Rapid simulation method of synthetic aperture sonar signal

Abstract

The invention provides a rapid simulation method of a synthetic aperture sonar signal based on a time delay table, comprising the following steps: (1) setting each simulation parameter of a synthetic aperture sonar system; (2) constructing a height model of a target scene needed to be simulated; (3) projecting the height information of each target point in an oblique distance direction; (4) counting the number of target points in all directions and distances; (5) calculating the delayed time of each ping of the target point corresponding to one synthetic aperture length according to the distance and constructing the time delay table; (6) calculating the basic matrix positions of different pings according to the given speed, performing time delay superposition to a sending signal accordingto the value of the time delay table, and finally obtaining an original echoed signal of the synthetic aperture sonar. The method can improve the computational efficiency of synthetic aperture sonar simulation signals and effectively perform echoed signal simulation of synthetic aperture sonar under the condition with more target points, in particular under the condition with a large-scale landform scene.

Description

technical field [0001] The invention relates to a sonar signal processing method, in particular to a method capable of quickly simulating synthetic aperture sonar echo signals. Background technique [0002] The synthetic aperture sonar (Synthetic Aperture Sonar: SAS) technology utilizes the movement of the small-sized matrix in the azimuth direction, and obtains high-precision sonar images through coherent processing of sonar echo signals at different positions. [0003] How synthetic aperture sonar works figure 1 As shown, the base array moves in a straight line at a constant speed, transmits and receives echo data at a certain time interval, and the data obtained by completing one transmission and reception is called a ping, and the received multi-ping data is subjected to synthetic aperture imaging processing to obtain high-resolution Two-dimensional image of the rate. The traditional simulation algorithm is to calculate the base array position (x, y, z) per ping accord...

AI Technical Summary

Problems solved by technology

However, when the number of target points is large, the amount of calculation increases rapidly.

Especially when simulating a continuous terrain scene, if you want to obtain as realistic simulation data as possible, you must divide the scene into as many target points as possible, so that the number of target points will reach the order of millions. Using traditional simulation Method is very slow when emulated

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