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中继卫星的天基测控是解决中低轨道航天器大范围、长时间、多目标测控的有效途径,但用户星到中继卫星的时延误差、多普勒频移校正误差等参数会对多目标测控带来干扰。针对该问题,首先分析了定位误差引起的时延误差、多普勒频移校正误差等因素,设计了天基多目标前向链路遥控SMA(S-band Multiple Access,S频段多址)信号形式和反向遥测链路SMA信号形式,选择与时延校正误差相匹配的LAS(Large Area Synchronous,大区域同步)码作为反向遥测信息的扩频码,建立了导航辅助的终端时延和频率预校正方案模型,可以有效消除多用户干扰。仿真表明,当Eb/N0≥10.5dB时,前向遥控信息误码率pe≤1×10~(-6),反向遥测信息误码率pe≤1×10~(-6),使用LAS码比Gold序列约有2dB性能改善,为基于我国天链卫星的中低轨道卫星稳定运行、载人航天交会对接以及后续空间站建设等任务的测控提供重要参考。
The satellite-based measurement and control of satellite is an effective way to solve the large-scale, long-term and multi-target measurement and control of medium and low orbit spacecraft. However, parameters such as delay error and Doppler shift error of user-to-relay satellite Multi-target measurement and control to bring interference. To solve this problem, firstly, the delay error caused by the positioning error, the error of Doppler shift correction and other factors are analyzed. The space-based multi-target forward link remote control SMA (S-band Multiple Access, S-band Multiple Access) Form and reverse telemetry link SMA signal form, select LAS (Large Area Synchronous) code matching the delay correction error as the spreading code of the reverse telemetry information, establish the navigation assistance terminal delay and Frequency pre-correction program model, you can effectively eliminate multi-user interference. The simulation shows that when Eb / N0≥10.5dB, the bit error rate of forward remote control pe≤1 × 10 ~ (-6) and the bit error rate of reverse telemetry pe≤1 × 10 ~ (-6) The code has an improvement of about 2dB compared with the Gold sequence, providing an important reference for the monitoring and control of the tasks of the low and middle or low orbit satellites based on China’s supersatellite, the manned space rendezvous and docking and subsequent space station construction.