一种有效的宽带数字侦察接收机信号检测方法

An Efficient Method of Signal Detection for Wideband Digital Reconnaissance Receiver

针对宽带数字式搜索接收机信号处理中的高分辨率谱估计和弱信号漏检问题,提出一种有效的处理方法。首先采用数字信道化接收机进行均匀窄带划分,并对各窄带信号进行FFT运算后拼接出整个接收带宽内的频谱,然后采用形态学滤波方法估计起伏的噪声基底并修正,最后根据修正频谱的噪声谱线的分布特征估计出自适应检测门限,并与修正频谱比较完成宽带接收信号的检测。理论分析和仿真试验验证了方法的有效性。

An efficient method is proposed for the realization of high resolution spectrum estimation and weak signals detection in broadband reconnaissance receiver.The broadband input signal is first divided into several equivalent narrow bands using digital channelized receiver,and the sub-band spectrums formed by FFT respectively is ranked to recompose the whole spectrum of the input signal.Noise floor is estimated by morphologic operation to correct the spectrum.Signal detection is performed by comparing the corrected spectrum line and the adaptive threshold estimated based on the distribution characteristic of the noise spectrum lines.Analysis and simulation results show the effectiveness of the proposed method.