扩频体制卫星抗干扰性能分析

Analysis on Anti-Interference Performance of DSSS Satellite Signal

针对扩频体制卫星跟踪过程中出现的干扰问题,从伪随机码调制入手,分析伪随机码调制的直接序列扩频信号的自相关函数和功率谱,讨论直接序列扩频信号的抗干扰性能,给出比较详细的理论推导并进行仿真验证,对仿真结果作进一步分析。仿真结果表明,在码型和码长相同的条件下,不同伪码间的互相关值越低,信号间的干扰越小;同时,提高伪码速率,能够有效提高信号的抗干扰能力。

DSSS（Direct Sequence Spread Spectrum）signal has many performance advantages but can still be interfered in reception such as in satellite tracking. This paper analyzes the PRN（Pseudo Random Noise） code modulation, ACF（Auto Correlation Function） and PSD （Power Density Spectrum） of DSSS signal,deduces the theoretical formulas and presents the simulation result. The result shows that,with the same Gold PRN code length, if the CCF（Cross Correlation Function） is lower, the interference is less; and higher rate of PRN code can effectively improve the anti-interference capability of DSSS signal.