Single-near-field-correction-source-based towing linear array formation estimation method and apparatus

A correction source and near-field technology, which is applied in the direction of radio wave measurement systems and instruments, can solve the problems of limited application, large aperture, and difficulty in ensuring the precise orientation of far-field correction sources.

Pending Publication Date: 2018-06-15
TIANJIN UNIV
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Problems solved by technology

At present, the active array estimation methods all assume that the auxiliary correction source is a far-field source, and the aperture of the towed line array sonar system is generally large, and it is necessary to place a correction source with an accurate and known azimuth far away from the sh

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  • Single-near-field-correction-source-based towing linear array formation estimation method and apparatus

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Embodiment Construction

[0075] The purpose of the present invention is to overcome the disadvantages of poor practicability of the existing formation estimation methods that mostly rely on far-field correction sources, and provide a method for estimating the formation of a towed line array using a single near-field correction source. On the premise that the array element spacing is known, by placing the near-field correction source on the towing boat, the azimuth of the correction source can be precisely controlled, which conforms to the actual application situation and improves the estimation accuracy; Reduced, reducing the amount of calculation.

[0076] The first step is to determine the overall scheme of the towed line array shape estimation system.

[0077] The block diagram of the overall scheme of the towed line array shape estimation system is as follows: figure 1 As shown, it is mainly composed of a towed ship 1, a near-field correction source 2, a towed line array 4, an array element 6, a ...

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Abstract

The invention belongs to the field of array signal processing to realize accurate azimuth control of a correction source, thereby improving the formation estimation precision. Therefore, the inventionprovides a single-near-field-correction-source-based towing linear array formation estimation method and apparatus. The apparatus is composed of a towing ship, a near-field correction source, a towing linear array, an array element, a signal acquisition module, a signal transmission module and a signal processing module. The near-field correction source is installed at the head or tail of the towing ship and the position coordinate of the correction source is determined by a position sensor; the array element receives an acoustic signal propagated by an underwater acoustic channel and converts the acoustic signal into an electric signal; the signal acquisition module collects the electric signal and converts an analog signal into a digital signal; and all array element data are packaged and coded in the signal transmission module and transmits the processed data to the signal processing module. The single-near-field-correction-source-based towing linear array formation estimation method and apparatus are mainly applied to the array signal processing occasion.

Description

technical field [0001] The invention belongs to the field of array signal processing, in particular to a method and device for estimating the array shape of a towed linear array based on a single near-field correction source. Background technique [0002] Towed line array sonar has been widely used in marine monitoring and strategic early warning, etc., but due to the change of hull speed, sudden turning, disturbance of ocean currents, etc., the towed array bends, and most array signal processing algorithms such as multiple signal classification ( Multiple Signal Classification, hereinafter referred to as MUSIC), subspace fitting, etc., all realize positioning on the premise that the formation is accurately known, so the formation must be corrected before estimating the azimuth of the sound source. The current active array estimation methods all assume that the auxiliary correction source is a far-field source, and the aperture of the towed line array sonar system is general...

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Application Information

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IPC IPC(8): G01S7/52
CPCG01S7/5205
Inventor 段发阶李春月蒋佳佳王宪全卜令冉孙中波党文杰刘晗马世雄邓澈
Owner TIANJIN UNIV
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