基于随机解调器的宽带雷达信号探测

Wideband radar signal detection based on random demodulator

压缩感知理论是一种新型的稀疏信号理论,其以远低于奈奎斯特速率的采样率对稀疏信号进行采样,并能完全重构原始信号为主要特征。在智能吸波系统中,准确并迅速地获得雷达信号是能够成功实现隐身的关键。基于压缩感知理论与随机解调器,设计了雷达信号频谱检测系统的硬件电路。实验结果表明,该系统可以以远低于奈奎斯特速率的采样速率准确获取原始信号的频谱信息。该方法解决了宽带雷达信号处理中数据量大、实时性差等问题,在雷达系统中具有广阔的发展前景及应用价值。

Compressed sensing is a new sparse signal theory,which can sample the signal with a sampling rate much lower than the Nyquist sampling rate,and can completely reconstruct the original signal.Successful stealth depends on quickly and accurately acquiring the frequency of the radar signal in a smart absorbing system.In this paper,the hardware circuit of the frequency detection system for radar signal is designed based on compressed sensing theory and random demodulator.Simulation results demonstrate that the system can accurately obtain the spectrum information of the original signal with a sampling rate much lower than the Nyquist rate.This proposed method solves the problems of large amount of data and poor real time ability in broadband radar signal processing,and has very broad prospect and practical application value in radar system.