A vehicle-mounted bluetooth positioning system and its positioning method

Abstract

A vehicle-mounted Bluetooth positioning system and a positioning method thereof, relating to the field of Bluetooth positioning, the positioning system includes a user mobile device terminal, a vehicle-mounted Bluetooth terminal, and four Bluetooth beacon anchor points arranged in a rectangle on the vehicle body; the Bluetooth beacon anchor point, the vehicle-mounted Bluetooth terminal Access to the vehicle network; the positioning method is as follows: the Bluetooth beacon anchor point sends RSSI to the outside and collects other RSSI, and sends it to the user's mobile device terminal; after the user's mobile device terminal collects the RSSI of the Bluetooth beacon anchor point, it filters the RSSI data ; Calculate the calculated distance between each anchor point and the user's mobile device terminal, calculate the correction factor according to the actual distance between each anchor point, and correct the calculated distance; establish a coordinate system, use the double triangle centroid positioning algorithm for positioning, and obtain the user's movement device location. The invention has the advantages of simple hardware topology, small amount of required calculation data, strong real-time performance, little influence from external environment, accurate positioning and the like.

Description

technical field [0001] The invention relates to the field of Bluetooth positioning, and in detail relates to a vehicle-mounted Bluetooth positioning system and a positioning method thereof which are less affected by external environments and have high positioning accuracy. Background technique [0002] Today, as vehicles are gradually moving towards automation and intelligence, it is a mature technology for users to use mobile APPs to control vehicles to complete specified operations. In order to allow users to have a better experience on this basis, vehicles actively judge user needs based on user behavior. In order to make corresponding measures, this will become more and more popular and diversified. For example, if the vehicle calculates that the distance between the user and a certain car door is getting smaller and smaller, then a certain discriminant algorithm can be used to identify whether to The user is ready to open the door; for another example, when the vehicle ...

AI Technical Summary

Problems solved by technology

In the process of actively judging the user's needs through the change of the user's location similar to the above, in the process of completing operations such as starting the vehicle, opening the door, and opening the trunk, the precise positioning of the user's location is very important, which will directly affect the accuracy of the vehicle's judgment. Affect the user experience

[0003] The existing Bluetooth positioning technology mainly uses the Bluetooth signal strength value (RSSI) for distance measurement, and then performs a rough distance measurement and positioning operation by substituting the measured distance information into the existing signal ranging model. There are many Bluetooth anchor points used, and the calculation speed is insufficient. When the user uses the specified function, the positioning delay is relatively large, and the user experience is greatly reduced.

[0004] As a tool for mobile driving, vehicles may be placed in various environments. Different external environmental factors will have a great impact on Bluetooth signal transmission. Large positioning error

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