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Ultra-short base line orientation estimation method and system of any formation, equipment and storage medium

An ultra-short baseline and azimuth estimation technology, applied in radio wave measurement systems, positioning, direction finders using ultrasonic/sonic/infrasonic waves, etc., can solve problems such as inability to expand complex formations and performance degradation

Active Publication Date: 2019-09-17
INST OF ACOUSTICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The performance of the current broadband ultra-short baseline method deteriorates sharply when some array elements fail, and the problem that it cannot be extended to complex formations

Method used

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  • Ultra-short base line orientation estimation method and system of any formation, equipment and storage medium
  • Ultra-short base line orientation estimation method and system of any formation, equipment and storage medium
  • Ultra-short base line orientation estimation method and system of any formation, equipment and storage medium

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Embodiment Construction

[0095] An ultra-short baseline azimuth estimation method for an arbitrary formation proposed by the present invention obtains an incoming wave azimuth estimation result by constructing a wideband joint matching maximum likelihood estimation of a general formation.

[0096] Such as figure 1 As shown, the overall implementation process is completed in three steps:

[0097] Step 1) Initialize the delay adjustment matrix and the distributed search grid;

[0098] Step 1-1) construct delay adjustment matrix;

[0099] The center carrier frequency of the communication waveform signal is f c , the signal bandwidth is B, and the received signal x(t) becomes a zero-IF baseband signal x after mixing 1 (t); Delay the original received signal by time d, that is, x(t-d), and turn it into a zero-IF baseband signal x after mixing 2 (t), then there are:

[0100] x 2 (t)=x 1 (t-d)exp{-j2πf c d} (1)

[0101] The function of the complex exponential product term is to make up for the resid...

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Abstract

The invention provides an ultra-short base line orientation estimation method for any formation. The method comprises the steps of initializing a delay adjustment matrix according to a received signal and a delay signal thereof, thus acquiring a delay adjustment matrix function, and initializing a distributed search network; detecting the arrival time of the signals, determining synchronous moments, sampling the synchronous moments, building a synchronous sampling moment set, thus acquiring a reference array element sampling sequence of the signal arrival moments; and computing the rotated distributed search network, computing a matched peak of each direction vector under the synchronous sampling moment set according to the reference array element sampling sequence of the signal arrival moments and the delay adjustment matrix function, and traversing orientation angles, wherein the direction of the maximum matched peak is the final estimated orientation vector. The ultra-short base line orientation estimation method for any formation provided by the invention can be expanded to various complex formations, and is stable in performance when the part of array elements is invalid, and high in estimation accuracy of the distance and orientation of the target signal source.

Description

technical field [0001] The invention belongs to the field of underwater autonomous vehicle position measurement in a seabed observation network, and in particular relates to a method, system, device and storage medium for estimating an ultra-short baseline orientation of an arbitrary formation. Background technique [0002] The ultra-short baseline uses multiple array elements to receive the target signal, and realizes the estimation of the distance and azimuth of the target signal source according to the signal arrival time and the phase difference received by the multiple array elements. The ultra-short baseline has the characteristics of small matrix and simple structure, and is widely used in the position determination of manned submersibles and unmanned submersibles by the mother ship, and the control of the docking process of underwater autonomous vehicles in the submarine observation network. [0003] The traditional single-frequency ultra-short baseline is susceptibl...

Claims

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Application Information

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IPC IPC(8): G01S3/82G01S5/20G01S5/30
CPCG01S3/82G01S5/20G01S5/30
Inventor 武岩波刘学承朱敏房小芳
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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