基于前置解扩的短波3G-ALE信号解调性能研究

Research on demodulation performance of HF 3G-ALE signal based on pre-despreading

正确解调短波3G-ALE信号所携带的链路层协议信息,对于有效实施非合作通信对抗具有重要的意义。针对3G-ALE信号基于前置解扩的链路信息解调方法,重点分析研究了实际环境下存在的载频估计误差、信号同步误差对于解调性能的影响,并对解调性能进行了仿真实验。实验结果表明:相比基于后置解扩的解调方法,基于前置解扩的3G-ALE信号链路信息解调方法对于载频估计误差具有较好的鲁棒性,并且在一定信号同步误差范围内,低信噪比、低过采样率条件下的解调性能更优,因此更适用于非合作通信对抗的应用要求。

It is of great significance for effective implementation of non-cooperative communication countermeasure,resulting from correct demodulation of the link layer protocol information carried by HF 3 G-ALE signal.In the light of the link information demodulation method based on pre-despreading of 3 G-ALE signal,this thesis makes analysis and research especially on the effect on demodulation performance,which is from carrier frequency estimation error and signal synchronization error existing in actual environment,and the demodulation performance is carried on simulation experiment.The experiment results show that the link information demodulation method based on pre-despreading possesses better robustness to carrier frequency estimation error,compared with the demodulation method based on post-despreading of 3 G-ALE signal.And the demodulation performance is superior under the condition of low signal-to-noise ratio and low oversampling rate,within a certain range of signal synchronization error.Therefore,such demodulation method based on pre-despreading is more applicable for application requirement of non-cooperative communication countermeasure.