FFT处理方式下窄脉冲检测灵敏度损失量的计算

Detection Sensitivity Loss of Narrow Pulse by FFT

FFT是常用的数字信号处理方法,可以提高信号的检测信噪比。但窄脉冲信号由于并未充满完整的FFT帧,会带来额外的信噪比损失,进而导致接收机检测灵敏度的损失。经过详细分析和推导,得到了此情况下灵敏度损失的计算公式,为接收机分析窄脉冲检测灵敏度指标提供了依据。

FFT is a usual method of digital signal processing, which can improve detection signal -noise-ratio （SNR）. But because narrow pulse can not last the whole FFT frame, it will bring loss of SNR and loss of receiver system detection sensitivity. A formula of sensitivity loss under this situation is derived, which provides reference for receiver system detection sensitivity cacu- lation of narrow pulse.