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考虑到传统的匹配场处理定位需要复杂的匹配声场计算,并对环境参数和声场模型有很高的依赖,为了克服这种缺点,采用虚拟接收方法对声源进行测距。首先对垂直阵接收到的引导声源和目标声源的信号进行相关处理,得到虚拟接收声场并估计虚拟接收声场干涉条纹的斜率,结合波导不变特征量β对目标声源进行测距。通过数值仿真和2004年南海实验数据处理,讨论了浅海斜坡海域环境中不同频段下利用虚拟接收方法对宽带声源测距的性能。随着频率升高,需要展宽频带以获得完整的干涉条纹和良好的测距结果。在实验数据处理中,选取频段较高的信号时,由于阵列间距偏大不能保证采样的简正波模式的正交归一特性,不能获得正确的测距结果。
Considering that traditional matching field processing and positioning require complicated matching sound field calculation and high reliance on environmental parameters and sound field models, in order to overcome this shortcoming, the virtual receiving method is used to perform sound source ranging. Firstly, the signals received by the vertical array are correlated with the signals of the target sound source to obtain the virtual receiving sound field and estimate the slope of the interference fringes of the virtual receiving sound field. The target sound source is measured with the waveguide invariant feature quantity β. By numerical simulation and experimental data processing in the South China Sea in 2004, the performance of wideband sound source ranging using virtual reception methods in different frequency bands in shallow sea slopes is discussed. As the frequency increases, the bandwidth needs to be broadened to obtain complete interference fringes and good ranging results. In the experimental data processing, when the signal with high frequency band is selected, the correct distance measurement result can not be obtained because the array spacing is too large to ensure the orthogonality of the sampled normal-wave mode.