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在动态的海洋环境中,由于数据向量和拷贝场之间的失配,匹配场处理器的性能会发生退化。数据向量的时间相关半径是这种退化的一种量度。通过2001年ASIAEX南海实验中垂直阵上水听器接收到的声场数据求取了400 Hz窄带信号的声场时间相关。从实验数据处理结果观察到,伴随着传播路径上非线性内波的进入,声场的时间相关半径减小。同时利用一个二维的平流冻结海洋模型和传播路径上三个温度链的温度数据对声场进行了数值仿真,分析了不同频率下的声场时间相关半径。结果表明:实验结果与仿真的400 Hz信号的声场时间相关较为一致。可见,在时变的海洋环境下,声信道中存在孤立子内波将会使声场的时间相关半径大大缩短。
In a dynamic marine environment, the performance of the matching field processor can degrade due to the mismatch between the data vector and the copy field. The time-dependent radius of the data vector is a measure of this degradation. The time-domain correlation of the 400 Hz narrow-band signal was obtained from the sound field data received by vertical hydrophone in the ASIAEX South China Sea experiment in 2001. From the results of experimental data processing, it is observed that the time-dependent radius of sound field decreases with the arrival of nonlinear internal waves in the propagation path. At the same time, the sound field is numerically simulated by a two-dimensional advection-freezing ocean model and the temperature data of the three temperature chains in the propagation path. The time-dependent radii of the sound field at different frequencies are analyzed. The results show that the experimental results are in good agreement with the simulated 400 Hz signals. It can be seen that in a time-varying ocean environment, the presence of solitary wave in the acoustic channel will greatly shorten the time-dependent radius of the sound field.