卫星双向时间比对的设备时延标定方法

卫星双向时间比对的设备时延包含在伪码测距的测量值之中,精确标定设备时延是提升卫星双向时间比对精度的关键。针对卫星双向时间比对中的设备时延标定问题,提出了一种基于同源零基线测量的设备时延标定方法,将中国科学院国家授时中心的1套3.7m天线地面站和2套5m天线地面站并址安装,3套地面站同时进行卫星双向时间比对模式的观测,以此来标定3套地面站之间的设备时延相对值。试验结果表明,该方法可使设备时延标定的精度达到亚ns量级,能有效减小设备时延对卫星双向时间比对精度的影响,对于多个地面站站间时间比对具有一定的实际意义。

A Calibration Method of Equipment Time Delay Based on Two-Way Satellite Time Comparison

In two-way satellite time comparison, equipment time delay is included in the measurement of pseudo-range, and the calibration accuracy of equipment time delay is the key to improve the accuracy of two-way satellite time comparison.To calibrate equipment time delay,we design a calibration method which is based on homologous to zero baseline measurement.A 3.7 m antenna ground station and two 5 m antenna ground stations of China National Time Service Center were installed at the same place, and the three ground stations observed a satellite at the same time based on the model of two-way satellite time comparison to calibrate the equipment relative time delay between the three ground stations.Results of the experiment show that the calibration accuracy of equipment time delay reaches a sub-nanosecond magnitude, the influence of the equipment time delay on two-way satellite time comparison is reduced effectively.It has a certain practical significance to the time comparison between multiple ground stations.