Experiment of Onboard Laser Time Transfer(WSANE 2009 (Workshop for Space, Aeronautical and Navigational Electronics))

概要

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The LTT (Laser Time Transfer) payload onboard the Chinese experimental navigation satellite COMPASS-M1 with an orbital altitude of 21500km was launched on April 13, 2007. The payload included dual Single Photon Avalanche Diode (SPAD) detector, dual-timer based on Time Digital Converter (TDC) device, DSP and power supply with the total mass of 4.6kg and the power consumption of 18W. A Laser Retro-reflector Array (LRA) was installed on the satellite for accurate laser ranging purpose. The time transfer experiment at the Changchun SLR station has been performed during August 2007 and March 2008. The experiment has shown that the time and relative frequency differences between the ground hydrogen maser and the China-made space rubidium clocks have been obtained with the time precision of about 300ps for single measurement and the uncertainty of frequency difference measurement of about 3E-14 in 2000 seconds.
2009-10-26