An Improved Prewhitening Method for LFM Reverberation in Shallow Sea Using Frequency Focusing Transformation

摘要

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 stationariN of reverberation is enhancecj, and the prewhitening performance of AR model is improved. Finally, experiments with real reverberation data verify that the proposed method improves the statistical detection probability of matched filter and GLRT detector by 6% and 11% respectively.