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A Fast Real-time Imaging Method of Synthetic Aperture Sonar

A technology of synthetic aperture sonar and real-time imaging, which is applied in the directions of sound wave re-radiation, utilization of re-radiation, measurement devices, etc., can solve the problems of pipeline-scale data transmission volume limitation, difficulty in meeting fast real-time imaging, pipeline processing scale limitations, etc. Achieve the effect of improving aperture synthesis speed, accurate motion compensation, and reducing the limit of pipeline scale

Active Publication Date: 2016-01-27
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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AI Technical Summary

Problems solved by technology

Due to the serial distribution of data, the size of the pipeline is easily limited by the amount of data transferred
The traditional delay summation algorithm forms a virtual aperture by accumulating raw echo data. The data transmission volume between each processing unit is relatively large, and the data transmission takes a long time. Requirements for Rapid Real-time Imaging with Synthetic Aperture Sonar

Method used

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  • A Fast Real-time Imaging Method of Synthetic Aperture Sonar
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  • A Fast Real-time Imaging Method of Synthetic Aperture Sonar

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0021] This embodiment is a certain AUVSAS system, the number of array elements of the SAS related system is 12, the physical length of array elements is 15cm, the maximum detection distance is 200m, the imaging resolution is 7.5cm×3.75cm, and the real-time signal processor is completed by 7 DSP processing chips. Among them, No. 1 DSP is used for pulse compression and motion error estimation, and the other No. 2 to No. 7 DSPs are used for parallel processing of synthetic aperture pipeline. The SAS is mounted on both sides of the AUV, transmits signals at a certain period, and collects the reflected signals.

[0022] Combine below figure 1 and figure 2 The flow chart of the present invention describes the process of performing aperture synthesis processing on acquisition signals by using the present invention.

[0023] After the signal processing ...

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Abstract

The invention provides a rapid real-time imaging method for synthetic aperture sonar. According to the method, accurate propagation delay of sound waves from pixels to space sampling points is obtained according to kinematic error table look-up, and counter-propagation results of array element single sampling point echo data and process images are used for coherence stack for aperture synthesis. The method has the advantages of being accurate in imaging, small in calculation amount and capable of achieving echo data zero inventory, facilitating large-scale pipeline processing and achieving remote and large-scene high-resolution rapid real-time imaging of the seabed.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture sonar in underwater acoustic engineering, in particular to an imaging method of synthetic aperture sonar. Background technique [0002] Synthetic aperture sonar is a marine high-tech in the 21st century. It uses the linear motion of the small-aperture array to virtualize a large-aperture array, thereby obtaining high-resolution detection capabilities that are independent of signal frequency and operating distance. It is widely used in the marine military field. Applied to mine detection, waterway mapping and intelligence reconnaissance. The form of modern naval warfare is accelerating towards informatization and digitalization, and fighter jets are fleeting. Therefore, synthetic aperture sonar must have the ability of long-distance, large-scene, and high-resolution fast real-time imaging. [0003] In the field of synthetic aperture sonar, delay summation is a theoretical optimal algori...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/89
CPCG01S7/521G01S15/8904
Inventor 汲夏朱必波丛卫华
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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