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Method and device for generating GPS trajectory curve

A trajectory curve and curve generation technology, applied in the field of GPS, can solve the problems of wasting server storage space, affecting the quality of curve display, redundancy, etc., and achieve the effect of eliminating zero-point drift problem, good display effect, and reducing redundant information.

Inactive Publication Date: 2014-05-21
INNO INSTR (CHINA) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing methods for displaying historical trajectories have the following defects: when the positioning terminal has a slight jitter or a slight displacement change in place, the server will receive a large amount of redundant information, especially when the GPS terminal is stationary, the GPS coordinate information has drift problems
Displaying these drift points in the trajectory curve will not only affect the display quality of the curve, but also waste server storage space

Method used

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  • Method and device for generating GPS trajectory curve
  • Method and device for generating GPS trajectory curve
  • Method and device for generating GPS trajectory curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] like figure 1 Shown, a kind of generation method of GPS trajectory curve, comprises the steps:

[0039] Step S1, GPS location point acquisition step: continuously obtain several GPS location points from the GPS system in real time; wherein, each GPS location point corresponds to a time value, a speed value, an accuracy value, an angle value and a two-dimensional coordinate value.

[0040] In the above parameters corresponding to the GPS location point, the time value refers to the current moment when the GPS location point is obtained, the speed value refers to the current movement speed corresponding to the GPS location point when it is obtained, and the accuracy value refers to the GPS location The GPS positioning accuracy range corresponding to the point, the angle value refers to the corresponding current movement direction angle when the GPS location point is obtained, and the two-dimensional coordinate value refers to the corresponding current position on the two-...

Embodiment 2

[0051] This embodiment provides a method for generating a GPS track curve. Compared with Embodiment 1, the difference lies in that the filtering condition includes the second filtering condition and does not include the first filtering condition.

[0052] The second filtering condition: For a group of calibration objects, calculate the angle change between two adjacent GPS position points, if all the angle changes are greater than 90°, then the processing point in the current calibration object is a drift point.

[0053] Among them, the calculation method of the angle change is as follows: among two adjacent GPS position points, set the angle value corresponding to the previous GPS position point as θ 1 , the angle value corresponding to the latter GPS position point is θ 2 , the angle change between the two adjacent GPS position points is the angle value θ 1 with angle value θ 2 The absolute value of the difference between.

[0054] Specifically, there are three consecutiv...

Embodiment 3

[0058] This embodiment provides a method for generating a GPS track curve. Compared with Embodiment 1, the difference is that the filtering conditions include the third filtering condition and do not include the first filtering condition.

[0059] The third filter condition: For a group of calibration objects, calculate the straight-line distance between two adjacent GPS position points according to the corresponding two-dimensional coordinate value, and calculate the distance between two adjacent GPS position points according to the weighted average speed and GPS time difference Theoretical distance, if each theoretical distance is less than the corresponding straight-line distance, the processing point in the current calibration object is a drift point.

[0060] In this filter condition, the reason for using weighted average speed is that the respective speed values ​​of two adjacent points have different effects on the average speed between the two points, and it is necessar...

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Abstract

The invention discloses a method for generating a GPS (Global Positioning System) trajectory curve. The method comprises a step of obtaining a GPS location point, a step of selecting a correction object, a step of screening drift points and a step of generating a curve, wherein the step of selecting the correction object comprises determining according to a predetermined processing point condition and selecting the desired correction object, and the step of screening the drift points comprises determining according to a predetermined screening condition, determining whether the processing point in the current correction object is the drift point and filtering out all the processing points screened out when generating the curve. Compared with the prior art, the method has the advantages that sampling points are screened so that redundant information is greatly reduced and the storage space of a server is saved, and a specific screening method is used for processing so that the GPS historical trajectory curve can be well displayed.

Description

technical field [0001] The invention belongs to the technical field of GPS, and in particular relates to a method and a device for generating a GPS track curve. Background technique [0002] GPS (Global Positioning System) refers to the global positioning system, that is, a system that uses GPS positioning satellites to perform real-time positioning and navigation around the world. At present, GPS technology has been widely used in various fields. The GPS system has the function of displaying the historical trajectory, that is, the GPS system is used to obtain the location information of the positioning terminal in real time, and display the historical location trajectory of the positioning terminal on the map according to the obtained location information. In the prior art, when acquiring location information, a method of multiple consecutive uploads at a certain time interval is usually adopted, that is, the GPS module installed in the positioning terminal uploads the loc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/42G01D1/00
CPCG01S19/37G01S19/40
Inventor 李胜
Owner INNO INSTR (CHINA) INC
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