Real time map-matching method and system based on relative coordinates positioning

Abstract

This invention relates to the orientation / navigation technique field of the remove set, its aim is that it provides a sort of real-time map matching method and system which bases the relative coordinate orientation. It resolves the technical problem that the map data is insecurity and the traffic is high in the existing technique. Its realized project is that: Append a judgement unit of the reference point in the customer end which is used for dividing the absolute coordinates into the coordinate of the reference point and the coordinate of the non-reference point. For the coordinate of the reference point, the customer end sends it to the server and progresses emendation and / or encrypting disposal in order to create the coordinate of the reference point which can match. For the coordinate of the non-reference point, the relative fixed coordinate which is used for the map matching is calculated and obtained by the customer end according to a latest reference point and a reference point which can match. This invention depresses greatly the communication frequency between the customer end and the server, and reduces the network traffic. In the precondition that ensure the security of the encrypting arithmetic, it provides the function of the real-time map matching in the method of high efficient for the car orientation / navigation system.

Description

technical field

[0001] The invention relates to the technical field of positioning / navigation of mobile devices, in particular to a real-time map matching method and system based on relative coordinate positioning. Background technique

[0002] The development and application of GPS-based vehicle positioning / navigation system is being paid more and more attention at home and abroad, and shows huge economic and social benefits. Many vehicle positioning / navigation systems require accurate real-time map matching. Map matching is to compare and match the vehicle position and / or driving trajectory measured by GPS, Dead-Reckoning (DR, Dead-Reckoning) and other methods with the data in the on-board electronic map. Under the premise, the process of matching the output of the vehicle's GPS and / or DR with a large error to the corresponding point on the nearest road with a small error in the electronic map. It is not only beneficial to display the current position of the vehicle on t...

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