Vehicle-mounted Bluetooth positioning system and positioning method thereof

Abstract

The invention discloses a vehicle-mounted Bluetooth positioning system and a positioning method thereof, and relates to the field of Bluetooth positioning, the positioning system comprises a user mobile device terminal, a vehicle-mounted Bluetooth terminal and four Bluetooth beacon anchor points arranged in a rectangular shape on a vehicle body; the Bluetooth beacon anchor point and the vehicle-mounted Bluetooth terminal are connected to a vehicle-mounted network. The positioning method comprises the following steps of enabling Bluetooth beacon anchor points to respectively send RSSI (ReceivedSignal Strength Indicator) outwards, collect other RSSI and send the RSSI to a user mobile equipment terminal; after the user mobile equipment terminal collects RSSI of the Bluetooth beacon anchor point, filtering RSSI data; calculating the calculation distances between the anchor points and between the anchor points and the user mobile equipment terminal, calculating a correction factor according to the actual distances between the anchor points, and correcting the calculation distances; and establishing a coordinate system, and performing positioning by using a double-triangle centroid positioning algorithm to obtain the position of the user mobile device. The system and the method have the advantages of being simple in hardware topological structure, small in required calculation datasize, high in real-time performance, small in external environment influence, accurate in 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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