Method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics
A technology of working distance and passive sound, which is applied in ocean engineering, sonar, and underwater acoustic engineering
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[0060] Such as figure 1 As shown, the signal data analysis
[0061] The center frequency of the sound source emission signal is 335Hz, the data sampling rate is 1kHz, the -3dB bandwidth is approximately 30Hz, and a total of about 10 minutes of data is obtained. It is worth noting that the experimental data contains both signal and noise. The array element input signal-to-noise ratio is about 10dB. Since the narrowband problem is mainly concerned, the narrowband time-domain beamforming method can be used to analyze the receiving directivity response of the vertical line array to the long-distance sound source signal. Filter the received experimental data through a FIR bandpass filter with a passband of 333-337Hz to make it a narrowband signal. The signal covariance matrix is estimated by the average of 60s experimental data.
[0062] Such as figure 2 As shown in , the receiving directivity response of the sub-vertical receiving array to the long-distance sound source si...
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