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导航卫星有效载荷信号生成链路组成部件的非理想特性不可避免会引起发射导航信号的失真,目前对于这种失真带来的信号测距性能损失并未有适用的解析模型;针对宽带双频复用信号的模拟失真,已有的仿真分析不够全面、有效。采用相关损耗、S曲线偏差、载波相位偏差作为评估指标,仿真评估了载荷模拟组件中HPA(High Power Amplifier,高功率放大器)前置滤波器、HPA、多路复用器(Output Multiplexer,OMUX)对Alt BOC、TD-Alt BOC、ACEBOC和Alt LOC不同调制方案测距性能的影响。其中对于HPA使用了有记忆HPA行为模型,考虑了不同HPA前置滤波器带宽和HPA工作点的影响,并评估了失真信号相对于理想信号在宽带导频和单边带导频两种跟踪方式下的性能损失。仿真结果和结论可以为信号调制方案比较评估、有效载荷信号生成链路的优化设计提供参考。
The non-ideal characteristics of the components of navigation satellite payload signal generation link inevitably lead to the distortion of transmitting navigation signals. At present, there is no suitable analytical model for the performance loss of signal ranging caused by such distortion. With the signal simulation distortion, the existing simulation analysis is not comprehensive enough, effective. The correlation loss, S-curve deviation and carrier phase deviation were used as evaluation indexes to simulate and evaluate the HPA (High Power Amplifier) pre-filter, HPA, OMUX (multiplex multiplexer) Impact on ranging performance of different modulation schemes for Alt BOC, TD-Alt BOC, ACEBOC and Alt LOC. The memory HPA behavior model was used for HPA, which considered the influence of different HPA prefilter bandwidth and HPA operating point, and evaluated two tracking methods of wideband pilot and single-sideband pilot with respect to the ideal signal Under the performance loss. The simulation results and conclusions can provide reference for the comparison and evaluation of signal modulation schemes and the optimization design of payload signal generation links.