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Railway-line worker-train positioning predicting and fragment-based caching strategy

A caching strategy, railway line technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc.

Inactive Publication Date: 2017-09-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] However, in the existing railway applications based on WebGIS, the efficiency of real-time tracking and positioning of moving targets needs to be further improved

Method used

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  • Railway-line worker-train positioning predicting and fragment-based caching strategy
  • Railway-line worker-train positioning predicting and fragment-based caching strategy
  • Railway-line worker-train positioning predicting and fragment-based caching strategy

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Embodiment Construction

[0052] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the specific processing flow and accompanying drawings.

[0053] like figure 2 As shown, a positioning process can refine the basic step A2 into steps C1-C5:

[0054] C1, the database hits the cache block. The OGC specification defines the relational functions of simple feature geometric objects. According to the characteristics that geographic information databases can process spatial data, it can be judged whether a geometric point is inside a geometric figure. The incoming person (or car) GPS position information is used as a geometric point P, and the cache block graphic record containing point P is queried in the database, that is, the nearest cache block Buffer is located. It should be noted that when the point P is in a densely populated railway line, the cache block obtained by the query ...

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Abstract

The invention discloses a railway-line worker-train positioning predicting and fragment-based caching strategy, and relates to the field of smart traffic. The strategy is characterized in that the fragment-based caching type positioning predicting strategy is realized through spatial data processing in WebGIS-based railway application; the GPS real-time positions of workers or trains in a railway line can be positioned on a railway kilometer post, so that the positions can be marked. The strategy mainly comprises the following steps: constructing a caching block graph, namely, storing valid railway information into the caching blocks by fragments; loading and maintaining the caching blocks, namely, loading the caching blocks assigned by the GPS position in a cache, and maintaining the caching blocks in the cache on the basis of the use condition; predicting the caching blocks, namely, predicting the caching block which is possibly assigned in the next time, and loading and maintaining the caching block; and maintaining a caching pool, namely, storing the caching blocks in the caching block pool of the cache, wherein the use state information is stored in the caching block pool and cleaned on demand. With the adoption of the strategy, the system function completeness is ensured, and the moving target positioning efficiency is improved.

Description

technical field [0001] The invention designs the field of intelligent transportation, and in particular relates to an application system based on railway WebGIS. Background technique [0002] From 1976 when Academician Peng Peng mentioned the concept of Geography Information System (GIS for short) at a domestic academic conference for the first time, to the current map software that is available to everyone, GIS has gradually covered cities and natural resource management in China with many aspects of service. As a combination of Internet technology and traditional geographic information industry, WebGIS has largely promoted the popularization of GIS. [0003] The earliest map unearthed in my country is a military defense map of the Western Han Dynasty. Purely static maps have lost a lot of value in the Internet age. The convenience of information exchange has turned the focus of the entire society to the real-time and effectiveness of information. Taking the urban traffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06F3/06G01S19/42
CPCG01S19/42G06F3/064G06F3/0656G06F16/29
Inventor 詹瑾瑜桑楠郭新杨峻欢王峻龙李一心刘俊男
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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