Phase shift beamformer with broadband frequency invariant null steering

Kyung-won Lee; Ji-hyun Lee; Dan-bi Ou; Hyung-in Ra; Ki-man Kim

doi:10.7776/ASK.2025.44.4.320

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2025 Vol.44, Issue 4 Preview Page Next Page

Research Article

Phase shift beamformer with broadband frequency invariant null steering 광대역 주파수 불변 널 조향을 갖는 위상 천이 빔 형성

31 July 2025. pp. 320-330

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Abstract

Null steering has been used primarily to improve the quality of a desired signal by minimizing or eliminating the effects of interfering signals. These algorithms select array weights such that nulls of lower gain are formed in certain directions within the beam pattern. However, the null orientations introduce null width error depending on the frequency within the band. This phenomenon causes the problem that when the desired signal and the interfering signal are located close together, the desired signal is also suppressed when the interfering signal is suppressed. This paper proposes a method to compensate the null width and null steering errors in broadband through weight vector design. Simulation and sea trial results show that the proposed method has a constant null width in the frequency band of interest than the existing narrowband null steering algorithm.

Keywords

Null steering

Frequency invariant

Broadband beamformer

Phase shift beamformer

Sea trial

널 조향은 주로 간섭 신호의 영향을 최소화하거나 제거하여 원하는 신호의 품질 향상을 위해 사용되어왔다. 이러한 알고리즘은 빔 패턴 내에서 특정 방향으로 이득이 낮은 널이 형성되도록 배열 가중치를 선택한다. 그러나 널 방향은 대역 내의 주파수에 따라 널 폭 오차가 발생하게 된다. 이러한 현상은 원하는 신호와 간섭 신호가 가깝게 위치할 때 간섭 신호 억제 시 원하는 신호도 억제되는 문제가 발생한다. 이 논문은 가중치 벡터 설계를 통해 광대역에서의 널 폭 및 널 조향 오차를 보상하는 방법을 제안한다. 모의실험과 해상 실험 결과는 제안한 방법이 기존의 협대역 널 조향 알고리즘보다 관심 주파수 대역에서 널 폭이 일정한 것을 확인하였다.

키워드

널 조향

주파수 불변

광대역 빔 형성

위상 천이 빔 형성

해상실험

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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 : 44
No :4
Pages :320-330
Received Date : 2025-02-05
Revised Date : 2025-03-18
Accepted Date : 2025-05-09
DOI :https://doi.org/10.7776/ASK.2025.44.4.320

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

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