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Active Sonar Target Detection Using Fractional Fourier Transform

Fractional 푸리에 변환을 이용한 능동소나 표적탐지

Baek, Jongdae;Seok, Jongwon;Bae, Keunsung
백종대;석종원;배건성

  • Received : 2015.09.30
  • Accepted : 2015.11.02
  • Published : 2016.01.31

Abstract

Many studies in detection and classification of the targets in the underwater environments have been conducted for military purposes, as well as for non-military purpose. Due to the complicated characteristics of underwater acoustic signal reflecting multipath environments and spatio-temporal varying characteristics, active sonar target detection technique has been considered as a difficult technique. In this paper, we describe the basic concept of Fractional Fourier transform and optimal transform order. Then we analyze the relationship between time-frequency characteristics of an LFM signal and its spectrum using Fractional Fourier transform. Based on the analysis results, we present active sonar target detection method. To verify the performance of proposed methods, we compared the results with conventional FFT-based matched filter. The experimental results demonstrate the superiority of the proposed method compared to the conventional method in the aspect of AUC(Area Under the ROC Curve).

Keywords

Active Sonar;Fractional Fourier Transform;Underwater Target;Detection;Time-frequency Characteristics

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Acknowledgement

Grant : BK21플러스

Supported by : 경북대학교