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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

Mission type	Navigation
COSPAR ID	2010-036A
SATCAT no.	36828
Mission duration	8 years
Spacecraft properties
Bus	DFH-3
Manufacturer	CAST
Start of mission
Launch date	31 July 2010, 21:30:04 (2010-07-31UTC21:30:04Z) UTC[1]
Rocket	Chang Zheng 3C
Launch site	Xichang LC-2
Orbital parameters
Reference system	Geocentric
Regime	Geosynchronous
Perigee altitude	35,653 kilometres (22,154 mi)
Apogee altitude	35,924 kilometres (22,322 mi)
Inclination	54.47 degrees
Period	23.93 hours
Epoch	25 December 2013, 12:35:30 UTC[2]

Compass-IGSO1 was launched at 21:30 GMT on 31 July 2010.[3] 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.

Instruments

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 on board 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[4]) and a single-photon avalanche diode based detector developed in cooperation with CTU.[5] The ground segment uses 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.

See also

• 2010 in spaceflight
• List of passive satellites

References

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