Synthetic aperture sonar motion compensation method for reducing accumulated error of DPC (Displaced Phase Center) method

A technology of synthetic aperture and cumulative error, which is applied in the direction of sound wave re-radiation, re-radiation, and measuring devices, can solve the problems of large cumulative error, limited precision, failure, etc., to reduce the problem of error accumulation, improve accuracy and The effect of robustness

Active Publication Date: 2017-11-21
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

Underwater navigation equipment generally has limited accuracy or is extremely expensive. In practice, motion compensation based on echo data is generally given priority
The typical motion error estimation method based on echo data is the phase center overlapping method (D

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  • Synthetic aperture sonar motion compensation method for reducing accumulated error of DPC (Displaced Phase Center) method
  • Synthetic aperture sonar motion compensation method for reducing accumulated error of DPC (Displaced Phase Center) method
  • Synthetic aperture sonar motion compensation method for reducing accumulated error of DPC (Displaced Phase Center) method

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Embodiment Construction

[0040] The present invention will be further described now in conjunction with accompanying drawing.

[0041] The synthetic aperture sonar motion compensation method of the present invention comprises the following steps:

[0042] Step 1), the synthetic aperture sonar receives echo signals, performs aperture division on the azimuth synthetic aperture within a complete synthetic aperture length, and obtains multiple sub-apertures, each sub-aperture contains several ping echo signals;

[0043] In this step, when dividing the sub-aperture, the size of the divided sub-aperture (that is, how many ping echoes are included in the sub-aperture) determines the resolution of the sub-aperture image, and the resolution of the sub-aperture image will affect the estimation accuracy. When the resolution of the image is too low, part of the error may be caused by insufficient resolution; when the resolution is too high, the image area is too small, and sometimes it is not possible to find sca...

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Abstract

The invention discloses a synthetic aperture sonar motion compensation method for reducing the accumulated error of a DPC (Displaced Phase Center) method, which comprises the steps of receiving echo signals by synthetic aperture sonar, performing aperture division on an azimuth synthetic aperture within a complete synthetic aperture length to obtain a plurality of sub-apertures, wherein each sub-aperture contains a plurality of echo signals; performing motion error estimation and compensation on inter-ping echo signals by adopting the DPC method in the sub-apertures; and estimating and compensating a motion error between the sub-apertures in a correlation manner according to sub-aperture image data between the sub-apertures, wherein the step further comprises the sub-steps of solving matching points of sub-aperture images, performing error estimation and compensation based on the matching points and compensating the estimated error into the original echo data or using the estimated error for correcting an imaging grid.

Description

technical field [0001] The invention relates to a sonar motion compensation method, in particular to a synthetic aperture sonar motion compensation method for reducing the cumulative error of the DPC method. Background technique [0002] Synthetic aperture sonar (Synthetic Aperture Sonar: SAS) uses the movement of the small-sized matrix in the azimuth direction to form a virtual large aperture, and obtains high-resolution sonar images by coherently processing the sonar echo signals at different positions. Motion errors have a greater impact on synthetic aperture sonar imaging. The main factors that cause motion errors include the influence of wind, waves, and currents, the irregular motion of the carrier platform, the instability of the sound propagation medium, the non-uniform sound velocity, and the positioning sensor GPS and speed sensor ADL. Insufficient precision, etc. Motion error estimation and compensation is one of the important components of synthetic aperture sona...

Claims

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Application Information

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IPC IPC(8): G01S7/52G01S15/89
CPCG01S7/52G01S15/89
Inventor 段江涛黄勇刘纪元
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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