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Ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding

A radiation source, multi-motion technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the problems of time-frequency difference blurring and inability to track, and achieve the effect of removing time-frequency difference and frequency difference blurring.

Active Publication Date: 2018-09-04
36TH RES INST OF CETC
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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a ground same-frequency multi-movement radiation source tracking method and system based on time-frequency difference and direction finding, to solve the problems caused by time-frequency difference ambiguity when locating the same-frequency multi-movement radiation source. Unable to track the problem, realize the tracking of radiation sources with multiple motions at the same frequency

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  • Ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding
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  • Ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding

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[0057]Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention.

[0058] A specific embodiment of the present invention discloses a ground co-frequency multi-movement radiation source tracking method based on time-frequency difference and direction finding, such as figure 1 shown, including the following steps:

[0059] Step S1, based on the dual-satellite time-frequency difference positioning system, establish a measurement model and an iterative filtering model for targets with multiple moving radiation sources;

[0060] The measurement model includes a ground motion radiation source state transition equation and a measurement equation;

[0061] The coordinate system of the double-star time-frequency difference posi...

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Abstract

The invention discloses a ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding, and belongs to the technical fieldof positioning. The ground common-frequency multi-motion radiation source tracking method based on time-frequency difference and direction finding includes the steps: establishing a measurement modeland an iterative filtering model for multi-motion radiation source targets of a dual-satellite time-frequency difference positioning system; determining the iterative stop condition of iterative filtering of the filtering model; and realizing tracking of the common-frequency motion source target in an unknown motion state. The ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding can filter all the fuzzy time difference and frequency difference measurement as the target measurement to avoid understanding the complicated problem of the fuzzy, and can determine the optimal motion target filtering estimation result by setting the weight threshold and realize tracking of the common-frequency multi-motion radiation source. Besides, for UHF and L / S frequency band targets that often receive multiple common-frequency signals at the same time, the ground common-frequency multi-motion radiation source tracking method and system based on time-frequency difference and direction finding has great reference significance for improving tracking of low-frequency band multi-motion radiation sources.

Description

technical field [0001] The invention relates to the technical field of positioning, in particular to a ground co-frequency multi-moving radiation source tracking method and system based on time-frequency difference and direction finding. Background technique [0002] Passive positioning has a wide range of military and commercial applications. In order to provide accurate radiation source position estimation results, the dual-satellite (station) time-frequency difference positioning system has been widely used. The important step in the dual-satellite (station) time-frequency difference positioning system is to estimate the time difference (TDOA) and frequency difference (FDOA) to the dual-satellite (station) according to the radiation source signal received by the satellite. However, when the frequencies of multiple radiation sources are similar or even the same, and the signal patterns are consistent, it is impossible to judge the corresponding relationship between the rad...

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Application Information

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IPC IPC(8): G01S19/42
CPCG01S19/423
Inventor 尤明懿陆安南
Owner 36TH RES INST OF CETC
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