Automatic update method and device for wireless indoor positioning fingerprint map

Abstract

The invention provides a method of automatically updating a wireless indoor positioning fingerprint map and a device. The method comprises steps: signal fingerprints at all acquisition points inside a positioning place are acquired, an initial fingerprint map is built according to the signal fingerprints, and a mobile device as a mobile reference point is arranged in the positioning place; when the mobile device is motionless, signal fingerprint data and route information are collected, and according to the signal fingerprint data and the route information, the position when the mobile device is motionless is determined; with the position when the mobile device is motionless as the current reference point, according to the initial fingerprint map, the mapping relationship between signal fingerprint data on the non-reference point and the reference point is determined; and according to the mapping relationship and the signal fingerprint data on the reference point, fingerprint data on the non-reference point are determined. The method of automatically updating the wireless indoor positioning fingerprint map can be carried out in a non-peak period or non-service time of the positioning service, is small in calculation amount and high in precision, and positioning service at the normal time period is not influenced.

Description

technical field [0001] The invention relates to the field of wireless networks, in particular to a method and device for automatically updating wireless indoor positioning fingerprint maps. Background technique [0002] Indoor positioning technology has been developed rapidly and has a wide range of applications in the past decade. For example, various positioning technologies such as WIFI positioning technology, radio frequency identification (Radio Frequency Identification, RFID for short) positioning technology, and sound positioning technology have been proposed. Among them, due to the wide coverage of WIFI networks, WIFI-based indoor positioning technology has become one of the most important and most applicable technologies. WIFI indoor positioning usually adopts a method based on wireless signal fingerprints, which includes two stages: the site survey stage, that is, to record the fingerprint characteristics of wireless signals at each position in the positioning spa...

AI Technical Summary

Problems solved by technology

RSSI is highly susceptible to environmental changes, including changes in weather conditions such as moving objects, door and window switches, light, temperature, and humidity, etc., which may cause changes in RSSI. The multipath effect in complex indoor environments further aggravates the timing of RSSI. In this way, the RSSI collected in real time during the positioning phase may have deviated greatly from the wireless signal fingerprints collected during the initial deployment phase in the fingerprint database

During long-term deployment and operation, the static fingerprint database will gradually become invalid over time, resulting in inaccurate positioning results

[0004] The most intuitive method for inaccurate positioning results is to perform on-site surveys regularly and repeatedly to maintain the latest fingerprint database, but due to the laborious on-site surveys and the low feasibility of this method, it is not suitable for large-scale promotion

Deploy a certain number of fixed reference points in the positioning environment, and update the entire fingerprint database through the latest data reported by these reference points. Deploying additional reference points requires high cost and is difficult to promote, so it is not suitable for large-scale promotion.

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