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TDOA (Time difference of Arrival) positioning method and system based on time correction and device

A technology of time correction and positioning method, which is applied in positioning, measuring devices, radio wave measuring systems, etc. It can solve the problems of low synchronization accuracy of positioning time and high power consumption of TDOA positioning, so as to reduce the number of communications and computational complexity , the effect of improving the accuracy

Inactive Publication Date: 2019-08-27
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problems of high power consumption of TDOA positioning and low accuracy of positioning time synchronization, the first aspect of the present invention proposes a TDOA positioning method based on time correction, which includes:

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  • TDOA (Time difference of Arrival) positioning method and system based on time correction and device
  • TDOA (Time difference of Arrival) positioning method and system based on time correction and device

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[0038] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than Full examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, not to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are sho...

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Abstract

The invention belongs to the technical field of indoor wireless positioning, particularly relates to a TDOA (Time Difference of Arrival) positioning method and system based on time correction, and a device, and aims to solve the problems of high TDOA positioning power consumption and low positioning time synchronizing accuracy. The method comprises the following steps: calculating clock drift based on the sending time, time of arrival and preset sending interval of a time correction message between a main station and a plurality of slave stations, and eliminating the clock drift error by usinga two-dimensional Kalman filtering method; correcting time when positioning messages are received from the slave stations according to positioning message sending time of a wireless card, the receiving time of each slave station and the error-eliminated clock drift; and calculating the difference between time when the main station and each corrected slave station receive the positioning message,calculating the distance between the card to each slave station according to the time difference, building dual-curve equations, and solving the plurality of dual-curve equations to obtain the position of the wireless card. Through adoption of the method, the positioning power consumption of the TDOA is lowered, and the positioning time synchronizing accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of indoor wireless positioning, and in particular relates to a time correction-based TDOA positioning method, system and device. Background technique [0002] Currently, time-based wireless positioning methods mainly include time of arrival (TOA) and time difference of arrival (TDOA). TOA positioning refers to measuring the arrival time from the card to the base station multiplied by the electromagnetic wave rate to obtain the distance between the card and the base station, thereby realizing positioning. In fact, due to the limitation that the TOA positioning requires the card and all base stations to have the same clock reference, the two-way TOA method is often used, that is, the card sends a message packet to the base station, and the base station replies with a response message packet after a certain delay. This method avoids time synchronization between the card and the base station, but requires the c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0273
Inventor 李学恩游博
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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