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High-performance hybrid positioning method based on angle and signal TDOA estimation and implementation device of method

A hybrid positioning and angle estimation technology, applied in the field of navigation and positioning, can solve the problems of reducing computing efficiency and the influence of angle estimation, and achieve the effect of low computational complexity and high positioning accuracy

Pending Publication Date: 2019-07-26
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 2D MUSIC algorithm significantly reduces the computational efficiency, and later further developed into the RD MUSIC algorithm that reduces the computational complexity
Scholars from Xidian University combined time-reversal technology and coherent signal subspace method to propose a low-dive angle estimation algorithm for multipath environments, which performs better for slow-moving targets, channel mismatches, and other channel noises. Robust, but changes in terrain in complex environments can affect angle estimates

Method used

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  • High-performance hybrid positioning method based on angle and signal TDOA estimation and implementation device of method
  • High-performance hybrid positioning method based on angle and signal TDOA estimation and implementation device of method
  • High-performance hybrid positioning method based on angle and signal TDOA estimation and implementation device of method

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Embodiment 1

[0089] A high-performance hybrid positioning method based on angle and signal time difference of arrival estimation, such as image 3 shown, including the following steps:

[0090] (1) Estimating the angle of arrival of the target based on the MIMO bistatic radar, and describing the target position estimation error caused by the estimation of the angle of arrival; based on the MIMO bistatic radar system, a unitary matrix is ​​introduced, and by sharing the eigenvectors of the transmitting end and the receiving end, The classic high-resolution angle estimation algorithm is improved to a DOA estimation method with lower computational complexity and higher positioning accuracy. At the same time, according to the relationship between the angle of arrival, the launch array coordinates and the target coordinates, the target coordinates and position errors are determined. relation. Including the following steps:

[0091] Through the joint estimation algorithm of D0D and DOA, the es...

Embodiment 2

[0101] According to a high-performance hybrid positioning method based on angle and signal time difference of arrival estimation described in Embodiment 1, the difference lies in:

[0102] Step (1), including steps as follows:

[0103] A. Based on MIMO bistatic radar, deploy the radar deployment model, such as figure 1 As shown, the radar deployment model includes the target, the transmitting array, the first receiving array, and the second receiving array. Referring to the MIMO bistatic radar, the transmitting array, the first receiving array, and the second receiving array are set in different areas, and the sending The array, the first receiving array, and the second receiving array all contain multiple array elements, and the target is set as a far-field target, that is, the azimuth angle of each array element in the transmitting array, the first receiving array, and the second receiving array depends on To establish the output signal model X of the receiving array, as sh...

Embodiment 3

[0129] According to a high-performance hybrid positioning method based on angle and signal time difference of arrival estimation described in Embodiment 1 or 2, the difference is that:

[0130] Step (2), consider the signal arrival time difference of the radar deployment model, and describe the signal arrival distance error when TDOA estimation (that is, the n mentioned below TDOA ) and the relationship of the target coordinates, including the following steps:

[0131] Assuming that the electromagnetic wave emitted by the transmitting end is reflected by the UAV, it takes t time for the i-th receiving end to receive it i , the time required for the electromagnetic wave to be directly received by the i-th receiving end after being emitted by the transmitting end is t′ i , the time difference between the two propagation modes is Δτ i = t i -t' i , the distance difference between the two propagation modes is s Δi =cΔτ i ; c is the speed of electromagnetic wave propagation, ...

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Abstract

The invention relates to a high-performance hybrid positioning method based on angle and signal TDOA (time difference of arrival) estimation and an implementation device of the method. The method comprises the steps that (1) DOA (direction of arrival) estimation of a target is realized based on an MIMO (multiple-input multiple-output) bistatic radar, and a target position estimation error caused by DOA estimation is described; (2) a signal TDOA of a system is considered, and the relation between a signal arrival distance error and target coordinates during TDOA estimation is described; and (3)a least square algorithm is utilized to construct a loss function, and the target coordinates are solved. According to the method, a unitary matrix is introduced based on a signal model of the bistatic radar to improve operation efficiency; the accuracy of angle estimation is improved through feature vector sharing; and through the algorithm of utilizing two parameters, namely an angle TDOA and the signal TDOA for joint positioning, the accuracy of target position estimation is improved, and the requirement on the number of receiving arrays is lowered.

Description

technical field [0001] The invention relates to a high-performance hybrid positioning method based on angle and signal arrival time difference estimation and a realization device thereof, belonging to the technical field of navigation and positioning. Background technique [0002] Positioning methods have been widely used in various fields such as military warfare, urban management, civil, geology, emergency rescue and disaster relief. Among them, radio detection and positioning technology has attracted the attention of scholars at home and abroad. The radio detection and positioning technology based on electromagnetic wave parameters mainly includes angle estimation (DOA), signal time difference of arrival estimation (TDOA), and received signal strength estimation (RSS). The three methods can achieve independent positioning. Signal arrival time difference estimation requires clock synchronization and requires at least three receiving arrays. The received signal strength es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/00
CPCG01S7/021G01S13/003Y02D30/70
Inventor 熊海良庄众侯强任美婷龚舒
Owner SHANDONG UNIV
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