A synthetic aperture sonar image positioning method and system
A synthetic aperture sonar and image positioning technology, which is applied in the directions of sound wave re-radiation, radio wave measurement system, and utilization of re-radiation, can solve the problem of synthetic aperture sonar positioning difficulty, and achieve the effect of solving difficult positioning
Inactive Publication Date: 2012-02-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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[0004] In order to solve the above problems, the object of the present invention is to provide a synthetic aperture sonar image positioning method and system, the system can accurately locate the sonar image, and solve the difficult problem of synthetic aperture sonar positioning
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] figure 1 It is a schematic diagram of the main system composition and working mode of the synthetic aperture sonar. Such as figure 1 As shown, a transmitting transducer and a receiving transducer array (or receiving array) are installed on the side of the towing body, and electronic devices such as an acoustic Doppler log ADL (measuring speed and height from the bottom of the towing body) are installed inside the towing body. In the system, the dry-end signal processor and GPS are installed on the tugboat, and the tugboat drags the towing body along a straight line through the towline, and all the signals of the wet end are transmitted to the dry-end signal processor through the towline for imaging processing.
[0022] figure 2 It is a schematic diagram of the main parts of the image positioning system of the synthetic aper...
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The invention provides an image-locating method of synthetic aperture sonar and a system. The method comprises the following steps: mounting a launching site at the front end of a towed body of the system for launching a single-frequency signal or a linear frequency modulated signal; respectively mounting receiving energy transducers in the same depth at both sides of a towboat to receive signalsemitted by the launching site on the towed body and respectively calculate the distances of the receiving energy transducers at both sides from the towed body according to the received signals; fitting a towboat track close to a straight line according to the position of the towboat to deduce a distance and an azimuth angle of the towed body from the position of the towboat; deducing the positionof the towed body according to the distance, the azimuth angle and the GPS position of the towboat; and calculating the position of each pixel in an image according to the position of the towed body,a height to bottom measured by an ADL on the towed body and a synthetic aperture length. The invention can accurately position the sonar image by adding two receiving energy transducers and one launching site to the prior system, thereby being simple and practical and solving the problem that the synthetic aperture sonar is hard to position.
Description
technical field [0001] The invention belongs to the field of synthetic aperture sonar signal processing, and mainly relates to an image positioning method and system in a synthetic aperture sonar system. Background technique [0002] Synthetic aperture imaging sonar is an acoustic imaging device. It uses an acoustic "antenna" to emit sound waves at multiple positions to irradiate the measured object, and receives the reflected sound waves, and forms a virtual large "antenna" through signal processing. , so that the imaging effect can be obtained with a resolution much higher than that of using an "antenna". It is mainly used for seabed surveying and mapping, target salvage and other operations. Its main system composition and working methods are as follows: figure 1 As shown, the towing body drags the tugboat forward roughly in a straight line, and a transmitting transducer and a receiving transducer array (or receiving array) are installed on the towing body, and an acous...
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IPC IPC(8): G01S7/52G01S15/89
CPCG01S15/8904
Inventor 李丽英刘纪元黄海宁张春华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI