecht, The Netherlands:: Springer, 2015.

[2] Zanello R, Mascarello M, Galleani L, et al. The Galileo precise timing facility [C]//2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum. IEEE, 2007: 458-462.

[3] Xie Jun, Wang Jingang. The innovation and technical characteristics of Beidou-3 satellite [J]. International Space, 2017 (11): 6-9.

[4] Zhou Y, Wang Y, Huang W, et al. In-orbit performance assessment of BeiDou intersatellite link ranging [J]. GPS Solutions, 2018, 22(4): 119.

[5] Li Deren. On the integration of military and civilian deep integration of navigation and integration of air and space information real-time intelligent service system [J]. Military and civilian dual-use technology and products, 2018 (15): 14-17.


Https://mil.news.sina.com.cn/world/2019-07-15/doc-ihytcerm3683106.shtml


How serious is the problem with the European Galileo navigation system?


July 15, 2019 09:32 Global Times



69



[Global Times reported reporter Tu Lei] The European Global Navigation Satellite System Bureau recently announced that the service downgrade announcement said that starting at 1 o'clock on July 11, users will experience the service interruption of the "Galileo" satellite navigation system, the service will be unavailable, the specific recovery Time to be determined. The GNSS authoritative magazine Inside GNSS quoted the internal report of the European GNSS Office as saying that the team is working hard to restore the "Galileo" service, which is expected to be completed on July 13-14. As soon as the announcement came out, it quickly attracted widespread attention. What happened to the Galileo system, the world's four major satellite navigation systems?

Some domestic media used the phrase “‘Galileo’ satellite navigation system ‘hanging’” when reporting this news. How serious is this accident? An anonymous industry insider told the Global Times reporter on the 14th that the media said that "hanging" is a popular saying, that is to say, the system is currently "squatting". He believes that this is a very serious incident. It is a systematic interruption. Basically, the current system is already in a state of paralysis. Although the satellite is still transmitting signals, the navigation message cannot be updated because the navigation message is not updated for a long time. Although the Galileo system is still in trial operation, it is the first such major problem. This has a great impact on the confidence of the future market.

For the reasons of this accident, the above experts said that according to some foreign professional media, it is caused by serious failure of the ground control system. Regarding whether the satellite itself has failed, experts believe that the current public news is limited, and it is necessary to wait for the official release of more news.

What is the subsequent impact of the accident? Li Nan, the brand director of Beijing Beidouxing Navigation Technology Co., Ltd., told the Global Times that as one of the world's four major satellite navigation systems, the "Galileo" system has experienced serious failures and cannot provide services to users, the impact is definitely negative. In particular, if the failure occurs frequently and lasts for a long time, it may even affect the market and users' confidence in the satellite navigation system.

He said that in the field of satellite navigation and civilian applications, major satellite navigation systems have achieved interoperability and interoperability to provide all-weather, all-day, all-day

 

[Tony Tan]

https://mil.news.sina.com.cn/jssd/2019-07-16/doc-ihytcitm2282278.shtml

欧洲24颗导航卫星突然失效 北斗:早知今日何必当初

2019年07月16日 08:42 新浪军事



4,637

据环球时报7月13日援引法新社的报道，近日，在全球卫星导航领域，中国大胜欧洲大败，上演了大逆转的一幕。欧洲全球导航卫星系统局发布了一则公告，称从上周四1点起，由欧盟建造的24颗伽利略卫星导航系统一度死机，关键时刻遭服务中断，信号不可用，恢复时间暂时还无法确定。

伽利略卫星发射
早年中国曾希望跟欧盟合作，发展GPS之外的第二套全球卫星定位导航系统，但欧洲认为中国技术不行狠狠拒绝了中国的要求。如今中国北斗三期工程进步巨大，卫星数量和导航精度，远远高于欧洲伽利略系统。而就在欧洲伽利略崩溃的同一天，中国的北斗导航系统却发布了一个重要消息。据西安卫星测控中心数据显示，北斗系统在轨运行的34颗卫星，状态良好，运行稳定，可正常提供高精度的导航服务。

北斗三号服务全球
据外媒报道，出现这一严重情况后，欧洲的研发团队试图尽快将该系统的服务功能进行修复，预计将于最近几天抢修完成，但截止到目前，还没有查清故障发生的具体原因，有可能在不久的未来，该系统还会出现比之前还要严重的事故。

欧洲官方部门发布公告
作为四大全球卫星导航系统之一，伽利略系统建造的初衷，就是想拥有欧洲自己的卫星导航系统，以此摆脱对于美国GPS系统的进一步依赖。目前，伽利略系统已成功发射了24颗卫星。但这次由于广播星历数据的中断，说明了该系统遭遇了一个十分严重的问题，即欧洲的24颗卫星在一瞬间全部宕机，而且没有任何的卫星备胎可用，同时也没有快速补网的能力。

北斗卫星定位系统
对此，有专家表示，这次的事故，让伽利略系统的可靠性遭受到了外界的怀疑。原本，该系统是打算在今年实现全部的导航功能，但半路却出现了这一严重事故，这无疑对国际市场以及未来的发展都将有所影响。

