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Square ultra-short baseline positioning method

An ultra-short baseline positioning and ultra-short baseline technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve problems such as performance deterioration, achieve high positioning accuracy, avoid phase ambiguity, and improve the signal-to-noise ratio of received signals.

Pending Publication Date: 2022-05-13
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the performance of the current ultra-short baseline method deteriorates sharply when some array elements fail, avoid phase ambiguity, and improve positioning accuracy

Method used

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  • Square ultra-short baseline positioning method
  • Square ultra-short baseline positioning method
  • Square ultra-short baseline positioning method

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Embodiment Construction

[0083] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0084] Such as figure 1 As shown, a square array ultra-short baseline positioning method proposed by the present invention uses the LS-ESPRIT (least squares-rotation invariant subspace) algorithm to perform spectrum estimation to obtain the incoming wave azimuth estimation result.

[0085] Such as figure 1 As shown, the overall implementation process is divided into nine steps and completed sequentially. The input signal is converted into a baseband signal through quadrature demodulation. During the initial positioning, the baseband signal undergoes DFT beamforming to obtain an initial estimate of the incoming wave azimuth. When the positioning result has been obtained, pre-beamform...

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Abstract

The invention relates to a square ultra-short baseline positioning method. The method comprises the following steps: carrying out orthogonal down-conversion, low-pass filtering and down-sampling processing on a received signal of an ultra-short baseline; and then a series of operations including pre-beam forming, DFT beam forming, phase shift beam forming, pulse compression, LS-ESPRIT spectrum estimation, Doppler compensation, sound velocity correction, coordinate transformation and the like are carried out to obtain the position of the beacon in the geodetic coordinate system. The method is long in acting distance and high in positioning precision, and avoids phase ambiguity; and the performance is stable when a part of array elements fail.

Description

technical field [0001] The invention belongs to the field of position measurement of manned and unmanned submersibles, in particular to a square ultra-short baseline positioning method. Background technique [0002] The ultra-short baseline positioning system is a common underwater positioning system, which estimates the position of the target by measuring the phase difference or delay difference between channels and the slant distance from the target to the base array. The ultra-short baseline has the characteristics of small size, simple structure, easy installation, and low cost. It is widely used in the position determination of manned and unmanned submersibles by mother ships. [0003] The traditional narrow-band ultra-short baseline is susceptible to performance degradation due to frequency fading, low positioning accuracy and poor stability. Using a broadband signal improves positioning performance and avoids phase ambiguity. The current broadband ultra-short baseli...

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Application Information

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IPC IPC(8): G01S5/18
CPCG01S5/18
Inventor 汪伟刘烨瑶李欣国梁涛郭卫振朱敏杨波
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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