远海远域移动平台条件下GNSS卫星授时性能评估

相较于在陆地静止条件下的卫星授时性能，在远海远域的移动平台条件下更易受到可视卫星条件和空间电磁环境所带来的影响. 在东西伯利亚海域测试点、航行最北测试点、北冰洋返航点、白令海测试点、日本海测试点，利用高性能铯原子钟作为卫星接收机的参考外频标进行授时试验.从授时误差抖动、可视卫星数和频率准确度等方面分析了远海远域动态全球卫星导航系统(GNSS)多系统授时性能，试验结果可作为在北半球重要航道及极地海域测试区域授时性能评估的重要依据. 试验结果表明:所有测试点GNSS平均可视卫星数保持在10颗以上，单向授时时差抖动保持在±20 ns以内，输出频率准确度可达到10?13量级. 

Evaluation of GNSS satellite timing performance under far sea and far region mobile platform

Compared with the satellite timing performance under terrestrial stationary condition, it is more susceptible to the effects of visible satellite and space electromagnetic environment under the condition of mobile platform in the far sea and far region. This paper use high-performance cesium atomic clock as the reference external frequency standard for satellite receivers to perform timing tests at test points in the East Siberian sea, the northernmost test point, the Arctic Ocean return point, the Bering Sea test point, and the Japan Sea test point. Based on the number of satellites and frequency accuracy, the dynamic Global Navigation Satellite System (GNSS) multi-system timing performance of distant sea is analyzed. The test results can be used as an important basis for the timing performance evaluation of important waterways in the northern hemisphere and test areas in the polar seas. The test results show that the average number of visible satellites of the GNSS system at all test points is maintained at more than 10, the one-way time difference jitter is maintained within ±20 ns, and the output frequency accuracy can reach the magnitude of 10-13.