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为了满足火箭上面级测控下行信息量增大的特殊要求,借鉴等时性插入业务的思想设计了一种新的适应于上面级测控的信息帧格式。在此基础上,提出了这种帧格式下的跟踪方案,设计利用二阶环路滤波器累加支路输出辅助伪码跟踪环与位同步环的切换。根据推导出的比例因子,仿真了其性能。仿真结果表明,这种切换方式可以实现平滑过渡,性能良好。
In order to meet the special requirements of rocket upper level measurement and control downlink information increase, a new information frame format adapted to upper level measurement and control is designed based on the idea of isochronous insertion service. On this basis, this tracking scheme is proposed in this frame format, and the output of the secondary pseudo-code tracking loop and the bit synchronization loop are designed using the second-order loop filter accumulator branch output. According to the deduced scale factor, its performance is simulated. Simulation results show that this switching mode can achieve a smooth transition and good performance.