CAJ | 학술논문

声速是三点被动测距方法中影响距离解算精度的重要参数，当声呐系统的工作频率较高时，一般直接使用海水声速。但随着远距离探测声呐技术的发展，声呐工作频率越来越低。浅海波导中传播的低频声信号的相速度和群速度明显不同于海水声速，选取哪个声速项用于距离解算是一个值得研究的问题。通过理论分析与pekeris波导中的数值仿真，确定了三点被动测距解算公式中的速度项应为相速度。仿真结果表明选用简正波相速度用于距离解算能有效降低浅海低频时三点被动测距方法的误差。
성속시삼점피동측거방법중영향거리해산정도적중요삼수，당성눌계통적공작빈솔교고시，일반직접사용해수성속。단수착원거리탐측성눌기술적발전，성눌공작빈솔월래월저。천해파도중전파적저빈성신호적상속도화군속도명현불동우해수성속，선취나개성속항용우거리해산시일개치득연구적문제。통과이론분석여pekeris파도중적수치방진，학정료삼점피동측거해산공식중적속도항응위상속도。방진결과표명선용간정파상속도용우거리해산능유효강저천해저빈시삼점피동측거방법적오차。
The velocity parameter is an important parameter for the passive ranging of three-element array. When the sonar works at high frequency, the velocity parameter is usually set as the sound speed of water. With the sonar technology developing for the long range detection, sonar frequency is becoming much lower. Phase velocity and group velocity of low-frequency sound in shallow water are completely different from the sound speed of water. So, it is important for getting a higher ranging accuracy to determine which velocity should be chosen for passive ranging of three-element array. Theoretical analysis and simulation results in Pekeris waveguide show that the phase velocity should be used for passive ranging of three-element array at low frequency in shallow water, and it could improve the ranging accuracy effectively.