Positioning method based on wireless radio frequency recognition technology

Abstract

A positioning method which is based on the wireless radio frequency identification technology comprises the steps that readers are arranged at the boundary of a zone to be monitored; reference tags are fixed at an indoor zone to be monitored in a rectangular grid type; when an object to be monitored with radio-frequency tags is arranged in the zone to be monitored, each of the readers detects the electromagnetic wave of each radio-frequency tag through the antenna of each of the readers, the radio-frequency signal intensity values of the reference tags which are obtained by the measurement and the tags of the object to be tested are sent to an upper computer; the upper computer compares the absolute difference values of the radio-frequency signal intensity of each of the reference tags and the tags of the object to be tested to determine a plurality of nearest reference tags of the object to be tested; each nearest reference tag and the calculated position of the object to be tested are obtained through the trilateration method, and the average measurement error of a system is obtained by comparing the calculated positions and the actual positions of the nearest reference tags; the calculated positions of the object to be tested adds the average measurement error to obtain the position coordinates of the object to be tested. By utilizing the method of the invention, a positioning system has good accuracy and real-time in the aspect of position induction.

Description

Technical field [0001] The invention relates to a wireless precise positioning method, in particular to a wireless radio frequency positioning method based on a radio frequency identification tag in the field of indoor precise positioning. Background technique [0002] The wireless positioning technology uses a specific algorithm to process certain parameters of the received electromagnetic waves to infer the position of the object to be measured. The measurement parameters include the transmission time, amplitude, phase, reach angle and signal strength of the test signal. At present, with the continuous development of wireless technology, mobile computing devices and the Internet, indoor positioning service systems have attracted more and more attention. Commonly used indoor wireless positioning technologies are: [0003] (1) Indoor GPS positioning technology: GPS is currently the most widely used positioning technology. However, when the GPS receiver works indoors, the signal i...

AI Technical Summary

Problems solved by technology

However, when the GPS receiver works indoors, because the signal is greatly attenuated by the influence of buildings, its positioning accuracy is very low, the positioning speed is relatively slow, and the cost of the locator terminal is high

[0004] (2) Cellular positioning technology: Cellular networks such as GSM and CDMA all support positioning technology, but factors such as non-line-of-sight propagation, multipath effect, and multiple access interference reduce its positioning accuracy, and involve user privacy issues, making its promotion restricted. certain restrictions

[0005] (3) Infrared technology: Active tags based on diffuse infrared technology can be used for indoor positioning, but it requires that the object to be tested must be in a straight line with the infrared reader, and the positioning distance is too close, so the practical application is of little significance

The system applying this kind of technology is easy to build, but the measurement accuracy is not satisfactory and needs to be further improved

[0007] (5) Ultrasonic technology: At present, the successful use of this technology can indeed achieve high positioning accuracy, but it requires a large amount of infrastructure support, the cost is expensive, and it cannot be widely promoted

The cost of current readers is relatively high, and most of them can only work at a single frequency point

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