STUDY OF CHARACTER OF GPS/GLONASS SATELLITE CLOCK
CORRECTION BASED ON LEAST SQUARE SPECTRAL ANALYSIS
1）Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030
2）College of Surveying and Geo-informatics，Tongji University，Shanghai 200092
Abstract：Precise satellite clock corrections over 1 year provided by IGS are analyzed to find out the periodical character of satellite clock corrections.The modified Allan deviation（MDEV）of each GPS and GLONASS satellite is calculated to analyze the timefrequency stability and the type of noise in the atomic clock.Periodic character of satellite clock corrections and temporal variation of amplitude corresponding to each peak are analyzed in detail.Results show that：1）Spectral peaks are found on amplitude spectrum of GPS and GLONASS satellites with periods corresponding to 1 circle，1/2 circle，1/3 circle，1/4 circle of the satellite orbit period respectively while GPS’s peaks are clear and GLONASS’s are not；2）Removing the periodic signal，obvious changes are visible in the MDEV of GPS satellite clock corrections，but not in GLONASS.This indicates that the periodic signal is strong in GPS satellite clock corrections，but not in GLONASS；3）Comparisons of amplitude of satellite clock corrections over different time shows that variation of amplitude varies with time.
Yang Sainan,Chen Junping,Zhang Yize et al. STUDY OF CHARACTER OF GPS/GLONASS SATELLITE CLOCK
CORRECTION BASED ON LEAST SQUARE SPECTRAL ANALYSIS[J]. jgg, 2014, 34(2): 169-174.
