Estimation of target distance based on fractional Fourier transform analysis of active sonar linear frequency modulation signals

Sungwoong Hyung; Myungho  Park; Soobok  Hwang; Keunsung Bae

doi:10.7776/ASK.2016.35.1.008

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Estimation of target distance based on fractional Fourier transform analysis of active sonar linear frequency modulation signals 능동소나 linear frequency modulation 신호의 fractional Fourier transform 분석에 기반한표적의 거리 추정

31 January 2016. pp. 8-15

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Abstract

As a generalized form of the conventional Fourier transform, fractional Fourier transform (FrFT) can analyze a signal at intermediate domain between time and frequency domains with a transform order . Especially, FrFT has a number of advantages in the analysis of LFM (Linear Frequency Modulation) signals due to its robustness to noise. In this paper, we have proposed a new method to detect and estimate the distance of the target from the FrFT spectrum of the received echo signal. Experimental results have validated the proposed method, and shown that reliable target distance could be estimated in noise and reverberation environments.

Keywords

FrFT

Time-frequency domain

LFM

Active sonar

Target detection

Fractional 푸리에 변환(Fractional Fourier Transform : FrFT)은 기존의 푸리에 변환의 일반화된 형태로서, 변환차수 에 따라 임의의 시간-주파수 영역에서의 신호해석이 가능하다. FrFT는 특히 LFM(Linear Frequency Modulation) 신호의 분석에 있어 잡음에 강한 특성으로 인해 많은 장점을 가진다. 본 논문에서는 능동소나에서 표적에 맞고 반향된 수신신호의 FrFT 스펙트럼으로부터 표적과의 거리를 추정하는 새로운 방법을 제안하였다. 합성한 표적신호를 통해 제안한 방법의 타당성을 검증하였으며, 실제 수중 실험을 통해 얻은 잡음 및 잔향 환경에서의 신호에서도 신뢰성 있는 표적과의 거리 추정이 가능함을 확인하였다.

키워드

FrFT

시간-주파수 영역

LFM

능동소나

표적탐지

References

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4.V. Katkovnik, “A new form of the Fourier transform for time-varying frequency estimation,” 1995 URSI International Symposium on. IEEE, 3, 179-182 (1995).

5.R. Jacob, A. Unnikrishnan, and T. Thomas, Development of Time-Frequency Techniques for Sonar Applications, (Ph.D. thesis, Cochin University, 2010).

6.J. W. Seok, T. H. Kim, and K. S. Bae, “LFM Signal Separation Using Fractional Fourier Transform” (in Korean), J. Korea Inst. Inf. Commun. Eng., 17, 540-545 (2013).

7.S. W. Hyung, K. S. Bae, S. B. Hwang, and M. H. Park, “Detection Method of LFM Signal Interval from Noisy Received Signal” (in Korean), 2015 IEIE Summer Conference, 2015, 525-526 (2015).

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 35
No :1
Pages :8-15
Received Date : 2015-10-08
Revised Date : 2015-11-06
Accepted Date : 2015-12-14
DOI :https://doi.org/10.7776/ASK.2016.35.1.008

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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