一种星间测距与时间同步的地面验证方法

A Ground Verification Scheme for Inter-satellite Ranging and Clock Synchronization of Formation Satellites

针对编队飞行卫星星间通信测距时间同步地面验证困难的问题,文章提出了一套系统的地面验证方法,包括有线测试和无线测试,能够系统充分地验证星间通信测距时间同步的静态和动态功能性能,适用于采用双向单程伪距原理进行测距的主从式多星星间测试。有线测试中通过信道模拟器和可调衰减器模拟星间远距离,可验证待测系统的静态性能,微波暗室无线测试、车载无线测试模拟星间相对运动,可验证待测系统的动态性能。龙江卫星的星间通信测距单机采用本地面试验方法进行验证,结果表明:提出的地面验证方法简单易行、误差可控,可用于组网卫星间的通信测距时间同步功能和性能验证,可为编队卫星星间通信测距时间同步功能和性能的地面验证提供参考。

As is known that ground verification of inter-satellite ranging is difficult to conduct,a systematic ground verification scheme for inter-satellite ranging of formation satellites is proposed in this paper.It is composed of wired tests and wireless tests,which is suitable for master-slave formation satellites adopting dual one-way ranging method.The wired tests are meant to verify the static characteristics while the wireless tests are meant to verify the dynamic characteristics of the system under test(SUT).In the wired ranging test,a satellite communication channel simulator and attenuators are used to simulate the long distance and SNR of the in-orbit status.In the wireless microwave anechoic chamber test and the vehicle wireless test,a vertical scanning shelf and a vehicle are used to simulate the dynamic motion of formation satellites.Ground tests of one SUT in Longjiang mission are carried out with these methods in this paper.Test data reveal the feasibility and effectiveness of the verification scheme,which will support the ground verification of further inter-satellite ranging missions.