Ship radiated noise level measuring method based on virtual time reversal mirror

Abstract

The invention discloses a ship radiated noise level measuring method based on a virtual time reversal mirror. The ship radiated noise level measuring method comprises the following steps of: presetting ocean environmental parameters; calculating a channel transfer function and an impulse response function among a radiated sound source and measurement hydrophones; obtaining a received signal of each measurement hydrophone of a vertical array; carrying out virtual time reversal treatment on the received signal of the measurement hydrophone by the impulse response function; and carrying out summation treatment on an output signal of the received signal after virtual time reversal treatment of each measurement hydrophone so as to calculate ship radiated noise level. With the adoption of the ship radiated noise level measuring method, the influence on ship radiated noise measurement by distortion of a transmission signal caused by multipath and medium in a shallow sea can be eliminated or weakened so as to reduce measurement error.

Description

technical field [0001] The invention relates to a method for measuring radiation noise. Background technique [0002] As one of the most important underwater acoustic characteristics of ships, radiated noise occupies an important position in the fields of underwater acoustic detection, underwater acoustic countermeasures, target tracking and identification, etc. Its accurate measurement has great engineering application and military significance. However, in the process of radiated noise measurement, the influence of underwater acoustic channel on the measurement results is particularly prominent. [0003] Ship radiated noise is a typical broadband signal. During the measurement process, due to the multipath effect of the shallow seawater acoustic channel, the ship radiation noise signal received by the measuring hydrophone is superimposed by signals from different propagation paths, and the amplitude response and phase of the channel to different frequency signals The res...

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Problems solved by technology

However, these methods all approximate the measurement environment as a free field, without considering the influence of the measurement environment on the measurement results, and there are large errors between the obtained ship radiation noise characteristics and the real ship radiation noise characteristics (Wu Guoqing, Wang Meigang, Chen Shouhu et al. Error analysis and correction method for measuring radiated noise of underwater targets with vertical array and single hydrophone[J]. Acoustica Sinica. 2007; 32(5): 398-403.)

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