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Method and system of joint location based on T2/R time difference and Doppler shift

A Doppler frequency shift and joint positioning technology, which is applied in the field of T2/R-based time difference and Doppler frequency shift joint positioning methods and systems, and can solve problems such as too many transmitting stations.

Inactive Publication Date: 2016-04-13
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method that only needs two transmitting stations, and aims at the defect that only the state of uniform motion is considered in the passive passive positioning system in the prior art, and the number of transmitting stations is too large. Variable speed moving targets can be precisely positioned based on T 2 / R Time Difference and Doppler Frequency Shift Joint Positioning Method and System

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  • Method and system of joint location based on T2/R time difference and Doppler shift
  • Method and system of joint location based on T2/R time difference and Doppler shift

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[0066] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0067] like figure 1 As shown, the embodiment of the present invention is based on T 2 The time difference and Doppler frequency shift joint positioning method of / R includes the following steps:

[0068] S1. Select two shortwave broadcasting stations with different signal frequencies as the transmitting station, obtain their transmitting frequencies and coordinate positions, and calculate the ground great circle distance between the transmitting station and the receiving station according to the coordinate positions;

[0069] S2. Use the time difference measurement method according to t...

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Abstract

The present invention discloses a method and system of joint location based on T2 / R time difference and Doppler shift. The method comprises the following steps: S1, selecting two shortwave broadcasting stations with different signal frequencies as launch stations, obtaining their emission frequencies and coordinate positions, and calculating the big circle distances of the ground between the launch stations and an accepting station; S2, calculating the time difference data and Doppler shift data between a direct wave and a scattered wave according to the signal frequencies and the big circle distances of the ground; S3, jointing the obtained time difference data and the Doppler shift data to obtain an estimating equation of a target state, and obtaining a convergence result through calculation according to batch algorithms, namely the position and the flight speed of a flying target. Only two broadcasting stations are needed to be taken as sources of radiation to locate a moving aerial target, so that the aspects of the position precision and the speed precision are greatly improved for the targets in a uniform motion and a variable motion.

Description

technical field [0001] The present invention relates to the field of signal processing, in particular to a 2 / R time difference and Doppler frequency shift joint positioning method and system. Background technique [0002] Target positioning currently has very important practical significance in the military field, mobile communication field, medical field, and civil field. Passive passive positioning technology, because the system does not actively transmit signals, only relies on receiving electromagnetic signals reflected by the positioned target to determine its spatial position, which is an important direction for future development. [0003] In recent years, in passive passive positioning systems, it is generally based on direction angle of arrival (DOA), time of arrival (TOA), time difference of arrival (TDOA), Doppler frequency, signal strength (RSSI), and various joint methods. Locate the target. Since the time difference is only related to the target position, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/87G01S13/48
CPCG01S13/878G01S13/48
Inventor 程莉秦实宏党晶晶袁梦邹连英
Owner WUHAN INSTITUTE OF TECHNOLOGY
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