VLBI tracking of highly elliptical orbit satellite with chinese domestic network

Details VLBI tracking of highly elliptical orbit satellite with chinese domestic network VLBI tracking of highly elliptical orbit satellite with chinese domestic network

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..239s&link_type=abstract

Acta Astronomica Sinica, vol. 48, no. 2, p.239-247

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Astrometry: Vlbi, Planets And Satellites: Individual, Method: Data Analysis

Scientific paper

VLBI technique has been playing an important role in the precise tracking of deep space probes in the past decades. As the China's furthest satellite launched to date with its 12Re apogee height, the Tance-1 satellite is a good candidate to demonstrate the potential application of VLBI technique for near-Earth space satellites tracking. With participation of Shanghai, Urumqi and Kunming stations, Chinese VLBI network (CVN) conducted an experiment to track the Tance-1 satellite for 2 sequential orbital periods in July 2004. After upgrade of Kunming station, MARK4 formatters and CVN hard disk recording systems, which developed by Shanghai Astronomical Observatory, have been adopted at all 3 stations during this experiment. Software cross-correlation programs were used for fringe check of satellite's telemetry signals and data cross-correlation. Based on weighted least square fringe-fitting algorithm, satellite VLBI delay and rate measurements were acquired. For 0.5s integration time, satellite VLBI delay precision is about 6ns and rate precision is about 2ps/s for Shanghai-Urumqi baseline, while the other 2 baselines have relatively larger measurement errors due to smaller antenna aperture of Kunming station. Three baselines closure test on satellite delay and rate measurements was carried out, which indicated that delay and rate closure errors were consistent with measurement errors. Stations clock offsets and instrumental delays were corrected by calibration of quasars observation and multiple tones Pcal signal extraction method. Corrected data have been applied for orbit determination of the Tance-1 satellite.

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