Wireless radio frequency positioning method

Abstract

A radio frequency positioning method comprises the steps as follows: readers are arranged at the border of a region to be monitored; reference tags are fixed in the indoor region to be monitored in the form of rectangular grids; when an object which is provided with radio frequency tags and ready to be monitored is arranged in the region to be monitored, all the readers detect the electromagnetic waves of all the radio frequency tags through their own antennas, and the radio frequency signal intensity values of the reference tags which are obtained by the measurement and the tags of the object to be monitored are sent to an upper computer; the upper computer compares the absolute difference value of the radio frequency signal intensity of all the reference tags and the tags of the object to be monitored to determine a plurality of nearest reference tags which are in the vicinity of the object to be monitored; and the position of the object to the monitored is calculated according to the position information and the weighting factors of a plurality of nearest reference tags which are in the vicinity of the object to be monitored. A positioning system can have good flexibility and dynamic property, as well as good accuracy and real-time property on the position sensing aspect with the help of the radio frequency positioning method.

Description

technical field [0001] The invention relates to a wireless precise positioning method, in particular to a wireless radio frequency positioning method based on the signal strength value of a radio frequency identification tag 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 t...

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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