GPS定时接收机的校准

Calibration of GPS Timing Receiver

GPS共视比对(GPS CV)是国际原子时进行时间连接的主要手段之一,即使在有TWSTFT(卫星双向时间频率传递)的实验室GPS也作为时间比对的备用手段而存在,而且TWSTFT系统启用时需用GPS做校准。国际权度局(BIPM)为了减小比对误差,对一些时间实验室的GPS接收机进行不定期校准。国家授时中心(NTSC)利用BIPM给出的校准报告对NTSC时间基准实验室的GPS定时型接收机的内部时延及相关数据进行修正,使UTC(NTSC)的准确度得到提高。

GPS CV time comparison is one of the most commonly used time transfer methods for TAI computation and it is also the backup technique for the timing laboratories which are equipped with TWSTFT system. BIPM has conducted GPS receiver round-trip calibrations at individual laboratories in order to reduce the comparison errors. The internal time delays of the GPS receivers of NTSC＇ s time standard laboratory and the relative data are corrected according to the BIPM round-trip calibration report so as to improve the accuracy of UTC（NTSC）.