In the modern electronic warfare,increasingly complex electromagnetic environment puts forward higher requirements to the sensitivity of the reconnaissance system. It's difficult to detect and recognize the phase-modulated signal in the case of low SNR,so a two-stage uniform broadband digital channelized receiver is designed. The receiver improves the detection probability by accumulating the autocorrelation of amplitude,at the same time,the instantaneous self-correlation technique of phase accumulation is used to improve the recognition accuracy of the modulation type. Simulation results show that the two-stage channelized high efficient structure can improve the signal-to-noise ratio of about 17 dB,can adapt to the low SNR environment of -6 dB,whose recognition accuracy of the signal modulation type is not less than 90 %.%在现代电子战中,日益复杂的电磁环境对侦察系统的灵敏度提出了更高要求.针对低信噪比情况下调相信号检测困难与调制类型识别正确率低的问题,设计了一种两级宽带均匀数字信道化接收机.该接收机采用幅度自相关累加技术提高检测概率,同时采用相位累加瞬时自相关技术提高调相信号的调制类型识别正确率.仿真结果表明,该两级信道化高效结构信噪比增益约17 dB,能适应-6 dB的低信噪比环境,信号调制类型的识别正确率不低于90 %.
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