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International SLR Observation on COMPASS-G1,-I3,-I5 and -M3

Chen Juping(1), Zhang Haifeng(1), Wu Zhibo(1), Yang Huafeng(2), Zhang zhongping(1)

1. Shanghai Astronomical Observatory, CAS Shanghai, China 2. Beijing Global Information Center of Application and Exploitation, Beijing, China


Introduction
In the current list of satellites tracked by ILRS stations, the mission for GNSS include:
one GPS satellites four GALILEO satellites six GLONASS satellites one QZSS satellite four COMPASS satellites

COMPASS is the Chinese regional satellite navigation system, consisting of satellites with GEO, IGSO and MEO orbit and the orbital altitudes of 21500-36000km .


Introduction
COMPASS-M1, first experimental satellite launched in April 2007 for Chinese GNSS, started being tracked by ILRS stations since December, 2008. The comparison of the returned signal strengths from different GNSS satellites by the international observation campaign started from December 2008. The results presented on the International Laser Workshop on "SLR Tracking of GNSS Constellations" (Metsovo, Greece on September 14-19, 2009).



LRAs for COMPASS satellites
Designed by Shanghai Astronomical Observatory
MEO Size 31.6в28в3.0cm GEO/IGSO 49в43в3.0cm 33mm 90 770cm2 fused silica 0.5 4.85 kg

Diameter of corner cube 33mm Number of corner cube Reflective area Material Dihedral offset Weight 42 360cm2 fused silica 0.6 2.45 kg


In 2012, COMPASS-G1/-I3/-I5/-M3 become ILRS tracking satellites for precision orbit determination and microwave measuring technique calibration. And COMPASS-M1 stopped being tracked. Due to the COMPASS satellites orbit mode:
G1/-I3/-I5 can be tracked by stations in WPLTN and several in EUROLAS. M3 can be tracked by all ILRS stations.


The Observations of COMPASS satellites (May ­ August, 2012)
COMPASS-G1/-I3 began being observed from May 2012 and COMPASS-I5/-M3 from July 2012.

At the end of August, there are:
6 sites track COMPASS-G1 7 sites track COMPASS-I3 16 sites track COMPASS-M3


Passes of COMPASS-G1

Passes of COMPASS-I3


Passes of COMPASS-I5

Passes of COMPASS-M3


The following ones give the observations and the statistic of laser returns for COMPASS satellites by 1 kHz SLR system with laser power of about 1W at Shanghai Station.


COMPASS-G1 Average returns about 62 per one min


COMPASS-I3 Average returns about 98 per one min


COMPASS-I5 Average returns about 133 per one min


COMPASS-M3 Average returns about 158 per one min


Summary
he International SLR observation on Compass atellites provides the opportunity for the ones who re interested in researching on different kinds of NSS satellites. ope more sites which can track COMPASS atellites support the observations to COMPASS atellites. ery pleasured to communicate with ones at the ield of SLR observations and applications of GNSS


Thank for stations to track Compass satellites !