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European Galileo satellites fall for 6 days. This Chinese company built a “refuge ark” for 48 hours.

via:CnBeta     time:2019/7/20 9:30:32     readed:239

Prior to July 14, the European Global Navigation Satellite System Service Center issued an announcement that the initial navigation and timing service of the Galileo system was temporarily interrupted due to technical problems related to ground infrastructure. The fault began at 1:50 on July 12th at UTC (9:50 on the 12th Beijing time).


On July 16th, when the Galileo system failure occurred for 5 days, there was still no sign of recovery. The 22 employees of the Chihiro location launched a plan codenamed “Ark” to form a special attack team, and planned to “resurrect” the Galileo system.

At 19 o'clock on the evening of July 16, the "Ark Plan" team was assembled and began to fight overnight.


Several technical experts from the "Ark Plan" project team attacked

At 19 o'clock on July 18, as the result of the "Ark Plan", the "Ark 1" service was launched. The Chihiro location took only 48 hours to "help" the Galileo system to "restore" the broadcast ephemeris, which is equal to the application. Resurrected the Galileo system.

The technical expert explained that this technical failure is manifested in the fact that the broadcast satellite ephemeris does not update the broadcast. The so-called ephemeris refers to the satellite position and time information, and the broadcast ephemeris will be broadcast once every certain time interval. The broadcast ephemeris is monitored by the ground, injected into the satellite, and broadcast by satellite. In order to prevent orbital errors, all navigation systems need to update the broadcast ephemeris to determine the position of the satellite and locate it.

Relying on the Chihiro location, the national Beidou ground-based augmentation system “National One Network” and the Baishou Ground-based Augmentation Station, established in the world at Chihiro, have accumulated massive and high-quality satellite observation data of the Galileo system. These ground-based enhancement stations not only support the reception of Beidou positioning data, but also are compatible with positioning data supporting satellite navigation systems such as GPS, Galileo and GLONASS.


After the “Ark 1” was launched, the positioning effect of using the Chihiro position broadcast ephemeris (green) is basically the same as that of the Galileo system broadcast ephemeris (red).

Based on the above-mentioned massive Galileo observation data, the Chihiro position stably outputs the real-time high-precision Galileo satellite system precise orbit and clock difference, and then generates a standard format broadcast ephemeris through the ephemeris fitting algorithm.

At the same time, Chihiro's high-precision location service platform quickly completed the independent construction of Galileo Evangelical Broadcasting Service, which can provide Galileo system broadcast ephemeris data to users.

It is reported that the Chihiro location was established in August 2015. It was jointly established by China Ordnance Industry Group and Alibaba Group. Currently, more than 2,400 Beidou foundation reinforcement stations are built and operated nationwide. Based on the basic positioning data of Beidou satellite system (compatible with GPS, GLONASS, Galileo), the self-developed positioning algorithm is used to perform big data calculation through Internet technology, providing accurate positioning and extension services for users all over the country. (一鸣)

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