Synthetic aperture sonar area target high-speed simulation method based on bin scattering

Abstract

The invention provides a synthetic aperture sonar area target high-speed simulation method based on bin scattering, which comprises the following steps of: (1) setting the simulation parameters of a synthetic aperture sonar system and constructing an area target scene model; (2) determining the position of a basic matrix and determining irradiated states of the triangular bins of a characteristicarea target according to the time sequence of a sonar basic matrix in an azimuth direction; (3) for all completely irradiated triangular bins, calculating the frequency domain signals of the scattered fields of all irradiated triangular bins by using a Helmholtz-Kirchhoff integral formula obtained by simplification, and then carrying out superposition and inverse Fourier transform on the obtainedfrequency domain signals of the scattered fields of all irradiated triangular bins to obtain area target echo data which corresponds to the current position; and (4) repeating the step 2 to step 4 according to the sequence of the azimuth direction, thereby obtaining the frequency domain representation of an echo signal which corresponds to the position of the current basic matrix, and carrying out the inverse Fourier transform on the frequency domain signals to obtain complete echo data which corresponds to the area target.

Description

technical field [0001] The invention belongs to the field of sonar signal processing, in particular to a method for quickly simulating surface targets of synthetic aperture sonar based on surface element scattering. Background technique [0002] Synthetic Aperture Sonar (SAS) is an advanced high-resolution underwater acoustic imaging sonar. The nano-echoes are coherently processed to obtain high resolution in azimuth. [0003] The echo data simulation of surface targets is an important way to study the signal processing of synthetic aperture sonar. Using the simulated surface target echo data can verify the effectiveness of various SAS imaging algorithms, motion compensation and self-focusing algorithms. At the same time, it can also analyze system performance, which has a guiding role in the selection of system parameters. In addition, the identification of underwater targets is even more important. A large amount of data is required to build a target matching model. Alt...

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Problems solved by technology

[0005] The object of the present invention is to propose a method for fast simulation of synthetic aperture sonar surface targets based on bin scattering in order to overcome the shortcomings of low simulation accuracy caused by existing interpolation signal processing and bin shape selection

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