单通道时频重叠多信号处理技术进展与展望

复杂的电磁环境使得无线电侦察截获机接收到的信号时频重叠的情况时有发生,给信号分选和识别带来很大的困难。而阵列信号处理的方法不能直接移植到单通道时频重叠信号中,因此探求新的方法来解决此类问题,已经成为国内外研究的热点,有着广泛的应用前景。以通信对抗为应用背景,对现有的基于循环平稳的单通道时频重叠多信号参数估计和调制识别方法进行了总结,综述了现有的频移滤波器的方法和分离效果评价指标,指出了该技术发展面临的挑战和进一步的研究方向。

Development and Perspective of Co-Channel Time-Frequency Overlapped Multi-Signal Processing

With the greatly increasing complex and high-density electromagnetic environment,it occurs sometimes that the radio surveillance aircraft intercepts the time-frequency overlapped signals,and it brings a lot of difficulties to the signal sorting and modulation recognition.The algorithms based on array signal processing could not be replanted to multi-signals in co-channel.Exploring new methods to solve such a problem has become a hot issue in the worldwide,and has broad application prospects.In the background of communication countermeasures,the methods based on the cyclo-stationary of the parameter estimation and the modulation recognition are summarized,the overview of the existing frequencyshift filter methods and separation efficiency evaluation index are given,finally the challenges of the technology and the further research directions are pointed out.