Indoor position fingerprint locating method based on FM and DTMB signals

Abstract

The invention discloses an indoor position fingerprint locating method based on FM (frequency modulation) and DTMB (Digital Terrestrial Multimedia Broadcast) signals. The method comprises the steps: selecting sampling points according to an indoor environment, selecting different frequencies of the FM and DTMB signals as reference frequencies, recording the intensity information of signals at the reference frequencies of all sampling points, and constructing an RSSI (receiving signal strength indication) fingerprint database; obtaining the RSSI fingerprint information of FM and DTMB signals of a to-be-located point, and carrying out the matching of optimal position information according to a combined positioning algorithm. According to the invention, the method employs the FM and DTMB signals with the stable intensity as the positioning signals, is wide in coverage, and is low in maintenance cost. Different frequencies are employed as the reference, thereby overcoming the impact on the positioning precisions from the motion of a person and an object, and improving the anti-interference capability of a system. The combined positioning algorithm improves the diversity of positioning information, effectively counteracts a part of errors, and achieves the indoor high-precision positioning.

Description

technical field [0001] The invention relates to a high-precision positioning method for determining the indoor environment space position by using position fingerprints based on FM and DTMB signals. Background technique [0002] At present, with the rapid development of wireless communication technology and the popularization of smart mobile terminals, location-based services (LBS) are also developing continuously. In outdoor situations, the satellite positioning system (GNSS) has become the mainstream positioning technology due to its advantages of high precision (generally, the typical error does not exceed 10m) and low cost. In terms of indoor positioning, due to building occlusion, multipath interference, and low GNSS signal strength, satellite positioning technology based on time of arrival or angle of arrival will produce large multipath errors in indoor positioning. In an indoor environment, each point in the space has a unique signal strength corresponding to it. T...

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Problems solved by technology

[0006] In view of the defects of the above-mentioned various methods, the present invention proposes an indoor position fingerprint positioning method based on FM and DTMB signals, which overcomes the limitations and instability of traditionally using Wi-Fi signals for positioning, and solves the problem of using FM signals as The problem of low accuracy of a single positioning signal, to achieve indoor high-precision positioning

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