Synthetic aperture sonar imaging method and system based on frequency division MIMO

A technology of synthetic aperture sonar and imaging system, applied in radio wave measurement system, re-radiation of sound waves, utilization of re-radiation, etc. Effect

Inactive Publication Date: 2014-02-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, these two synthetic aperture sonars only use the multi-emission synthetic aperture system for DPC motion compensation, and do

Method used

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  • Synthetic aperture sonar imaging method and system based on frequency division MIMO
  • Synthetic aperture sonar imaging method and system based on frequency division MIMO
  • Synthetic aperture sonar imaging method and system based on frequency division MIMO

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Embodiment Construction

[0028] The synthetic aperture sonar with high surveying and mapping efficiency based on frequency division MIMO of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] figure 1 The frequency-division MIMO-SAS transmission array provided by the present invention is composed of two groups, and each group has two closely spaced transmission arrays. When working, the frequency bands of the signals transmitted by each transmitting array element are different from each other, and the composition order of the frequency bands of the signals transmitted in the previous frame and the transmitted signal in the next frame of each transmitting array follows the movement of the basic array as follows: figure 1 The patterns shown alternately. figure 1 It describes a diagram of the alternating change of the transmission signal sequence in a four-frame transmission process. The four rectangles in each row in the figure represent 4 trans...

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Abstract

The invention designs a synthetic aperture sonar imaging method and a system based on frequency division MIMO. The method comprises: a step 101) the front end and the rear end of N receiving arrays are respectively provided with sending arrays, wherein the front sending array and the rear sending array comprise M sending arrays altogether, the sending arrays send signals to underwater targets to be imaged at the same time, and the M is selected to be an integer which is greater than or equal to 2; a step 102) the M sending signals received by each array element of the N receiving arrays are separated in a frequency domain so that M-ary signals are obtained, and the M-ary signals of all the receiving array elements are moved to a common frequency band in a spectrum shifting mode so that N*M-ary echo signals are obtained; and step 103) the obtained N*M-ary echo signals are rearranged in an azimuth, sampling devices of an equivalent single wave beam synthetic aperture sonar are correspondingly obtained respectively, and finally focusing imaging is performed on equivalent single wave beam signals. With movement of a basic array, frequency bands of the signals sent by different sending array elements of the sending arrays can change in an alternating way according to requirements of movement compensation. A survey and mapping band can be further widened by the synthetic aperture sonar imaging method and the system under the premise of maintaining an azimuth resolution so that survey and mapping efficiency is enhanced.

Description

technical field [0001] The invention belongs to the field of underwater acoustic imaging and sonar signal processing. The present invention designs a synthetic aperture sonar imaging method based on frequency-division MIMO, which adopts an imaging system of multiple receivers and multiple transmissions, that is, the present invention provides a synthetic aperture sonar imaging system and method based on frequency-division MIMO. Background technique [0002] Synthetic Aperture Sonar (SAS) is an advanced high-resolution underwater acoustic imaging sonar. The nano-echoes are coherently processed to obtain high resolution in azimuth. [0003] The imaging efficiency of high-resolution imaging sonar is one of the decisive factors that determine whether sonar can be used in practice. For example, in the actual operation of traditional synthetic aperture sonar, under the requirement of certain surveying and mapping bandwidth (for example, the single-side surveying and mapping band...

Claims

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Application Information

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IPC IPC(8): G01S15/89
CPCG01S7/521G01S15/8904
Inventor 段江涛黄勇刘纪元
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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