基于频率优化组合的KBR系统时标误差校正

时标误差是K波段精密测距仪(KBR)的一个重要测距误差源,现有的时标误差校正方法依赖于对星间时标偏差的精确测量。针对目前我国星间时标偏差测量精度不能满足校正需求的问题,提出了基于双频优化组合的时标误差校正方法,推导了优化频率之间应该满足的定量关系。研究了双频优化组合的实现,指出原有的KBR系统无法实现频率优化,在此基础上设计实现了一种改进频率流程的KBR系统,并对新的时标误差校正方法进行了实验验证。实验结果表明,基于双频优化组合的时标误差校正方法和改进的KBR系统有效降低了对星间时标偏差测量精度的要求。

A novel time-tag error correction method for KBR systembased on combination of optimal frequencies

Time-tag error is an important error source of K-band ranging (KBR) system, and present methods for time-tag error correction are depended upon accurate measurement of inter-satellite time-tag offset. Aiming at the problem that currently the national measurement accuracy of inter-satellite time-tag offset cannot satisfy the demand for time-tag error correction, a novel correction method based on combination of two optimal frequencies is proposed, and the quantity relation of the optimal frequencies is deduced. Research on the realization for combination of two optimal frequencies, which shows that it is unrealizable utilizing the existing KBR system, is performed. Consequently, a new KBR system adopting an advanced frequency flow is designed and realized. The experimental results demonstrate that the proposed method and the advanced KBR system effectively reduce the requirement for measurement accuracy of inter-satellite time-tag offset.