Radio frequency positioning method, device and system

Abstract

The invention provides a radio frequency positioning method, device and system. The radio frequency positioning method comprises the following steps that radio-frequency signals sent out by an electronic tag of a detected object are received at different azimuth angles and pitch angles in a first position; the radio-frequency signal with the maximum intensity value is screened out from the received radio-frequency signals, and the azimuth angle and the pitch angle which correspond to the radio-frequency signal with the maximum intensity value are determined as the azimuth angle and the pitch angle, relative to the first position, of the detected object; the relative distance, relative to the first position, of the detected object is obtained according to the radio-frequency signal with the maximum intensity value at the first position; according to the geographical coordinates of the first position, the azimuth angle and the pitch angle, relative to the first position, of the detected object, and the relative distance, relative to the first position, of the detected object, the geographical coordinates of the detected object are generated.

Description

technical field [0001] The present invention relates to the field of electromechanical testing devices and instruments, in particular to a radio frequency positioning method, device and system, and more specifically, to a method, device and system for omnidirectional and long-distance radio frequency positioning of space targets. Background technique [0002] In a specific environment, it is difficult to achieve three-dimensional space positioning of long-distance targets by relying on existing positioning methods and means. For example: Although GPS and base station positioning have the characteristics of large coverage and good versatility, they are easily affected by the environment and cannot achieve high-precision positioning in closed spaces without GPS or base station signals (such as underground parking lots, mines or warehouses). Low-cost positioning; Infrared indoor positioning is only suitable for short-distance transmission, and is easily affected by fluorescent ...

AI Technical Summary

Problems solved by technology

The Chinese patent application with publication number CN103728645A proposes an indoor and outdoor positioning system and its positioning method. Due to the influence of the position of the signal receiving antenna and the diffraction of electromagnetic waves, it is difficult to rely on the receiving and positioning equipment to determine the azimuth of the portable device or the target. Calculate the distance between the target and the receiving device based on the signal strength

The Chinese patent application with publication number CN103679087A proposes a positioning method based on radio frequency technology, which relies on adjusting the recognition range of the card reader to determine the approximate range of the tag, but it is difficult to determine its azimuth, angle and height

The Localizers indoor positioning system developed by AWTHER WIRE & LOCATION of the United States uses at least three reference points, and monitors the pseudo-random signals carried in the signal through the pulse communication between the ultra-wideband receiver with positioning and several reference positioning transceivers. Code time delay to judge the distance to different reference points, and then determine the three-dimensional coordinates of unknown points, but this solution is expensive and can only be used in indoor environments, and cannot realize portable measurement in outdoor environments or complex environments

The Chinese patent application with the publication number CN101770009A proposes a radio frequency positioning technology. In the measurement process, a reference signal source or a reference electronic tag needs to be added, and the relative distance between the reader and the reference signal source needs to be determined to realize the estimation of the target distance. , which increases the difficulty of measurement, and cannot realize the measurement of three-dimensional space distance

The Chinese patent application with the publication number CN101300504A discloses a radio frequency positioning system, which mainly relies on multiple locators to measure the position. This method is not only expensive, but also can only measure the plane position, and cannot determine its height range.

The Chinese patent application with the publication number CN101672907A estimates the distance to the radio frequency positioning system based on the antenna size of the minimum power radio frequency signal received in the antenna group, which also cannot realize the three-dimensional positioning of the target

[0004] Comprehensive research found that although relative distance measurement can be achieved with the help of radio frequency identification technology, the measured information is limited to plane distance or relative distance, and it is difficult to obtain the geographical coordinates (including longitude, latitude and altitude) of the measured target or relative to the reader. The azimuth angle, pitch angle and height information, can not obtain accurate three-dimensional space geographic coordinate information

Therefore, the existing positioning technology, whether it is wireless local area network positioning or radio frequency identification tag positioning system, can only achieve approximate ranging and positioning on a two-dimensional plane, and cannot achieve low-cost outdoor or complex environment three-dimensional coordinate positioning

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