Title :
An improved prewhitening method for LFM reverberation in shallow sea using frequency focusing transformation
Author :
Ru-hang, Wang ; Jian-guo, Huang ; Yu-jie, Zhang
Author_Institution :
Coll. of Marine Eng., Northwestern Polytech. Univ., Xi´´an, China
Abstract :
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 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.
Keywords :
autoregressive processes; frequency modulation; matched filters; reverberation; sonar detection; sonar tracking; statistical analysis; target tracking; GLRT detector; LFM reverberation; autoregressive prewhitening method; frequency focusing transformation; linear frequency modulation reverbertion; linear varying frequency; matched filter; prewhitening performance; shallow sea; stationary frequency components; statistical detection probability; target signal; Detectors; Focusing; Frequency modulation; Reverberation; Signal to noise ratio; Sonar; autoregressive model; frequency focusing; prewhitening; reverberation; signal detection;
Conference_Titel :
Signal Processing Systems (ICSPS), 2010 2nd International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-4244-6892-8
Electronic_ISBN :
978-1-4244-6893-5
DOI :
10.1109/ICSPS.2010.5555388
