Nyquist folding receiver(NYFR)can achieve wideband radar signal reception with a small number of devices,and measuring the waveform parameters of the received signal requires a correct estimation of the Nyquist zone(NZ)where the signal is located.Aiming at the current widely used linear frequency modulated(LFM)signal,the NZ estimation method based on time-frequency boundary fitting is optimized on the basis of analyzing the time-frequency graph of the LFM signal sampled by NYFR.The influence of the modulation coefficient and modulation frequency of the local oscillator signal in NYFR structure on the perform-ance of the proposed method is discussed,and the NYFR parameter selection strategy is given.The simulation results show that the optimized time-frequency boundary fitting method can achieve 100 correct detection probability when the signal-to-noise ratio is better than-9 dB.
关键词
侦察接收机/宽带信号处理/奈奎斯特折叠采样/奈奎斯特区估计/线性调频
Key words
reconnaissance receiver/wide-band signal processing/Nyquist fold sampling/Nyquist zone(NZ)estimation/linear frequency modulation(LFM)
维普
万方数据