|Start of mission|
|Launch date||31 July 2010|
|Rocket||Chang Zheng 3C|
|Launch site||Xichang LC-2|
Compass-IGSO1, also known as Beidou-2 IGSO1 is a Chinese navigation satellite which will become part of the Compass navigation system. It was launched in July 2010, and became the fifth Compass satellite to be launched after Compass-M1, G2, G1, and G3.
Compass-IGSO1 was launched at 21:30 GMT on 31 July 2010. The launch used a Long March 3A carrier rocket, flying from the Xichang Satellite Launch Centre. The satellite is developed in the basis of the DFH-3 satellite platform and has a lifespan of 8 years.
The primary instrument aboard Compass-IGSO1 is a navigation system operating in the L-band. Compass-IGSO1 is the second satellite of the Compass navigation system with an optical synchronization link. The timing functionality is provided by two instruments onboard the space segment, the Laser Time Transfer (LTT) instrument consisting of a corner-cube retroflector array (hexagonal shape 49 × 43 cm, 90 pcs, 33 mm diameter, 770 cm2 reflective area) and a single-photon avalanche diode based detector developed in cooperation with CTU. The ground segment is the dedicated Chinese satellite laser ranging network. The combination of traditional passive laser ranging with active single photon detection aboard produces data for the ground-to-space oscillator time-base with 10−11 s precision.
- "CZ-3A Chang Zheng-3A - BeiDou-2 IGSO-1 - 2010.Aug.01". Rui C. Barbosa. 2010-01-08. Retrieved 2011-01-06.
- "Laser Retro Reflective Arrays on the Compass Satellites". Chinese Academy of Sciences. 2008-10-17. Retrieved 2011-01-06.
- "Detektor vyvinutý na FJFI úspěšně pracuje už na druhé čínské družici" [Detector developed on FNSPE successfully operating on second Chinese satellite] (in Czech). Czech Technical University in Prague. 2011-01-02. Retrieved 2011-01-06.
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