Method and system for terrestrial co-frequency multi-stationary radiation source location based on time-frequency difference

A technology of positioning system and positioning method, applied in satellite radio beacon positioning system, radio wave measurement system, instrument, etc., can solve problems such as time-frequency difference ambiguity, achieve high positioning results, and remove the effect of time difference and frequency difference ambiguity

Active Publication Date: 2020-07-17
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-stationary radiation source positioning method and system based on time-frequency difference, to solve the problem of time-frequency difference ambiguity in the same-frequency multi-stationary radiation source positioning, and to improve positioning accuracy

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  • Method and system for terrestrial co-frequency multi-stationary radiation source location based on time-frequency difference
  • Method and system for terrestrial co-frequency multi-stationary radiation source location based on time-frequency difference
  • Method and system for terrestrial co-frequency multi-stationary radiation source location based on time-frequency difference

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[0049] 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.

[0050] A specific embodiment of the present invention discloses a ground same-frequency multi-stationary radiation source positioning method based on time-frequency difference, such as figure 1 shown, including the following steps:

[0051] Step S1, establish the state transition equation of the ground static radiation source of the dual-satellite time-frequency difference positioning system, and form the measurement dynamic system equation together with the state transition equation and the measurement equation of the time-frequency difference; for multiple radiation sources containing the same frequency The target performs time-frequency difference es...

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Abstract

The invention discloses a method and a system for positioning ground co-frequency multiple stationary radiation sources based on time-frequency difference, and belongs to the field of positioning technology. The method comprises steps of performing time-frequency difference estimated measurement for multiple targets including co-frequency radiation sources to obtain all measurement vectors including time-frequency fuzzy information; performing GM-UKF-PHD filtering on all the measurement vectors, and releasing the time-frequency difference blur to obtain the states of the radiation sources including weight information; and using a target state extraction method based on the weight threshold to extract states of multiple stationary radiation sources. The method and the system of the presentinvention use the GM-UKF-PHD filtering algorithm to perform multi-target state estimation according to the observed TDOA and FDOA measurement at multiple times, and improve the positioning accuracy ofthe radiation sources while solving the time-frequency difference blur. For lower frequency bands such as UHF and L / S, the method and the system have a large reference value for improving the positioning accuracy of low-band multi-ground stationary radiation sources because multiple co-frequency signals are often received at the same time.

Description

technical field [0001] The invention relates to the technical field of positioning, in particular to a method and system for locating ground co-frequency multi-stationary radiation sources based on time-frequency difference. 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 radiation source...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42
CPCG01S19/423
Inventor 尤明懿周慧文
Owner 36TH RES INST OF CETC
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