Sub-Optimum Detector Based on Reverbertion-Whiten in FrFT Field

• Published in: Applied Mechanics and Materials Vol. 577; no. Applied Decisions in Area of Mechanical Engineering and Industrial Manufacturing; pp. 810 - 815
• Main Author: Li, Zhen Gang
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.07.2014
• Subjects: Coherence; Detectors; Equivalence; Modulation; Noise; Signal detection; Statistics; Target detection; Chirp; FRFT; Reverberation; Signal Process
• ISBN: 9783038351559; 3038351555
• ISSN: 1660-9336; 1662-7482; 1662-7482
• DOI: 10.4028/www.scientific.net/AMM.577.810

Target detection in the presence of strong seabed reverberation is a hot research topic nowadays. This kind of target detection method is similar to signal detection with known shape and unknown parameters under non-WGN or coherent signal detection in reverberation. When a LFM signal is choose as transmitted signal, target echo has excellent time-frequency focusing property on a certain rotating angle and reverberation could lose its original linear modulation property. LFM signal can be transformed to a sine signal with some rank FrFT. Since FrFT is a linear transform, interference including reverberation and noise will keep former statistic characteristics. So LFM signal detection is thus equivalent to detection of sine signals in absence of colored noise. The reverberation will be easily erased and target echo will be preserved. Based on the analysis above all, a sub-optimum detector based on reverberation-whiten in FrFT field is advanced. The validity of these conclusions is validated by computer simulations. A satisfying result is achieved.