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A method of train approach warning and collision avoidance based on cstdma

A train approaching and collision avoidance technology, applied in the direction of railway signal and safety, to achieve the effect of ensuring business reliability, shortening the transmission interval, and improving the train approaching perception ability

Active Publication Date: 2021-09-24
天津七一二移动通信有限公司
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  • Abstract
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Problems solved by technology

This method is mainly designed for the launch mechanism of locomotive equipment

Method used

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  • A method of train approach warning and collision avoidance based on cstdma
  • A method of train approach warning and collision avoidance based on cstdma
  • A method of train approach warning and collision avoidance based on cstdma

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] Such as figure 1 As shown, the train approach warning and collision avoidance methods are realized through the train approach warning system. The train approach early warning system includes locomotive equipment and crossing early warning equipment wirelessly connected to the locomotive equipment, portable early warning devices, and pocket early warning devices; the working model of the train approach early warning system is mainly for locomotive equipment to send train approach early warning messages, and non-locomotive equipment to receive or respond. The difficulty of its design lies in the message collision caused by terrain, movement, air interface transmission mechanism and other reasons, which makes the collision avoidance mechanism invalid.

[0031] The present invention designs a new frame structure format, and divides the train approach warning message...

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Abstract

The invention discloses a method for realizing train approach early warning and collision avoidance based on CSTDMA. 1. The locomotive equipment monitors the transmission messages of the equipment in the system, and establishes a time slot occupancy mapping table; 2. Select the transmission period according to the train speed and location scene; 3. After the transmission time arrives, select the transmission time slot according to the occupancy rule; 4. If the occupancy is met 5. Update the time slot occupancy mapping table according to the received warning message; 6. Select the frame format and transmission period for transmission according to the train speed, and select the transmission time slot according to the frame format. This method defines two frame format structures, and adds a time slot structure with a listening window to the low priority frame design to introduce carrier sense time division multiple access, namely CSTDMA, to further reduce the collision probability. Guaranteeing the basic transmission cycle of locomotive equipment and providing safe transmission opportunities after the train speeds up can better solve the problem of message collision.

Description

technical field [0001] The invention relates to the field of railway private network communication, in particular to a method for realizing train approach early warning and collision avoidance based on CSTDMA. Background technique [0002] At present, the train approaching early warning system uses analog or digital methods to send messages, the information is 248 bits, and the POCSAG code is used for transmission. At present, locomotive equipment and train approaching warning messages need to transmit data such as preamble and synchronization code at the same time, and the time to transmit a frame of approaching warning information is 960ms. Therefore, it has the disadvantages of long cycle time and high collision probability. [0003] Some manufacturers now use DMR technology to communicate by sending approach warning messages through multiple CSBKs or MBCs. The advantage of the DMR system is that channel machines and terminals are widely used in railways, and customizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B61L23/00
CPCB61L23/00
Inventor 秦嗣波郑彩顺刘冰炎刘武超王远雷志芳
Owner 天津七一二移动通信有限公司
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