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This paper presents an improved autoregressive (AR) prewhitening method for linear frequency modulation (LFM) reverberation in shallow sea to enhance the target signal. This method transforms the linear varying frequency in LFM reverberation to stationary frequency components using frequency focusing transformation, the local stationarity of reverberation is enhanced, and the prewhitening performance...
Based on the analysis of statistic characteristic of the instantaneous frequency sequence, a new type of robust signal detector was put forward, named Mean-Square-Error-of-Instantaneous-Frequency Detector (MSEIFD for short). The binary hypothesis testing mode of MSEIFD was indicated, and the property was analyzed by simulation and compared with that of matched filter (MF) in the same condition. The...
The task to analyze the statistic performance of the detectors based on the Fractional Fourier Transform (FRFT) is simplified via the way to research the statistic properties of the random variables located at the peak of the FRFT envelop and intensity. Their ROC curve and output SNR are obtained. It is shown that under great input SNR, the detection performance of this kind nonlinear detector is...
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