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Secondary ranging collision early warning method based on collision avoidance

A conflict avoidance and anti-collision technology, applied in the field of rail transit, can solve problems such as correctly judging the danger of train collision, and achieve the effects of preventing train rear-end collision, improving practicability, and improving ranging accuracy.

Active Publication Date: 2018-05-25
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

However, this method cannot correctly judge whether the train is in danger of colliding at the turnback line so as to give an early warning

Method used

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  • Secondary ranging collision early warning method based on collision avoidance
  • Secondary ranging collision early warning method based on collision avoidance
  • Secondary ranging collision early warning method based on collision avoidance

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 Shown is a schematic flow chart of the present invention.

[0034] Step 1: The train obtains the uplink and downlink information of the track by reading the RFID tag information on the main line;

[0035] Step 2: The system uses the carrier sense multi-access method to provide all early warning systems with a fair opportunity to obtain media access. Before sending data, monitor the 2.4GHz channel status to confirm whether the media is busy. If the channel is busy, the system waits for a period of time to resend the information;

[0036] Step 3: If the channel is idle, the system waits for a period of time (backoff time), then re-acquires the media, and uses random backoff time to avoid signal conflicts as much as possible;

[0037] Step 4: The successful acquisition of the signal is determined according to the sending...

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Abstract

The invention relates to a secondary ranging collision early warning method based on collision avoidance. The secondary ranging collision early warning method based on the collision avoidance comprises the steps that a passive end begins to answer after receiving a data packet transmitted by an active end, sends an acknowledgement packet and calculates a time delay T2 from receiving the data packet to sending the acknowledgement packet; the active end receives the answering of the passive end and obtains a time delay T1 from sending the ranging data packet to receiving the acknowledgement packet; the passive end sends a ranging data packet containing the T2; the active end receives the ranging data packet containing the T2, which is sent by the passive end, and sends an acknowledgement packet; the active end calculates a time delay T3 from receiving the ranging data packet to sending the acknowledgement packet; the passive end receives the new acknowledgement packet and calculates a time delay T4 from sending the ranging data packet containing the T2 to receiving the new acknowledgement packet; and the passive end sends the ranging data packet containing the T4 to the active end and obtains distance information through calculation. The secondary ranging collision early warning method based on the collision avoidance has the advantages that the range detection of urban rail traffic collision early warning can be effectively realized and the practicability of train collision early warning equipment under complicated environments can be improved.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a collision avoidance-based secondary distance measurement anti-collision early warning method, which is especially suitable for distance detection of subway trains under complex backgrounds. Background technique [0002] Because the train is in the actual running process, sometimes it is necessary to cut off the automatic train protection system. At this time, the operational safety of the train is greatly reduced, and it is difficult to fully ensure the operational safety of the train only by means of traditional telephones. The train anti-collision auxiliary warning system based on wireless ranging technology does not need to set up a ground base station for wireless communication, which can greatly save construction costs; in addition, the system does not need to use GPS, Beidou and other satellite positioning signals, and can be used in subways without obstacles. It ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61L23/34
CPCB61L23/34
Inventor 杜劲松高洁赵越南高扬王伟仝盼盼丛日刚李想张清石田星白珈俊
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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