Virtual ultra-short baseline positioning method based on subarray division

A technology of ultra-short baseline positioning and sub-array division, which can be used in positioning, radio wave measurement systems, measurement devices, etc., and can solve the problem of low underwater positioning accuracy.

Inactive Publication Date: 2020-07-07
HARBIN ENG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the problem that the underwater positioning accuracy of the existing ultra-short baseline positioning system is not high under the

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  • Virtual ultra-short baseline positioning method based on subarray division
  • Virtual ultra-short baseline positioning method based on subarray division
  • Virtual ultra-short baseline positioning method based on subarray division

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Embodiment Construction

[0023] In this embodiment, the virtual ultra-short baseline positioning method based on sub-array division can perform accurate underwater positioning under low signal-to-noise ratio conditions, including the following steps:

[0024] Step 1. Divide the receiving matrix into four sub-arrays, and form a group of virtual ultra-short baselines with the reference centers of the four sub-arrays;

[0025] Step 2, performing beamforming on the four sub-arrays respectively to obtain array output signals of the four sub-arrays;

[0026] Step 3, using the output signals of the four sub-arrays to perform ultra-short baseline positioning to obtain the target position.

[0027] The receiving matrix in this embodiment is a uniform planar array composed of multiple primitives.

[0028] In Step 1 of this embodiment, the virtual ultra-short baseline is equivalently formed by four sub-arrays, and the geometric centers of the sub-arrays are the primitives of the ultra-short baseline. When sele...

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Abstract

The invention discloses a virtual ultra-short baseline positioning method based on subarray division, solves the problem of low underwater positioning precision of an existing ultra-short baseline positioning system under the condition of a low signal-to-noise ratio, and belongs to the technical field of ultra-short baseline positioning. The method comprises the following steps: S1, dividing a receiving array into four sub-arrays, and forming a group of virtual ultra-short baselines by reference centers of the four sub-arrays; S2, performing beam forming on the four sub-arrays to obtain arrayoutput signals of the four sub-arrays; S3, performing ultra-short baseline positioning by using the output signals of the four sub-arrays to obtain a target position. According to the invention, the array gain advantage of the array can be effectively utilized, and the position of the underwater target can be accurately estimated under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention relates to a virtual ultra-short baseline positioning algorithm based on subarray division, and belongs to the technical field of ultra-short baseline positioning. Background technique [0002] Hydroacoustic positioning technology is the key to human beings relying on many underwater vehicles to enter the deep sea, detect the deep sea and develop the deep sea. It has a wide range of applications in the fields of marine engineering and marine resource development. [0003] The underwater acoustic positioning technology receives the acoustic waves emitted by the underwater transponder through the transducer array on the water surface to estimate the time delay difference between each element to estimate the relative distance and orientation to the target, and realize the accurate estimation of the target position. Hydroacoustic positioning systems are classified according to baseline length: long baseline positioning system, short baseline...

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Application Information

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IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 孙大军张居成郑翠娥韩云峰崔宏宇
Owner HARBIN ENG UNIV
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