Research on the establishing scheme of local time standard

To test satellite navigation devices, the establishing scheme of local time standard steered by national time standard is proposed. The scheme establishes a GPS common-view time transfer system, traces the local atomic clock to UTC(NIM) by data comparison, determines which factors can influence the comparison accuracy, solves a predict equation, and ultimately implements the real-time value transfer. Experiments show that local time standard and national time standard synchronize within ±10 ns, and the accuracy and stability of local time standard are improved.