• Title/Summary/Keyword: Bistatic sonar

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Comparison of Active Sonar Systems in Target Positioning Performance (능동 소나망의 표적 탐지 성능 비교)

  • 박치현;홍우영;고한석
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.159-162
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    • 2002
  • This paper deals with target positioning performance according to active sonar formation and measurement error. Generally, active sonar can be categorized into Monostatic, Bistatic and Multistatic cases and their error characteristics are different each other. In this paper, on the assumption that each receiver has two kinds of measurements; sum of distances, and a angle between receiver and target, we suggest least square(LS) method that combines the two measurements in Multistatic formation, and compare Multistatic case with Monostatic and Bistatic cases. Experimental results show that target positioning RMSE in Multistatic sonar is superior to those in Monostatic and Bistatic sonar by approximately 57%.

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Comparison of target classification accuracy according to the aspect angle and the bistatic angle in bistatic sonar (양상태 소나에서의 자세각과 양상태각에 따른 표적 식별 정확도 비교)

  • Choo, Yeon-Seong;Byun, Sung-Hoon;Choo, Youngmin;Choi, Giyung
    • The Journal of the Acoustical Society of Korea
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    • v.40 no.4
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    • pp.330-336
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    • 2021
  • In bistatic sonar operation, the scattering strength of a sonar target is characterized by the probe signal frequency, the aspect angle and the bistatic angle. Therefore, the target detection and identification performance of the bistatic sonar may vary depending on how the positions of the target, sound source, and receiver are changed during sonar operation. In this study, it was evaluated which variable is advantageous to change by comparing the target identification performance between the case of changing the aspect angle and the case of changing the bistatic angle during the operation. A scenario of identifying a hollow sphere and a cylinder was assumed, and performance was compared by classifying two targets with a support vector machine and comparing their accuracy using a finite element method-based acoustic scattering simulation. As a result of comparison, using the scattering strength defined by the frequency and the bistatic angle with the aspect angle fixed showed superior average classification accuracy. It means that moving the receiver to change the bistatic angle is more effective than moving the sound source to change the aspect angle for target identification.

Comparison of Active Sonar Target Positioning Performance and Optimal Sensor Arrangement (능동 소나 위치 추정 성능 비교 및 최적 수신망 배치)

  • 박치현;홍우영;고한석;김인익
    • The Journal of the Acoustical Society of Korea
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    • v.22 no.3
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    • pp.224-232
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    • 2003
  • In this paper, efficient deployment method of sensors and target positioning performance with respect to measurement error are dealt with. Active sonar can be categorized into Monostatic, Bistatic, Multistatic sonar, and characteristics of respective sonar are different. Assuming that each sensor can receive range and angular information, we compare the performance of Monostatic, Bistatic, and Multistatic systems. And we suggest Weighted least square (WLS) which gives the weight to former case, LS. In particular. adopting suggested method we investigate the target positioning performance according to number of sensor, distance from transmitter to receiver, and propose efficient arrangement rule for Multistatic sonar configurations. According to the experimental results, RMSE of Multistatic sonar is found to be superior to Monostatic and Bistatic by 35.98%. 37.45% respectively, and WLS is superior to LS approximately by 7.4% in average. Furthermore, as the difference of respective sensor's variance is large, it is observed that the improvement ratio of target positioning performance is increased.

Analysis of the range estimation error of a target in the asynchronous bistatic sonar (비동기 양상태 소나의 표적 거리 추정 오차 분석)

  • Jeong, Euicheol;Kim, Tae-Hwan
    • The Journal of the Acoustical Society of Korea
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    • v.39 no.3
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    • pp.163-169
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    • 2020
  • The asynchronous bistatic sonar needs to estimate direct blast arrival time at a receiver to localize targets, and therefore the direct blast arrival time estimation error could be added to target localization error in comparison with synchronous system. Direct blast especially appears as several peaks at the matched filter output by multipath, thus we compared the first peak detection technique and the maximum peak detection technique of those peaks for direct blast arrival time estimation through sea trial data. The test was performed in a shallow sea with bistatic sonar made up of spatially separated source and line array sensors. Line array sensors obtained the target signal which is generated from the echo repeater. As a result, the first peak detection technique is superior to maximum peak detection technique in direct blast arrival time estimation error. The result of this analysis will be used for further research of target tracking in the asynchronous bistatic sonar.

Source Information Estimation Using Enemy's Single-Ping and Underwater Geographic Information in Non-Cooperative Bistatic Sonar (비협동 양상태 소나에서 적함 송신기의 단일 능동 신호와 해저 지형 정보를 이용한 송신기 정보 추정)

  • Lee, Dong-Hwa;Nam, Jong-Geun;Jung, Tae-Jin;Lee, Kyun-Kyung
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.2
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    • pp.196-203
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    • 2010
  • The bistatic sonar operations using a spatially-separated source and receiver are classified into cooperative and non-cooperative operations. In the cooperative operation, an active signal of a friendly ship is used and the source information is known previously. In the non-cooperative operation, an active signal of the enemy is used and it is difficult to find out the source information. The source information consists of the range, speed, course and frequency of the source. It gives advantage to operating bistatic sonar. This paper suggests a method of estimating the source information with geographic information in the sea and the single-ping of the enemy. The source range is given using one geographic point. And the source speed, course and the frequency of the enemy's source signal are given using two geographic points. Finally, the validity of the scheme is confirmed through a simulation study.

