UWB based three-dimensional indoor positioning system

Abstract

The invention provides a UWB based three-dimensional indoor positioning system which relates to the wireless communication network positioning technology field and comprises a label fixedly attached on a positioning target, at least four base stations fixedly arranged indoors with their coordinates known and a positioning terminal. Through the use of label polling and communication within the base stations for two-way ranging, the clock synchronization problem required between the label and the base stations can be avoided; and since the distances from the label to the base stations are packaged and transmitted to the positioning terminal, the complexity and cost of the positioning system are reduced greatly. The operation for the positioning data are placed on a computer, which greatly reduces the burden of a single-chip microcomputer and enables smaller positioning delays. The utilization of the amplitude limit weight recursion mean value filtering algorithm can process the obtained three-dimensional coordinates respectively so as to achieve higher positioning accuracy.

Description

technical field [0001] The invention relates to the technical field of wireless communication network positioning, in particular to an ultra-bandwidth indoor positioning method and system. Background technique [0002] 70%-80% of human activities occur indoors, so location-based services are becoming more and more important in life, especially the use of mobile devices to provide navigation and positioning services through location awareness has become the focus of future research. [0003] Outdoor positioning generally uses GPS technology, but indoors, due to the occlusion of buildings, the GPS signal will be severely weakened, and affected by the multipath effect, there are problems of difficult positioning and insufficient accuracy. [0004] The current indoor positioning technologies mainly include high-precision GPS positioning, WIFI positioning technology, ZigBee positioning technology, RFID radio frequency technology, inertial navigation technology and UWB technology....

AI Technical Summary

Problems solved by technology

WiFi positioning and ZigBee positioning have large errors and are not suitable for indoor positioning; RFID transmission distance is relatively short, and tags need to be densely distributed, the project is complicated and the cost is high; inertial navigation can work independently without relying on external equipment, but inertial navigation receives drift errors accumulation The impact of long-term or long-distance positioning cannot be carried out

Most of the current UWB positioning uses the signal arrival time for positioning, which needs to achieve clock synchronization between the base station and the tag, and the positioning data is transmitted by the base station to the positioning terminal, which will increase the complexity and cost of the system

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