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Research method on impacts of environmental factors on vehicle-mounted GPS positioning errors

A technology of GPS positioning and environmental factors, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as positioning errors, affecting the accuracy and efficiency of data matching of floating vehicles, and achieve high data accuracy , the effect of improving the overall accuracy

Inactive Publication Date: 2015-12-09
SUN YAT SEN UNIV
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Problems solved by technology

[0005] However, the complex urban environment will cause the floating car to generate positioning errors when collecting data. The positioning error is one of the main parameters for map matching of floating car data. This value has a great impact on the accuracy of map matching and directly affects the floating car data. Matching Accuracy and Matching Efficiency

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  • Research method on impacts of environmental factors on vehicle-mounted GPS positioning errors
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  • Research method on impacts of environmental factors on vehicle-mounted GPS positioning errors

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0028] The data used in the present invention is collected on July 6, 2013, all the data of 1,485 floating vehicles in Guangzhou City, with a total of 508,511 pieces. The data range covers Baiyun District, Huangpu District, Liwan District, Yuexiu District, Guangzhou City. Tianhe District, Haizhu District. The specific operation steps are:

[0029] Step 1: Process the original floating car data and delete invalid data. In the process of collecting and uploading the GPS data of the floating car, signal distortion sometimes occurs, resulting in invalid data. The invalid data cannot correctly reflect the road traffic operation status, so it should be deleted. Invalid data includes the following types:

[0030] One is data with incomplete information. A complete piece of floating car data needs to in...

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Abstract

The invention puts forward a research method on the impacts of environmental factors on vehicle-mounted GPS positioning errors. The method comprises the following steps: first removing ineffective floating vehicle data by processing and analyzing large-scale floating vehicle data; subsequently based on road sections which the floating vehicle data belong to, calculating a positioning error value of each data point; then dividing the floating vehicle positioning error values into three grades, based on the grades of the errors, utilizing the Kriging interpolation method to construct an error distribution map, and selecting data points far away from the road sections within deep color areas of the error distribution map as research objects; finally determining the position of each data point selected on an electric map, and with each data point as a center, searching within a range area with a semi-diameter r for geographical factors, and determining the type of the environmental factors based on the searched result. The research result can provide reference basis for increasing the GPS positioning precision of floating vehicles in urban environment.

Description

Technical field [0001] The invention involves the field of traffic planning and application technology, and more specific, it involves a research method that affects the impact of environmental factors on the positioning error of vehicle GPS. Background technique [0002] When the car GPS positioning device is sent to the signal, if there are complex reflexes around the receiver, the satellite signal will also be disturbed by the reflex signal, which deviates the positioning result, which will generate a positioning error.This error is different from the changes in the surrounding environment, and it is difficult to eliminate it by methodic.When floating vehicles are driving on high -rise urban sections, the complex environment in cities will have greater impact on positioning accuracy.The influence is mainly reflected in two aspects: first, the high -densely built buildings, vagram, and overpass bridges will cause multi -path effects; second, when the floating vehicle passes thr...

Claims

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Application Information

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IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 李军游弋
Owner SUN YAT SEN UNIV
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