新型压缩采样接收机及LPI信号截获识别技术研究

MWC compressed sampling receiver and subsequent LPI signal processing methods

针对传统宽带数字接收机在处理宽带雷达信号时采样数据量大、系统实现复杂,以及跨信道信号处理复杂的问题,使用一种基于调制宽带转换器(MWC)压缩采样(CS)的新型宽带数字接收机对宽带雷达信号进行截获、识别及参数估计。该接收机采用循环移位伪随机序列将接收信号混频至基带和其它子带内,经低通滤波及降速采样获得基带CS信号。进一步研究了基于CS信号的信号检测、识别技术。仿真试验证明了该方案的有效性。

Aiming at the large amounts of sampling data to be processed,complex hardware structure and cross-channel signal processing problems when processing wideband radar signals by using the conventional wideband digital receiver,a new wideband digital receiver based on the compressed sampling（CS）modulated wideband converter is used to intercept and recognize wideband radar signals,and complete the parameter estimation.The received signals are mixed to basebands and other sub-bands by the cyclic-shifted pseudo-random sequences.And then,the mixed signals are low-pass filtered and down-sampled to obtain the CS data.Furthermore,the signal detection and recognition methods based on CS data are studied.Finally,simulation results verify the effectiveness of the proposed scheme.