Indoor positioning device and method based on environmental spectral fingerprint

Abstract

The invention provides an indoor positioning device based on an environment spectrum fingerprint. The device comprises a spectrum measurement module, a central control module and a wireless module. The central control module receives spectrum data measured by the spectrum measurement module, and controls the measurement state of the spectrum measurement module. The wireless module is controlled by the central control module and wirelessly transmits the spectrum data or spatial point coordinates to the outside world. The spectrum measurement module has a first measurement state and a second measurement state. When the spectrum measurement module is in the first measurement state, the central control module constructs the received spectrum data of all spatial points into the spectrum fingerprint according to spatial position and the light intensity of each spatial point. In the second measurement state, the measured data are compared with the spectrum fingerprint, so as to acquire the position information of a terminal. The positioning device provided by the invention can be applied to an environment without external signal communication, and has the advantages of simple overall result, low cost and high measurement accuracy.

Description

technical field [0001] The invention relates to the field of positioning, in particular to an indoor positioning device and method based on environmental spectrum fingerprints. Background technique [0002] With the popularization of information and communication technology, people's demand for indoor positioning services is increasing day by day. In some public places, such as shopping malls, airports, exhibition halls, office buildings, warehouses, underground parking lots, etc., accurate indoor positioning information can facilitate users to shop, Travel, find indoor targets, etc.; be able to efficiently manage available space and inventory materials; be able to complete specific indoor navigation tasks for police, firefighters, soldiers, and medical staff. In addition, smart spaces and ubiquitous computing are inseparable from indoor location services, so indoor positioning has broad application prospects. [0003] Research on indoor positioning technology at home and a...

AI Technical Summary

Problems solved by technology

The matching method based on WiFi fingerprint can obtain better positioning accuracy by using the signal feature matching in the indoor environment, but the positioning result is easily affected by indoor multipath effects and environmental changes.

The multilateral / angle method needs to accurately measure the distance / angle and other information from the positioning point to the reference point through algorithms such as time of arrival algorithm (TOA), time difference of arrival algorithm (TDOA), and angle of arrival algorithm (AOA), and then use trilateral measurement However, in actual measurement, there will be errors in data values ​​such as reference node position coordinates and measurement distances, which will affect the positioning results

[0004] The patent application number CN201410539385.9 proposes an adaptive dynamic fingerprint library construction method based on LED visible light indoor positioning system. The number of different LED light sources is relatively small, that is, it is likely that only two or even one LED light source information can be measured at a position point. In this case, the receiver cannot determine the position of the receiver only based on the light source and its light intensity information. If If it is necessary to effectively locate all positioning points (such as corridors, etc.), LED light sources need to be densely arranged, but this will increase the cost of the solution

[0005] The patent application number CN201110054768.3 proposes a weighted trilateration positioning method based on RSSI. The limitation is that this method cannot accurately measure the distance between nodes, resulting in a large positioning error

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