GPS CV time comparison is one of the most commonly used time transfer methods for TAI compu- tation and it is also the backup technique for the timing laboratories which are equipped with TWSTFT system.

• 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。