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Asymmetric-station-distribution multivariate-differential time difference positioning error analyzing method

An error analysis and time difference positioning technology, applied in positioning, measuring devices, instruments, etc., can solve the problems of irregular station layout, long baseline time difference system positioning accuracy restriction, etc., and achieve the effect of reducing computational complexity

Inactive Publication Date: 2018-11-30
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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AI Technical Summary

Problems solved by technology

However, the positioning accuracy of the long baseline time difference system is restricted by the relative geometric relationship between the target and the positioning system
In the actual battlefield environment, station deployment is limited by terrain and tactical applications, and irregular station deployment is prone to occur

Method used

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  • Asymmetric-station-distribution multivariate-differential time difference positioning error analyzing method
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  • Asymmetric-station-distribution multivariate-differential time difference positioning error analyzing method

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specific Embodiment approach

[0037] 1. Establish a marking system suitable for asymmetric station deployment scenarios.

[0038] Since the actual physical position of the observation station is known, in order to make the auxiliary stations symmetrically distributed on both sides of the main station, the main station is taken as the observation origin, and the angle bisector of the angle between the three stations is taken as the Y axis, and a Cartesian coordinate system is established, as shown in figure 2 shown. In this coordinate system, the position of the target obtained by time difference positioning is the relative position between the target and the master station. The real longitude and latitude of the target can be obtained according to the time observation position of the master station.

[0039] 2. Deduce the quantitative expression of positioning error.

[0040] In the coordinate system established in step 1,

[0041] Differentiate the arrival time and the position of the time difference ...

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Abstract

The invention provides an asymmetric-station-distribution multivariate-differential time difference positioning error analyzing method. A main station serves as an observation original point, thus allauxiliary stations are symmetrically distributed on the two sides of the main station, the angular bisector of an included angle of the three stations serves as the Y axis, a Cartesian coordinate system is established, and the relative position between a positioning target and the main station is obtained under the coordinate system; and under a model, the arrival time and station location distribution are subjected to multivariate-differential, a positioning circular probable error mathematical expression is deduced, and positioning circular probable error mathematical expressions at different detection distances are further calculated. The mathematical model is established to quantitatively analyze the influences of the factors on the positioning error, the mathematical expressions of the positioning error circular probable density under asymmetric station distribution are deduced, and the engineering practical value is achieved.

Description

technical field [0001] The technical invention belongs to the field of passive reconnaissance. Background technique [0002] Time-difference positioning is a passive positioning technology that uses the time difference of the same radiation source signal to arrive at multiple stations to form a hyperbola (surface) for positioning. In the case of foundation, the long-baseline time-of-flight positioning system has the advantages of high positioning accuracy and low equipment requirements, and has been widely used in engineering realization. However, the positioning accuracy of the long-baseline time-of-flight system is limited by the relative geometric relationship between the target and the positioning system. In the actual battlefield environment, station deployment is limited by terrain and tactical applications, and irregular station deployment is prone to occur. [0003] In recent years, there has been a lot of research on the optimal station deployment of multi-station...

Claims

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Application Information

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IPC IPC(8): G01S5/12G01S5/02
CPCG01S5/021G01S5/12
Inventor 朱玉严波刘佳媛
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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