An auxiliary positioning system and method based on CAN bus

Abstract

The invention discloses an assisted positioning system and method based on a CAN (Controller Area Network) bus, belonging to the technical field of vehicle positioning. The assisted positioning system comprises a CAN bus of a vehicle, a CAN protocol interpreter and a vehicular terminal, wherein one end of the CAN protocol interpreter is connected with the CAN bus through a vehicular diagnosis system OBD interface of the vehicle, and the other end of the CAN protocol interpreter is connected with the vehicular terminal. According to the assisted positioning system, the vehicular terminal acquires vehicle travel parameters of the vehicle from the CAN bus through the CAN protocol interpreter, and a vehicle travel track can be reckoned according to the vehicle travel parameters. The assisted positioning system and method are applied to the vehicular terminal by using speed and travel direction information carried on the CAN bus of the vehicle instead of a traditional gyroscope and a traditional acceleration sensor to realize the reckoning of the vehicle travel track, and the assisted positioning precision is also increased while the equipment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of vehicle positioning, in particular to a CAN bus-based auxiliary positioning system and method. Background technique [0002] Vehicle location information is an important element in realizing intelligent transportation, such as navigation, traffic control, toll collection, etc. With the continuous development of positioning technology, the requirements for positioning accuracy are getting higher and higher. The positioning results need to distinguish between main roads and auxiliary roads, bridges and bridges. Satellites and base stations have become the basic technical means of vehicle positioning. However, due to the complex and changeable road environment where vehicles drive, when there is no signal coverage or the signal is blocked and reflected, uninterrupted and accurate positioning cannot be achieved, and other positioning technologies must be assisted. [0003] Dead reckoning is a commonly used a...

AI Technical Summary

Problems solved by technology

Satellites and base stations have become the basic technical means for vehicle positioning. However, due to the complex and changeable road environment where vehicles drive, when there is no signal coverage or the signal is blocked and reflected, uninterrupted accurate positioning cannot be achieved, and other positioning technologies must be assisted.

[0003] Dead reckoning is a commonly used auxiliary positioning technology, that is, according to the current position of the vehicle, with the help of driving speed (including speed and direction), the vehicle's position after a period of time is inferred, so speed, direction, and time are the three elements of dead reckoning , the time is generally realized by the timer inside the vehicle terminal, but there are different acquisition methods for the speed and direction. The traditional method is to use the gyroscope sensor to obtain the driving direction, and the acceleration sensor to obtain the speed (with the initial speed as a reference). The position of the vehicle is estimated by the integral of time and speed, but the cost of equipment in this estimation method is relatively high, and the positioning is not very accurate

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