Echo simulation method considering directivities of receiving and transmitting array elements

Abstract

The invention discloses an echo simulation method considering directivities of receiving and transmitting array elements. The echo simulation method of the invention comprises steps of calculating accurate echo delay time between a point target and each receiving array element, performing time delay processing on an emission signal according to echo time delay time and a wide frequency band emission signal, calculating a side visual angle of a target opposite to the transmission array element according to a position of transmitting a wide frequency band signal by the transmission array element, calculating an amplitude of directivity of the transmission array element at a signal transmission moment according to the side visual angle of the target opposite to the transmission array element, calculating a side visual angle of a target opposite to the receiving array element according to the position of receiving an echo signal in the receiving array element, calculating the amplitude of the receiving array element directivity at the moment when the echo is received according to the side visual angle of the target opposite to the receiving array element and realizing amplitude weighting of a time delay transmission signal in a range direction frequency domain according to the amplitudes of the directivity of receiving and transmitting array elements. The echo simulation method considering directivity of receiving and transmitting array elements not only realizes verification on effectiveness of an imaging algorithm, but can help to design parameters of the SAS system to be researched.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to an echo simulation method considering the directivity of receiving and transmitting array elements. Background technique [0002] The performance of the multi-subarray synthetic aperture sonar system is inseparable from the signal simulation and processing technology. Multi-subarray echo is the basis of synthetic aperture imaging, which can be used in the simulation system to verify the effectiveness of the imaging algorithm and guide the parameter design of the synthetic aperture sonar system to be developed. The traditional echo simulation method regards the beam of the transceiver array element as a rectangle, and uses the frequency drift generated during the irradiation of the sonar 3dB (considering a single array element) beam to represent the Doppler bandwidth of the target along the azimuth direction. The beam modulation of yuan wide frequency band is seriously ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of ignoring the wide-band beam modulation of receiving and transmitting array elements during the simulation of traditional multi-subarray synthetic aperture sonar echo signals, and provide a multi-subarray synthetic aperture sonar that considers the influence of receiving and transmitting array elements on directivity. Nano-echo signal simulation method

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