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针对多波束系统不能分辨波束宽度内目标方位的问题,提出了基于分裂波束和互功率谱方位估计方法的波束宽度内多目标判别方法.通过对目标声学亮点结构及多目标方位特征进行研究,分析了单目标和多目标回波信号之间的差异特征;采用对目标回波信号进行时域分割的方法,通过分析回波信号不同子帧间目标相位的变化规律,提出波束宽度内多目标的判别准则;在一定信噪比条件下,采用五个亮点的目标回波信号模型对所提方法进行了仿真验证.仿真结果验证了所提方法的有效性和正确性.
Aiming at the problem that the multi-beam system can not distinguish the target azimuth within the beamwidth, a multi-target identification method based on the method of beam splitting and cross-power spectrum azimuth estimation is proposed.Based on the study of target acoustic highlight structure and multi-target azimuth characteristics, The single-target and multi-target echo signals are compared. The method of time-domain segmentation of the target echo signal is used to analyze the variation of the target phase between different sub-frames of the echo signal. The criterion of discrimination is validated by using the five bright points of the target echo signal model under a certain SNR condition.The simulation results verify the effectiveness and correctness of the proposed method.