High-precision local wireless positioning system

Abstract

The invention discloses a high-precision local wireless positioning system which comprises anchor nodes, a positioned destination node and a central processing module, wherein the anchor nodes comprise a vertex anchor node and a central anchor node, the vertex anchor node is allocated on the vertex of a polygon on the edge of a positioned region, the central anchor node is abutted against the central processing module arranged at the center of the polygon, and each anchor node is respectively connected with the central processing module; the positioned destination node is in a sleep state in normal times, and when the node needs to be positioned, the positioned destination node is aroused, emits a wireless signal which is modulated through an ASK (Amplitude Shift Keying) modulator, and then continues to sleep until being aroused the next time; and a plurality of groups of arrival time differences are obtained through the demodulation and phase discrimination processing of the anchor modes on the wireless signal and the relevant operation based on a received signal phase difference, and then the position of the positioned node is determined according to the position relation between the anchor nodes. The invention can realize the high-precision positioning within a local range (100-meter radius), and the power consumption of the positioned destination node is low.

Description

technical field [0001] The invention relates to a local wireless positioning system, in particular to a high-precision local wireless positioning system capable of realizing high-precision positioning within a local range (100-meter radius) and having low power consumption of a positioned target node. Background technique [0002] At present, wireless positioning systems are widely used in industrial automation, military target positioning, logistics asset tracking, underground positioning, and dangerous environment target tracking. [0003] The existing local positioning systems are: based on time of arrival (TOA), based on time difference of arrival (TDOA), based on angle of arrival (AOA), based on signal strength (RSSI) and interferometric positioning systems. The above positioning systems have their own defects. For example, the TOA and TDOA schemes need to measure the arrival time of the signal, but because the wireless signal propagates at the speed of light in the air...

AI Technical Summary

Problems solved by technology

The above positioning systems have their own defects. For example, the TOA and TDOA schemes need to measure the arrival time of the signal, but because the wireless signal propagates at the speed of light in the air, the propagation time is short in a local area, and it is difficult to measure directly; TOA using UWB technology The scheme has high precision, but the wireless propagation distance is about 10 meters, and its application is limited; the AOA scheme requires a complex antenna array structure, which is not suitable for local positioning applications; the RSSI scheme has a simple structure, but is greatly affected by noise and has low precision; Interferometric positioning has high accuracy, but the positioning time is long, and it is only suitable for stationary nodes

To sum up, there is currently no wireless positioning system that can achieve high-precision positioning within a local area (100-meter radius)

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