Wireless radio frequency positioning method based on virtual reference label algorithm

Abstract

A wireless radio frequency positioning method based on virtual reference label algorism comprises the steps of: arranging reader at the boundary of an object region, distributing the reference labels as a rectangular grid type in the indoor object region; arranging an object with a radio frequency label in the object region, using each reader to reach the radio frequency signal intensity of each reference label and object label to be transmitted to a host computer to be processed to attain the coordinates of the object. The invention is characterized in that the host computer builds a virtual reference label in calculation, uses the virtual reference label as substrate to induce the concept of similar map; the host computer preliminarily finds the positioning region of the object on the similar map corresponding to each reader; the similar maps are intersected to reduce the positioning region of the object; the residual weighting algorism between the possible positions and the position information of the virtual reference label are used to attain the position coordinate of the object. The method has the advantages of low power consumption and high positioning accuracy.

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 virtual reference tag algorithm in the field of indoor precise positioning. Background technique [0002] Wireless positioning technology processes certain parameters of the received electromagnetic waves through specific algorithms to infer the position of the object to be measured. The measurement parameters include the transmission time, amplitude, phase, angle of arrival 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. The 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, b...

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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