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Floating car map matching data preprocessing method and system

A data preprocessing and map matching technology, which is applied in the traffic control system of road vehicles, traffic control systems, instruments, etc., can solve problems such as inaccurate heading angles, and achieve the effect of improving accuracy and matching performance

Inactive Publication Date: 2014-04-16
BEIJING WATCH DATA SYST
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Problems solved by technology

The method and system can use GPS historical positioning data to solve the problem of inaccurate course angle when the vehicle is running at low speed, and the drift problem of GPS positioning data when the vehicle is stationary, thereby improving the accuracy and performance of map matching, so as to correctly map The positioning data is matched to the corresponding road section and the congestion analysis is performed to provide comprehensive positioning technical support for urban road congestion charging

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  • Floating car map matching data preprocessing method and system
  • Floating car map matching data preprocessing method and system
  • Floating car map matching data preprocessing method and system

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0053] Such as figure 1 As shown, a floating car map matching data preprocessing method for urban road congestion analysis includes the following steps:

[0054] S1, Step 1: Initialize the system parameters;

[0055] S2, Step 2: Receive GPS positioning data, gyroscope and accelerometer data, and extract GPS velocity V_GPS, the angular rate value G_Ang of the heading angle measured by the gyroscope, and calculate the difference Acc between the accelerometer measurement value and the gravity acceleration g;

[0056] S3, Step 3: Determine whether it is the first positioning, if it is the first positioning, update the positioning data, assign the current positioning data (longitude and latitude) to BL_Cache (Len_Cache), end the preprocessing, otherwise continue to the subsequent steps;

[0057] S4, Step 4: Determine whether the vehicle is stationary, if it is, keep the p...

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Abstract

The invention relates to a floating car map matching data preprocessing method and system. The method provided by the method comprises the following steps: carrying out initialization setting on system parameters; receiving GPS (global positioning system) positioning data and data of a gyroscope and an accelerometer, extracting the GPS speed and the angular rate value of a course angle measured by the gyroscope, and calculating the difference value of the measurement value of the accelerometer and the gravity acceleration g; and judging whether the positioning is carried out for the first time, judging whether a car is static and whether the car runs slowly, and updating the positioning data according to the determined situation and the like. By adopting the method and the system which are provided by the invention, the problem that inaccurate course angle when the car runs at low speed can be solved by the GPS historic positioning data and the drifting problem generated by the GPS positioning data when the car is static can be solved, thereby improving the map matching precision and the matching performance so as to match the positioning data to a corresponding road segment correctly and perform congestion analysis, and a comprehensive positioning technical support is provided for the urban road congestion charge.

Description

Technical field [0001] The invention belongs to the technical field of intelligent transportation vehicle-mounted positioning, and particularly relates to a floating car map matching data preprocessing method and system used for urban road congestion analysis. Background technique [0002] The urban road traffic congestion analysis technology based on GPS floating car is considered to be an important way to realize advanced traffic guidance. As a new detection method based on GPS floating car traffic parameter detection technology, how to improve its detection performance is the current core issue. Urban road congestion analysis mainly includes floating car GPS positioning data acquisition, map matching, road section traffic status, road network congestion calculation, and traffic decision-making. [0003] The Global Positioning System (GPS) provides real-time, all-weather and global navigation services, and can provide vehicle positioning, driving route monitoring and other functi...

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Application Information

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IPC IPC(8): G01C21/26G08G1/01
CPCG01C21/30G08G1/0112G01C21/165
Inventor 余振华
Owner BEIJING WATCH DATA SYST
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