Recursive filtering modulating method of transient broadband excitation signal of parametric array sonar
A broadband excitation and recursive filtering technology, applied in the re-radiation of sound waves, measurement devices, radio wave measurement systems, etc., can solve the problems of broadband signal distortion, difficult realization, divergence of integration results, etc., to reduce hardware costs and storage space. Small, initial value has little effect
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[0039] Using the method of the present invention to generate the excitation signal of the parameter array has carried out a large-scale pool test, and some experimental examples are shown here.
[0040] (1) The test signal is in the form of linear frequency modulation pulse, the start and stop frequency is 8kHz~10kHz, the pulse width is 1ms, and the carrier frequency is 85kHz. Pending signals such as figure 2 As shown, the excitation signal envelope obtained by the recursive filtering of the present invention is as follows image 3 As shown, the parametric array excitation signal modulated by the carrier is as follows Figure 4 As shown, the original wave signal received by the hydrophone after being transmitted by the parametric array system is as follows: Figure 5 , the self-demodulated secondary wave signal in water received by the hydrophone is as follows Figure 6 shown. Compare Figure 6 and figure 2 In addition to the change of the start and end stages of the tra...
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