A method for setting coherent processing interval of continuous active sonar based on correlation of GSFM pulse

Hyeon-su Kim; Hyun-woo Kim; Won-oh Lee; Song-hwa Park; Jung-hoon Lee; Gyu-tae Park

doi:10.7776/ASK.2021.40.5.401

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2021 Vol.40, Issue 5 Next Page

Research Article

A method for setting coherent processing interval of continuous active sonar based on correlation of GSFM pulse GSFM 펄스의 상관도에 기반한 연속 송수신 소나의 신호처리 구간 설정 방법

30 September 2021. pp. 401-407

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Abstract

The continuous active sonar technology is effective for detecting and tracking targets because of short target revisiting rate. Generalized Sinusoidal Frequency Modulation (GSFM) pulses suitable for continuous active sonar systems are known to be capable of obtaining high time-bandwidth product while maintaining the orthogonality between pulses. However, it is unknown how to calculate an appropriate length of time to correlate received GSFM pulses in the presence of a target with acceleration. In this paper, we propose a method to calculate the appropriate time length based on the correlation when matching the received signal in the continuous active sonar system using GSFM pulse. The proposed method calculates the correlation according to the acceleration of the target and calculates the signal processing length according to the correlation. It is shown that stable detection performance can be obtained when the signal processing length calculated by the proposed method through the level of the sidelobe is applied.

Keywords

Continuous active sonar

Generalized Sinusoidal Frequency Modulation (GSFM)

Coherent processing interval

Active target detection

Active target tracking

연속 송수신 소나 기술은 표적 탐지 시간간격이 짧아 표적을 탐지하고 추적하는 데 효과적인 기술이다. 연속 송수신 소나 시스템에 적합한 Generalized Sinusoidal Frequency Modulation(GSFM)펄스는 펄스 간 직교성을 유지하면서 높은 시간-주파수 곱을 얻을 수 있는 것으로 알려져 있다. 그러나 가속도를 갖는 표적이 존재할 경우 수신된 GSFM 펄스를 상관처리하는 적정한 시간 길이를 산출하는 방법에 대해서는 알려진 바가 없다. 본 논문에서는 GSFM 펄스를 사용하는 연속 송수신 소나 시스템에서 수신신호를 정합처리할 때 적합한 시간 길이를 상관도에 근거하여 산출하는 방법을 제안한다. 제안된 방법은 표적의 가속도에 따른 상관도를 계산하고 상관도에 따른 신호처리 길이를 산출한다. 부엽의 준위를 통해 제안된 방법으로 산출된 신호처리 길이를 적용할 경우 안정적인 탐지 성능을 얻을 수 있음을 보인다.

키워드

연속 송수신 소나

Generalized Sinusoidal Frequency Modulation (GSFM)

상관 신호처리 간격

능동 표적 탐지

능동 표적 추적

References

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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 : 40
No :5
Pages :401-407
Received Date : 2021-05-31
Revised Date : 2021-07-06
Accepted Date : 2021-08-16
DOI :https://doi.org/10.7776/ASK.2021.40.5.401

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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