直扩/跳频混合扩频信号测量性能分析

Telemetry Performance Analysis of DS/FH Hybrid Spread Spectrum Signal

从模糊函数角度,研究了直扩/跳频(DS/FH)混合扩频信号的测距、测速性能。推导了DS/FH混合扩频信号的模糊函数表达式。由数值仿真得到一个跳频点内传递一个直扩伪码周期的混合扩频信号模糊图。仿真分析结果表明,DS/FH混合扩频信号具有良好的测距测速性能,从而论证了该信号用于跟踪测量的可行性。最后,根据信号估计理论分析了直扩/跳频混合扩频信号精度。

The telemetry and velocity measuring performance for DS/FH hybrid spread spectrum signal is discussed based on ambiguity function. Ambiguity function expression of DS/FH hybrid spread spectrum signal is derived. According to the numeric simulation, the ambiguity plots of DS/FH signal can be found. The simulation result is that DS/FH hybrid spread-spectrum signal has better ambiguity properties than DS spread spectrum signal, so the feasibility of DS/FH signal for tracking and telemetry is demonstrated. Finally, the pseudocode ranging and velocity, mesuring error of DS/FH hybrid spread spectrum signal is analysed based on the signal estimation theory.