链路时延差对测控设备跟踪及解调性能影响分析

Analysis of Influence of Link Delay Differences on Tracking and Demodulation Performance of TT&C Equipment

针对无线电测控设备下行接收链路设备复杂、传输环节多带来的不同链路时延差异,对分集合成方式下数据解调及不同测控体制角误差解调的机理进行了简要介绍,在对航天测量船某测控设备出现的2起典型故障的实测数据进行仿真的基础上,详细分析了下行链路时延差对测控设备不同测控体制下的跟踪及数据解调性能的影响,提出了下行链路时延测试方法及存在时延差异时的应对措施,为测控设备研制时分析时延差异带来的影响提供理论依据。

In view of the different link delay differences caused by the complicated downlink receiving equipment and multiple transmission links in the radio TT&C equipment,the mechanisms of data demodulation in the mode of diversity synthesis and angular error demodulation in different TT&C systems are briefly introduced.Based on the simulation of the measured data of two typical faults happened in TT&C equipment in space TT&C ship,the influence of downlink delay differences on tracking and date demodulation performance under different TT&C systems is analyzed in detail.The method of time delay test for downlink and the countermeasures for delay difference are proposed.It provides theoretical basis for the analysis of the influence of delay differences in TT&C equipment development.