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在浅海的工作环境下,船舶或海上作业平台的动力定位噪声严重地干扰全景扫描声呐的声图。目前的各种干扰抵消技术实际效果不理想,动力定位状态下其对全景扫描声呐的信号检测能力提高有限。本文具体计算了动力定位螺旋桨噪声干扰的直达波和海底反射波到达接收阵的入射角;仿真分析了接收阵入水深度对螺旋桨噪声干扰的直达波和多途影响,以及引起的盲区方位变化情况;提出通过收放全景扫描声呐的铠装电缆恢复被掩盖了的目标信号的方法,可提高全景扫描声呐的探测能力。系统仿真结果为全景扫描声呐设计者采取相应的信号处理算法来抑制动力定位噪声的干扰提供了依据。
Under the shallow sea working environment, dynamic positioning noise of ships or offshore work platforms seriously disturb the sound image of panoramic scanning sonar. At present, the actual effect of various interference cancellation technologies is not satisfactory. Therefore, the signal detection capability of the panoramic scanning sonar is limited to a limited extent under dynamic positioning. In this paper, the incident angles of the direct and sub-sea reflected waves arriving at the receiving array with the noise of the propeller are calculated. The influences of the depth of the receiving array on the direct noise and the multipath of the propeller noise are simulated and the changes of the azimuths of the blind spots are analyzed. The method of restoring the concealed target signal by the armored cable of the panoramic scanning sonar is proposed to improve the detection capability of the panoramic scanning sonar. The results of the system simulation provide the basis for the panoramic scan sonar designers to take corresponding signal processing algorithms to restrain the disturbance of dynamic positioning noise.