DATA PRE-PROCESSING METHOD AND SYSTEM FOR MAP MATCHING OF FLOATING VEHICLE

摘要

The present invention relates to a data pre-processing method and system for the map matching of a floating vehicle. The method of the present invention comprises the following steps: conducting initialization setting on a system parameter; receiving GPS positioning data and data of a gyroscope and an accelerometer, and extracting a GPS speed, and an angular rate value of a heading angle measured by the gyroscope, and calculating a difference Acc between a measured value of the accelerometer and an acceleration of gravity g; and judging whether it is the first positioning, judging whether a vehicle is in a static state, and judging whether the vehicle is travelling at a low speed, and conducting update of positioning data and other operations according to the judgement conditions. By means of the method and system of the present invention, by using historical positioning data of a GPS, the problem of inaccurate heading angle when a vehicle is travelling at a low speed and the problem of shift of the positioning data of the GPS when the vehicle is in a static state can be solved, thereby improving the accuracy of map matching and matching performance, so as to correctly match the positioning data onto a corresponding road segment and conduct congestion analysis, thereby providing comprehensive positioning technology support for urban road congestion charging.