利用辐射噪声对舰船进行定位

Localization of ship using radiated noise

针对具有弹性海底环境中舰船目标的定位问题,本文利用辐射噪声对舰船目标进行定位研究。在匹配场定位原理的基础上,定义海洋波导频谱峰值对应的频率与接收信号的频谱峰值对应的频率差值为代价函数,当代价函数值最小时即为目标声源的深度与距离。在典型声速剖面环境下,无论辐射噪声功率谱是单纯的连续谱或是连续谱叠加线谱,仿真结果表明:本文定位方法均能有效估计目标距离,当辐射噪声功率谱叠加线谱时会降低方法的定位精度,但可以通过增大使用频段范围弥补方法定位精度的下降。将所提定位方法应用到舟山获取的的实验数据中,能够有效对舰船目标进行定位估计。

Aiming at the positioning problem of target ship in environments with an elastic seabed,in this study,passive positioning for target ships is researched using the ship radiated noise.Based on the principle of matched field processing,the frequency difference between the frequency corresponding to the peak of the ocean waveguide spectrum and the peak of the spectrum of the received signal is defined as a cost function.When the cost function takes a minimum value,the depth and range of the ship can be obtained.In the typical sound velocity profile environment,whether the radiated noise power spectrum is a pure continuous spectrum or a continuous spectrum superimposed line spectrum,the simulation results show that the positioning method proposed in this paper can effectively estimate the target distance.When the radiated noise power spectrum superimposes the line spectrum,the positioning accuracy of the method will be reduced.The decrease in the positioning accuracy of the method can be compensated by increasing the frequency range.Applying the proposed positioning method to the experimental data obtained in Zhoushan can effectively estimate the positioning of the target ship.