A method and system for compressing and storing vehicle track points with controllable errors

A vehicle trajectory, compressed storage technology, applied in electrical components, code conversion, etc., can solve problems such as inability to solve pressure, no error avoidance plan, etc., to save storage costs, the compression process is simple and fast, and the storage IO is reduced. Effect

Active Publication Date: 2017-07-25
CHINA MOBILE QUANTONG SYST INTEGRATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing track point storage technology has the following defects: each vehicle generates 2,880 track points per day, and it is estimated that 300,000 vehicles will generate 2,880*300,000=864,000,000 track points per day, with an average of 10,000 track points per second. IO, storage space, and application analysis all put forward very high requirements:
It cannot solve the pressure on storage IO, storage space, and application analysis caused by a large amount of data, nor does it provide any avoidance scheme for errors in the compression process

Method used

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  • A method and system for compressing and storing vehicle track points with controllable errors
  • A method and system for compressing and storing vehicle track points with controllable errors
  • A method and system for compressing and storing vehicle track points with controllable errors

Examples

Experimental program
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Embodiment 1

[0050] Such as figure 1 As shown, it is a flowchart of a preferred embodiment of vehicle track point compression storage, including receiving new track points and loading old track points. The method further includes judging whether the track points can be merged, and completing the merging of track points that can be merged , where judging whether the trajectory points can be merged includes the following steps:

[0051] Traverse the corresponding index items of the old and new trajectory points;

[0052] Judging whether the corresponding index items are the same, if the indexes are different, the step ends, and if the indexes are the same, judging whether there is a next index;

[0053] If the next index exists, then continue to traverse the corresponding index items of the old and new track points, if the next index does not exist, then carry out the merging of the track points, the merging of the track points includes the following steps:

[0054] Apply for a track point...

Embodiment 2

[0065] In the actual data compression process, the vehicle-mounted terminal often produces errors, resulting in continuous changes in the collected trajectory points, and a large number of trajectory points cannot be merged. The error is usually caused by the positioning accuracy of the vehicle-mounted terminal, the strength of the positioning signal, weather and electromagnetic interference, etc. factors. Taking the vehicle in the closed state as an example, typical errors such as position drift, speed drift, and direction drift often occur, such as image 3 As shown, this embodiment provides a technical solution for using the position drift module to determine whether there is an error in the indicator when the vehicle is closed. If there is an error in the indicator during the judgment process, that is, the track points that can be merged are not merged due to the existence of the error, then the track points will be merged. If the judgment result is not caused by the error...

Embodiment 3

[0076] Such as Figure 4 As shown, this embodiment provides a technical solution for using the speed drift module to determine whether there is an error in the index when the vehicle is in a closed state. If there is an error in the indicator during the judgment process, that is, the track points that can be merged are not merged due to the existence of the error, then the track points will be merged. If the judgment result is not caused by the error, the process ends. Among them, the speed drift: the speed is greater than zero in an instant, and then returns to zero. The current speed of some vehicle-mounted terminals is calculated according to the positioning coordinates, rather than obtained by the vehicle-mounted computer, so once the position drifts greatly, the speed will also follow. increase.

[0077] If the on-board equipment reads the speed value of the trip computer, it is not considered to be speed drift. If the value is calculated by positioning, if the error ra...

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Abstract

The invention provides an error-controllable vehicle track compression storage method and an error-controllable vehicle track compression storage system. The method comprises the steps of receiving a new track point and loading an old track point, judging whether the track points can be merged or not, and completing merging of the track points which can be merged. The judgment on whether the track points can be merged or not comprises the following steps: traversing corresponding indexes of new and old track points; judging whether the corresponding indexes are the same, ending the step if the indexes are not the same, and judging whether next index exists if the indexes are the same; and continuing traversing corresponding indexes of the new and old track points if next index exists, and merging the track points if next index does not exist. The merging of the track points comprises the following steps: applying a track pint structure; copying all index values of the track point; and updating the time coverage of the track point. By adopting the scheme, the storage space of a database is reduced, the storage cost is saved, and the capital investment and the storage IO and system design difficulty are lowered. Meanwhile, error judgment is made for different vehicle track points, and the problem that merging and compressing cannot be carried out in the process of track point judgment due to index error is avoided.

Description

technical field [0001] The invention relates to the field of data compression, in particular to a method and system for compressing and storing vehicle track points with controllable errors. Background technique [0002] The Chewutong service is a vehicle / personnel position monitoring and scheduling service for group customers using handheld terminals (including mobile phones) that support satellite positioning and base station positioning, or vehicle-mounted terminals installed on vehicles, based on China Mobile's communication network. The vehicle track points collected by Chewutong system not only include the longitude and latitude information of a certain vehicle at a certain moment, but also record the driving direction, mileage, speed, fuel volume, engine and other information of the vehicle. The track point is the basis of the application of the vehicle position. Based on the comprehensive analysis of the relevant parameters of the track point, it can form many applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30
Inventor 牛昆亮孙海涛曹雪峰武海斌张轶赵思诺
Owner CHINA MOBILE QUANTONG SYST INTEGRATION CO LTD
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