扩频测控信号大动态信息高精度加载方法

Approach of Accurate Loading of High Dynamic Data for Spread Spectrum TT&C Signals

针对静态扩频测控信号的大动态信息加载问题,提出了一种基于数字化处理的高精度时域加载方法。该方法对测距扩频码采用"存储—内插—查表—抽取"的方式加入动态信息,对载波采用调整幅度变化的方式加入动态信息。最后对该方法进行综合仿真:即用高精度时域加载方法得到的载波信号重新调制测距扩频码,得到含有动态信息的数字信号。仿真分析表明,该方法能在不改变原始信号采样率的前提下,实现扩频测控信号大动态信息高精度加载。

A high accuracy time domain loading method based on DSP （Digital Signal Processing） is proposed to implement accurate loading of high dynamic data for spread spectrum TT＆C （Tracking, Telemetry and Command） signals. The method adopts ＂store-interpolate-table look-up-extract＂ approach to load dynamic data for spread spectrum codes and changes the range of amplitude variation to load dynamic data for the carrier wave. During comprehensive simulation, the carrier signals obtained with the high accuracy time domain loading method are used to remodulate the spread spectrum codes to get digital signals containing the dynamic data. Simulation results show that the proposed method successfully facilitates high accuracy loading of high dynamic data of spread spectrum TT＆C signals without changing the sampling rate of raw signal.