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Closed loop test method and system of ground-electronic-unit lineside electronic unit (LEU)

A ground electronic unit, closed-loop testing technology, applied in electrical components, transmission systems, transmission monitoring and other directions, can solve the problem that the amount of information cannot meet the requirements of safe high-speed train running, and achieve the effect of ensuring normal working conditions

Inactive Publication Date: 2013-05-08
BEIJING RAILWAY SIGNAL
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AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of train running speed, only relying on the track circuit to send blockage information to the on-board equipment can no longer meet the requirements of safe high-speed running of the train in terms of information volume. It is necessary to increase the transponder equipment to provide a large amount of fixed and variable information

Method used

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  • Closed loop test method and system of ground-electronic-unit lineside electronic unit (LEU)
  • Closed loop test method and system of ground-electronic-unit lineside electronic unit (LEU)

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Embodiment Construction

[0024] For reference and clarity, descriptions, abbreviations or abbreviations of technical terms used in the following text are summarized as follows:

[0025] The C interface is the data transmission interface between the LEU and the active transponder, and is used to transmit messages to the active transponder. The C interface transmits the baseband signal, and the LEU converts the 1023-bit transponder transmission message into a code pattern, that is, the original 1, 0 mode, and converts it into a DBPL code, that is, a two-phase differential level code, and converts it into a DBPL code. Transmits uninterrupted to active transponders via cable. Connect the 120Ω resistive load at the LEU output terminal, the signal amplitude Vpp is 14v ~ 18v, and the average data transmission rate is 564.48kbit / s.

[0026] The S interface is the communication interface between the LEU and the train control center. Each LEU has two RS-422 interfaces to communicate with the train control cen...

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Abstract

The invention discloses a closed loop test method and a system of a ground-electronic-unit lineside electronic unit (LEU). A real LEU and analog devices are combined into the close loop test system to test functions of the LEU. The test method includes the following steps: firstly, original messages (variable) are transmitted to the LEU through an S port by using an analog device (a train control center), and the LEU conducts data programming language (DBPL) encoding to the messages after receiving the messages, secondly, the messages are transmitted to the analog device (an active transponder) through a C port, at last the analog device (the active transponder) decodes received DBPL codes and compares the DBPL codes with the original messages. Therefore, the purpose that closed-loop test functions of the LEU is achieved, and thus a function test of transparent message transmission of the LEU is realized, and normal working condition of the LEU is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of ground electronic unit LEU testing, and more specifically relates to a closed-loop testing method and system for ground electronic unit LEU. Background technique [0002] With the continuous improvement of train running speed, only relying on the track circuit to send blockage information to the on-board equipment can no longer meet the requirements of safe high-speed running of the train in terms of information volume. It is necessary to increase the transponder equipment to provide a large amount of Fixed and variable information. LEU (Lineside Electronic Unit, Ground Electronic Unit) is a safety-related device for data acquisition and processing units, which provides an interface between the signal system and the transponder, that is, provides an interface between the train control center and the transponder (including C interface and S interface), its main function is: receive the message sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/391
Inventor 江渝徐敏崔瑞通孙亮王欢
Owner BEIJING RAILWAY SIGNAL
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