摘要
针对卫星测控链路中大量使用的PM,BPSK,QPSK调制信号的实时识别问题,提出基于信号频谱特性的分类算法。首先在理论上分析PM信号的频谱特性、BPSK的二倍频频谱特性、QPSK二倍频和四倍频频谱特性,并用Matlab进行了仿真分析,得到与理论分析一致的结论;然后根据这三种信号的频谱特征探讨了实时识别的方法,并给出具体实现算法。用Matlab进行计算机仿真,其结果表明识别率较高,实际应用也证明此算法可行。
To investigate the real- time modulation recognition of PM, BPSK and QPSK signals widely used in Track, Telemetry and Control （TTC） of satellite links,an algorithm based on the spectrum feature is proposed. At first, the spectrum feature of PM,BPSK, QPSK signals, the square spectrum feature of BPSK, QPSK signals, the quadrature spectrum feature of QPSK signal in theory are analysed,and simulated with Matlab and the same results are gained. Then the method of real - time modulation recognition and an algorithm based on the spectrum feature of the three type signals are studied. The algorithm has a high rate of recognition according to the emulation of Matlab and is workable in practical application.
出处
《现代电子技术》
2009年第17期59-62,65,共5页
Modern Electronics Technique
