一种基于累加支路辅助的上面级跟踪切换方案

Scheme of upper-stage tracking switch based on accumulative branch

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 need of tracking a huge number （f data in the downlink of upper stage on rocket, a novel information frame format for upper stage was designed based on isoclLronous insertion. The tracking scheme in this frame for- mat was described as follows： the output of the accumulative branch on second-order loop filter is used to aid the switch be- tween Delay Locked Loop and Bit-synchronization Loop. The perforn ance of this scheme is simulated by Matlab based on the educed scaling factor. The simulation results illustrate that the switch cheme realized smooth transitions with high performance.