A study on data association based on multiple model for improving target tracking performance in maneuvering interval in bistatic sonar environments (양상태 소나를 운용하는 자함이 기동하는 구간에서 추적성능향상을 위한 다수모델기반의 자료결합기법 연구)

  • Park, Seung-Hyo;Song, Taek-Lyul;Lee, Seung-Ho
    • The Journal of the Acoustical Society of Korea
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    • v.36 no.3
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    • pp.202-210
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    • 2017
  • For the target tracking in cluttered environment using a bistatic sonar whose transmitter and receiver are separately positioned, it is necessary to use data association algorithm via applying a proper measurement modelling to the bistatic sonar. The measurements obtained from the interval of ownship's maneuver have an increased error due to uncertainty of the position of transmitter and receiver. Using the measurements from this interval results in poor target tracking performance. In this paper, an improved tracking performance for the proposed data association based multiple model algorithm is validated by a monte carlo simulation.

Signal Synthesis Model for Active Sonar Performance Analysis (능동소나 성능분석을 위한 신호 합성 모델)

  • 이균경
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.683-686
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    • 1999
  • In this paper, we develop an active sonar signal synthesis model to analyze the detection performance of active sonar systems in a shallow water environment. Using this model, we synthesize the return signal of a bistatic sonar system at a typical operating frequency. This signal can be used to test proper active sonar signal processing techniques for real applications.

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Sonar detection performance analysis considering bistatic target strength (양상태 표적강도를 고려한 소나 탐지성능 분석)

  • Wonjun Yang;Dongwook Kim;Dae Hyeok Lee;Jee Woong Choi;Su-Uk Son
    • The Journal of the Acoustical Society of Korea
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    • v.43 no.3
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    • pp.305-313
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    • 2024
  • For effective bi-static sonar operation, detection performance analysis must be performed reflecting the characteristics of sound propagation due to the ocean environment and target information. However, previous studies analyzing bistatic sonar detection performance have either not considered the ocean environment and target characteristics or have been conducted using simplified approaches. Therefore, in this study, we compared and analyzed the bistatic detection performance in Yellow sea and Ulleung basin both with and without considering target characteristics. A numerical analysis model was used to derive an accurate bistatic target strength for the submarine-shaped target, and signal excess was calculated by reflecting the simulated target strength. As a result, significant changes in detection performance were observed depending on the source and receiver locations as well as the target strength.

Direct blast detection algorithm for asynchronous bistatic sonar systems (비동기 양상태 소나 시스템을 위한 직접파 탐지 기법)

  • Jeong, Euicheol;Ahn, Jae-Kyun;Kim, Juho
    • The Journal of the Acoustical Society of Korea
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    • v.37 no.3
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    • pp.139-146
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    • 2018
  • Monostatic sonar systems localize targets using the time information of pulse transmission and receipt. Whereas, in asynchronous bistatic sonar systems, receivers need to detect direct blast to localize targets, since a source doesn't share pulse information with receivers. In this paper, we propose a direct blast detection algorithm, which estimates PRI (Pulse Repetition Interval) of direct blast and adaptive thresholds. Experimental results show the proposed algorithm has robust direct blast detection performance in the environment where strong background noise and target signal exist.

A Study of Performance Characteristics for Active Sonar in Korean Shallow Seawater Temperature Structures (한국 천해 수온구조에서의 능동소나 성능 특성 연구)

  • Kim, Won-Ki;Bae, Ho Seuk;Son, Su-Uk;Hahn, Jooyeong;Park, Joung-Soo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.5
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    • pp.482-491
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    • 2021
  • It is obvious that understanding the effects of shallow water environment of Korea is very important to guarantee the optimal performance of active sonar such as monostatic and bistatic sonar. For this reason, in this paper, we analyzed the detection performance characteristics for various depth deployments of sonar in summer, winter and water temperature inversion environments, which environments are frequently observed in shallow water of Korea such as the Yellow sea. To analyze only effects of water temperature structures on target detection performance, we applied range independent conditions for bottom, sea surface and water temperature characteristics. To understand the characteristics of detection performance, we conducted transmission loss and signal excess modeling. From the results, we were able to confirm the characteristics of detection performance of active sonar. In addition, we verified that operation depth of transmitter and receiver affects the detection performance. Especially in the water temperature inversion environment, it was confirmed that the shadow zone could be minimized and the detection range could be increased through bistatic operation.