北斗三号
实际上，北斗与伽利略系统颇有渊源。最开始，在该技术领域，我国面临着一片空白，于是投入2.3亿欧元与欧盟在该项目上展开密切合作。但后期，在技术和待遇上，我国却遭到了无理由的排挤。无奈之下，我国退出了该项目并打算另起炉灶，自主研发自己的导航系统。后来，由于资金的问题，伽利略导航系统的组网进程十分缓慢。尽管我国起步较晚，且研发经验接近空白，但功夫不负有心人，经过反复的攻克难关，我国竟先于伽利略5年，成功的发射卫星升空。

中国成功发射第44颗北斗卫星
自从，中国退出项目后，欧洲也很快发现，伽利略项目的推进也变得举步维艰。我国后来居上，在2000年发射了两颗北斗导航试验卫星，而伽利略系统的首颗卫星，则是在8年前发射的。而如今，伽利略系统突然“挂了”，恢复时间待定，而中国的北斗系统却进展顺利，继续稳步的前行。

第二代“天琴”芯片
其实，欧洲已有不少专家为此后悔过。今年4月，中国成功发射了第44颗北斗卫星。紧接着，又有好消息传来，支持北斗三号全信号体制，第二代“天琴”芯片也正式发布了。今年，我国北斗导航已逐渐具备全球导航能力，将成为继GPS后的第二款全球导航产品。而如今面对伽利略系统遇到的大麻烦，也只能送上这八个字：早知今日何必当初。（作者署名：北方晨报国际）



The 24 navigation satellites in Europe suddenly failed. Beidou: Why did you know why today?
July 16, 2019 08:42 Sina Military
4,637

According to a report by the Global Times on July 13th, in the global satellite navigation field, China won a big defeat in Europe and staged a major reversal. The European Global Navigation Satellite System Bureau issued a notice saying that since 1 pm last Thursday, 24 Galileo satellite navigation systems built by the European Union have crashed, service interruptions at critical times, signals are unavailable, and recovery time is still uncertain. .
Galileo satellite launches Galileo satellite launch

In the early years, China had hoped to cooperate with the EU to develop a second global satellite positioning navigation system other than GPS, but Europe believed that Chinese technology could not refuse China's requirements. Today, China's Beidou Phase III project has made great progress, and the number of satellites and navigation accuracy is much higher than that of the European Galileo system. On the same day that Galileo collapsed in Europe, China’s Beidou navigation system released an important news. According to the data of Xi'an Satellite Monitoring and Control Center, the 34 satellites in operation of the Beidou system are in good condition and stable in operation, which can provide high-precision navigation services.
Beidou No.3 Service Global Beidou No.3 Service Global

According to foreign media reports, after this serious situation, the European R&D team tried to repair the service function of the system as soon as possible. It is expected that the repair will be completed in recent days, but as of now, the specific cause of the failure has not been ascertained. It is possible that in the near future, the system will have more serious accidents than before.
European official department issued an announcement issued by the European official department

As one of the four global satellite navigation systems, the original intention of the Galileo system was to have Europe's own satellite navigation system to get rid of further dependence on the US GPS system. Currently, the Galileo system has successfully launched 24 satellites. However, due to the interruption of the broadcast ephemeris data, the system encountered a very serious problem, that is, 24 satellites in Europe were all down in an instant, and no satellite spare tires were available, and there was no quick compensation. The ability of the network.
Beidou satellite positioning system Beidou satellite positioning system

In this regard, some experts said that the accident caused the reliability of the Galileo system to be suspected by the outside world. Originally, the system was intended to achieve all navigation functions this year, but this serious accident occurred halfway, which will undoubtedly affect the international market and future development.
Beidou No. 3 Beidou No.3

In fact, Beidou has a lot to do with the Galileo system. At the beginning, in this technical field, China faced a gap, so it invested 230 million euros to cooperate closely with the EU on the project. But in the later period, in terms of technology and treatment, China has been squeezed out without reason. In desperation, China withdrew from the project and plans to start a new stove and develop its own navigation system. Later, due to funding problems, the networking process of the Galileo navigation system was very slow. Although China started late, and the research and development experience is close to blank, but the hard work pays off, after repeated difficulties in tackling the difficulties, China actually launched Galileo for 5 years and successfully launched satellites.
China successfully launched the 44th Beidou satellite China successfully launched the 44th Beidou satellite

Since China’s withdrawal from the project, Europe has also quickly discovered that the advancement of the Galileo project has become difficult. China came to the fore. In 2000, two Beidou navigation test satellites were launched, and the first satellite of the Galileo system was launched eight years ago. Nowadays, the Galileo system suddenly "hangs", the recovery time is to be determined, and China's Beidou system is progressing smoothly and continues to move forward steadily.
The second generation of "Tianqin" chip second generation "Tianqin" chip

In fact, many experts in Europe have regretted this. In April this year, China successfully launched the 44th Beidou satellite. Then, there was good news coming, supporting the full signal system of Beidou No.3, and the second generation "Tianqin" chip was officially released. This year, China Beidou Navigation has gradually acquired global navigation capabilities, and will become the second global navigation product after GPS. Nowadays, in the face of the big troubles encountered by the Galileo system, we can only send these eight words: I know why today is the beginning. (Author's signature: Northern Morning News International)