A map matching method and system based on floating vehicle satellite positioning data
A technology of satellite positioning and map matching, which is applied in traffic control systems of road vehicles, traffic control systems, electrical digital data processing, etc., and can solve problems such as matching accuracy or performance degradation, map matching accuracy deterioration, and performance deterioration. Achieve the effect of improving accuracy and matching performance
Inactive Publication Date: 2017-10-27
WATCHDATA SYST
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Problems solved by technology
[0005] However, map matching often encounters the following problems: first, there is a large error in the heading angle of the vehicle when driving at a low speed; second, there is a large drift in the positioning when the vehicle is stationary; prone to match errors
The existing map matching technology has not fully considered and dealt with the above problems, which will lead to poor map matching accuracy, poor performance, and even wrong results
[0006] When the ordinary semi-deterministic matching method is used in the map matching calculation, the matching accuracy or performance will be reduced, and even wrong matching results will be generated, resulting in wrong results in road congestion analysis
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[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0062] Such as figure 1 As shown, the specific embodiment of the present invention provides a kind of map matching method based on floating car satellite positioning data, comprises the following steps:
[0063] Step 1: Initialize the system parameters, including:
[0064] 1) Set the speed static threshold value V_Static, the value range of V_Static is 0-2km / h;
[0065] 2) Set the speed low speed threshold value V_Low, the value range of V_Low is 2-30km / h;
[0066] 3) Set the distance threshold S_Lmt from the positioning point to be matched to the road section node, and the value range of S_Lmt is 50-200 meters;
[0067] 4) Set the positioning point to be matched ...
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The invention relates to a map matching method and a map matching system based on floating car satellite positioning data, which belong to the technical field of intelligent transportation vehicle positioning. The technical solution of the invention includes two aspects, i.e. the identification of candidate road sections and the determination of the location of a vehicle on a chosen road section; by setting system parameters, such as a vehicle rest threshold, the distances between a positioning point and road section nodes and a threshold of the differences between the heading angle of the positioning point and the heading angles of roads, whether the vehicle is in a resting state is judged, candidate road sections are correctly chosen, in particular, the candidate road sections are compared, judged and determined by utilizing the thresholds provided by the solution and the given steps at an intersection, and thereby the failure of matching caused by misjudgment is prevented. The adoption of the method and system described by the invention can reduce the error of the heading angle of a vehicle running at low speed and great excursion during resting during satellite positioning, prevents the problem that the error of matching can easily take place when a plurality of road sections exist at an intersection, and can increase the precision of map matching and the performance of matching.
Description
technical field [0001] The invention relates to the technical field of intelligent traffic vehicle positioning, in particular to a map matching method and system based on floating vehicle satellite positioning data for urban road traffic congestion analysis. Background technique [0002] Urban road traffic congestion analysis technology based on floating car satellite positioning data (FCD, Floating Car Data) is considered to be an important way to achieve advanced traffic guidance. Traffic parameter detection technology based on floating car satellite positioning data is a new detection method. How to improve its detection performance is the core problem at present. Urban road congestion analysis mainly includes floating vehicle satellite positioning data acquisition, map matching, road section traffic status and road network congestion calculation, traffic decision-making, etc. [0003] Satellite positioning systems include the GPS global positioning system of the United ...
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IPC IPC(8): G06F19/00G08G1/01G08G1/065
Inventor 余振华
Owner WATCHDATA SYST