A self-focusing processing method for synthetic aperture sonar imaging

Abstract

The invention relates to an auto-focus processing method of a synthetic aperture sonar image, which mainly comprises the following steps: (1) obtaining width band analytic signal rp(t) by using complex baseband to demodulate each wave-return signal and matching wave-filtering process; (2) doing relevant process between adjacent wave-returning analytic signals; (3) obtaining the phase error estimation of the adjacent wave-returning analytic signals by computing the complex phase angle; (4) obtaining accumulation phase error caused by movement error by doing space location accumulation process; (5) using the phase error sequence {ªŠp} to do compensation to achieve wave-returning data adjustment; (6) Obtaining focus synthetic aperture sonar image by using the corresponding image reconstructing algorithm to the compensated data.

Description

technical field The invention relates to signal processing of synthetic aperture sonar imaging, mainly a self-focusing processing method of synthetic aperture sonar imaging, which is used to obtain more precise acoustic imaging of seabed landform surveying and sinking object detection. Background technique Synthetic Aperture Sonar (SAS for short) is a high-resolution acoustic imaging device. It uses a small-aperture matrix to move in a straight line at a uniform speed, successively transmits and receives signals during the movement, and coherently superimposes the received signals during a period of movement, so as to obtain an acoustic array equivalent to several times to dozens of times the actual physical sound array. Synthesize the virtual aperture array to obtain high resolution and space gain. However, this condition is not satisfied in the actual navigation process, which makes the synthetic aperture image produce intensity distortion ...

AI Technical Summary

Problems solved by technology

Because the sensor accuracy is difficult to meet the requirements of synthetic aperture sonar, synthetic aperture sonar generally needs to use self-focusing algorithm to realize motion error compensation

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