针对高精度低成本远距离时间比对的需求,设计了基于卫星共视原理的时间比对设备,改进了传统使用时间间隔测量钟差的方法,以外部10 MHz,1 pps为观测数据测量基准,开展了伪码精度、 时延稳定性、 超短基线、300 km基线试验验证工作.试验结果表明,基于GPS/BDS导航系统在300 km基线条件下能够实现优于1 ns的时间比对不确定度(A类),能够提供远距离的时间比对服务.“,”For high precision，low cost and long baseline Lime transfer requirement, the time transfer equipment base on the satellite common view principle is designed. The equipment improves the traditional method of using time interval to measure the clock difference. Using external 10 MHz and 1 pps as observation data measuring reference，the pseudo-code accuracy，time stability，ultra-short baseline，300 km baseline tests and verifications are conducted. The test results show that the navigation system based on the CPS/BDS under the condition of 300 km baseline can achieve better than 1 ns uncertainty (class A)，and can be used to provide time transfer service over long distance.