Method, system, device and storage medium for estimating ultra-short baseline orientation of arbitrary formation

An ultra-short baseline and azimuth estimation technology, which is applied in radio wave measurement systems, positioning, and direction finders using ultrasonic/sonic/infrasonic waves, etc., can solve the problems of performance deterioration and inability to expand complex formations, and achieve stable performance and improved Orientation estimation performance, the effect of avoiding phase ambiguity

Active Publication Date: 2021-05-18
INST OF ACOUSTICS CHINESE ACAD OF SCI
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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

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  • Method, system, device and storage medium for estimating ultra-short baseline orientation of arbitrary formation
  • Method, system, device and storage medium for estimating ultra-short baseline orientation of arbitrary formation
  • Method, system, device and storage medium for estimating ultra-short baseline orientation of arbitrary formation

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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 present invention proposes a method for estimating an ultra-short baseline azimuth of an arbitrary formation, comprising: initializing a delay adjustment matrix according to a received signal and its delay signal, obtaining a delay adjustment matrix function, and initializing a distributed search grid; detecting the arrival of a signal Time, determine the synchronization time, perform synchronization time sampling, construct a collection of synchronization sampling time, and obtain the reference array element sampling sequence at the signal arrival time; calculate the distribution search grid after rotation, and adjust according to the reference array element sampling sequence and delay at the signal arrival time The matrix function calculates the matching peak value of each direction vector at the set of synchronous sampling time, performs azimuth angle traversal, and the direction of the maximum value of the matching peak value is the final estimated azimuth vector. The ultra-short baseline azimuth estimation method for any formation of the present invention can be extended to various complex formations, has stable performance when some array elements fail, and has high accuracy in estimating the distance and azimuth of a 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...

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Application Information

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Patent Type & Authority Patents(China)
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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