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Method for checking train integrity based on GPS and dummy satellite combined positioning

A technology of virtual satellite and combined positioning, which is applied in positioning, railway vehicle testing, and beacon systems using radio waves, etc., and can solve problems such as limitations

Inactive Publication Date: 2010-01-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The train integrity inspection system based on satellite positioning is realized by real-time positioning and calculating the length of the train head and train tail. The number of visible satellites received at the tail is less than four, and conventional satellite positioning methods are limited

Method used

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  • Method for checking train integrity based on GPS and dummy satellite combined positioning
  • Method for checking train integrity based on GPS and dummy satellite combined positioning
  • Method for checking train integrity based on GPS and dummy satellite combined positioning

Examples

Experimental program
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Embodiment

[0053] 1. Collect the ephemeris and pseudo-range data of visible satellites, and receive the front information (such as image 3 As shown), use the GPS receiver to collect the pseudorange and ephemeris data of visible satellites, and receive the longitude, latitude and elevation information output by the train head receiver through the train information transmission system.

[0054] 2. Calculate visible satellite coordinates;

[0055] 3. Error correction for satellite coordinates and pseudoranges

[0056] Considering the practicability, the invention corrects the error of the earth rotation effect, the time error of satellite signal transmission and the error of relativity for the error of the satellite coordinate and the pseudo-range.

[0057] 4. Create a virtual satellite through the front information

[0058] figure 2 As shown, the spatial geodetic coordinates are attached to the reference ellipsoid. In order to establish the mathematical relationship between geodetic ...

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Abstract

The invention belongs to the vehicle positioning technical field, in particular relates to a method for positioning and examining integrity of trains on the basis of combining GPS and virtual satellite. Under the condition that satellite signal which is received by GPS receiver on the rear portion of a train is incomplete, namely when the number of the satellite is three, longitude, latitude and altitude information which are output by the GPS receiver on the upper part of engines of the head portion of the train are used to provide the virtual satellite for positioning the rear portion of the train, and a fourth constraining equation is established to realize positioning resolve of the rear portion of the train. The invention can still examine the integrity of trains under the condition that the satellite signal which is received by the GPS receiver on the rear portion of the train is incomplete, which guarantees driving safety of the train.

Description

technical field [0001] The invention belongs to the technical field of vehicle positioning, in particular to a method for checking train integrity based on GPS and virtual satellite combined positioning. Background technique [0002] Since the train carriages are connected to each other by hooks, the inspection to ensure the integrity of the train is called the train integrity inspection to ensure that the train does not derail or decouple. The train integrity check is a key link related to the safety of the railway system. If the train integrity check fails, the vehicles left on the section or track will become obstacles to the follow-up trains, directly endangering the traffic safety. [0003] At present, one of the commonly used train integrity inspection methods is to install a safety protection device (referred to as the train tail device) at the tail of the train. The train tail device communicates with the locomotive on-board device of the train through the locomotiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/00G01S1/02G01S5/02G01M17/08
Inventor 蔡伯根安毅惠希云王剑
Owner BEIJING JIAOTONG UNIV