Method of compensating motion error of multi-aperture synthetic aperture sonar

A synthetic aperture sonar and motion error technology, applied in the field of signal processing, can solve the problems of large amount of calculation, uneconomical and practical navigation equipment motion compensation method, poor real-time performance, etc., and achieve the effect of improving the focus quality

Active Publication Date: 2017-08-18
中国人民解放军91388部队
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Problems solved by technology

Generally speaking, navigation equipment can provide accurate rotation information of sonar systems such as yaw and roll, and can also provide robust acceleration information in the direction of roll and heading; but high-precision navigation equipment is expensive, while low-cost navigation equipment The equipment cannot meet the sub-wavelength accuracy requirements required by the high-resolution SAS system, making the motion compensation method based on navigation equipment very uneconomical and practical
The second method has a large amount of calculation and poor real-time performance, and is generally suitable for image post-processing.

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  • Method of compensating motion error of multi-aperture synthetic aperture sonar

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[0039] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Such as figure 1 As shown, a kind of multi-subarray synthetic aperture sonar motion error compensation method described in the present embodiment is characterized in that, comprising the following steps:

[0041] S1. Perform pulse compression in the range direction on the echo data of each receiving array element;

[0042] S2. For each receiving array element data that is spaced separately for sending and receiving, perform a combination of sending and receiving conversion;

[0043] S3. Statistically average the overlapping phase centers in two adjacent pulses along the distance direction;

[0044] S4. Estimate the average phase error of the winding in each transmit pulse;

[0045] S5. Accumulate the phase error estimated before the cur...

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Abstract

The invention provides a method of compensating motion error of a multi-aperture synthetic aperture sonar. The method carries out average processing on independent echo data measurement at each time, common motion error information is extracted, and sway error of the multi-aperture synthetic aperture sonar can further be estimated. The method of the invention can estimate the sway error of the multi-aperture synthetic aperture sonar with a small amount of calculation, and thus, the focusing quality of the multi-aperture synthetic aperture sonar image is further improved.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a motion error compensation method of a multi-subarray synthetic aperture sonar. Background technique [0002] The image reconstruction of synthetic aperture sonar is based on the receiving and emitting path difference obtained from the geometric relationship between multiple pulse signals. have a noticeable impact on image quality. In practical applications, natural environmental factors such as wind, waves, swells, and human factors such as ship maneuverability can cause the sonar carrier to deviate from the ideal track; not only that, but also factors such as time and space fluctuations and multipath effects of the underwater acoustic medium. This will result in poor focus of the sonar image. Therefore, for a high-resolution synthetic aperture sonar system, it is necessary to accurately estimate and compensate the sonar motion error that deviates from the ideal t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S7/539G01S15/89
CPCG01S7/52003G01S7/539G01S15/8997
Inventor 张学波杨搏夏雪李海屈武彭成王华奎
Owner 中国人民解放军91388部队
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