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2019 Vol.38, Issue 2 Preview Page

Research Article

Direction finding based on Radon transform in frequency-wavenumber domain with a sparse array

주파수-파수 스펙트럼과 라돈변환을 이용한 희소 배열 기반 방위추정 기법 연구

Yong Hwa Choi1∗
,
Dong Hyeon Kim2
,
J. S. Kim3∗
최 용화1∗
,
김 동현2
,
김 재수3∗
1한국해양대학교 수중운동체특화연구센터
2한국해양과학기술원-한국해양대학교 해양과학기술전문대학원
3한국해양대학교 해양공학과
∗Corresponding Author
31 March 2019. pp. 168-176
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Abstract

When an array receives a signal with a frequency higher than the design frequency, there is an ambiguity in beamforming due to spatial aliasing. In order to overcome this problem, Abadi proposed frequency-difference beamforming. However, there is a constraint that the minimum frequency bandwidth is required according to the value of the difference frequency. In this paper, we propose a method to find the direction of the target signal with spatial aliasing based on the frequency-wavenumber spectrum combined with Radon transform. The proposed method can estimate the direction of the target without ambiguities when the signal has nonnegligible bandwidth. We tested the algorithm by simulating a broadband signal and verified the results with the frequency-difference beamforming method using SAVEX15 (Shallow Water Acoustic Variability EXperiment 2015)’s shrimp noise data.

Keywords
Frequency-wavenumber spectrum
Sparse array
Radon transform
Frequency-difference beamforming

배열의 설계주파수보다 높은 주파수의 표적신호가 수신되는 경우 공간 에일리어싱에 의해 빔형성에 모호성이 발생한다. 이를 극복하기 위해 Abadi가 차주파수 빔형성 기법을 제안하였다. 하지만 차주파수 빔형성 기법은 차주파수의 값에 따라 최소한의 대역폭이 필요한 제약조건이 있다. 본 논문에서는 주파수-파수 스펙트럼의 특성과 라돈변환을 이용하여 공간 에일리어싱이 발생하는 표적신호의 방위를 추정하는 기법을 제안한다. 제안된 기법은 대역을 가지는 신호의 주파수 대역 내에서 방위추정의 모호성은 발생하지 않고, 표적의 방위를 추정할 수 있다. 하지만 대역을 가지는 신호에만 적용이 가능한 제약조건이 있다. 광대역 신호에 대해 시뮬레이션을 수행하여 알고리즘을 구현하고, 이를 SAVEX15 (Shallow Water Acoustic Variability EXperiment 2015)의 딱총새우 소음신호를 이용하여 차주파수 빔형성 기법의 결과와 비교 검증하였다.

키워드
주파수-파수 스펙트럼
희소 배열
라돈변환
차주파수 빔형성
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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 : 38
  • No :2
  • Pages :168-176
  • Received Date : 2018-11-06
  • Revised Date : 2019-01-08
  • Accepted Date : 2019-03-27
  • DOI :https://doi.org/10.7776/ASK.2019.38.2.168
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