Novel railway crossing prewarning equipment

Abstract

The invention discloses novel railway crossing prewarning equipment. Through serial connection of a radio frequency signal monitoring unit 21 at a radio frequency interface 15 between a wireless receiving / transmitting unit 6 and an antenna 7, in an energy coupling way, some of radio frequency signals transmitted by the receiving / transmitting unit 6 and radio frequency signals reflected by the antenna 7 are acquired; in addition, through signal processing and analysis, whole process detection of the signal quality and the signal functions of wireless crossing prewarning signals transmitted by the novel crossing prewarning equipment is achieved, and the functions of detecting and monitoring key performance parameter indexes such as the transmitting power of the novel crossing prewarning equipment and the standing wave ratio of the antenna 7 are achieved. The design defects that the conventional railway crossing prewarning equipment cannot detect and judge the quality and the functions ofthe wireless prewarning signals transmitted by itself are overcome, and the safety and the reliability of the equipment are improved.

Description

technical field [0001] The invention relates to the field of railway crossing safety protection, and relates to a novel railway crossing early warning device. Background technique [0002] Railway crossing warning equipment is a device used to monitor the safety protection of railway crossings, and is installed in the railway crossing room. In the event of emergency situations such as passing vehicles staying at the crossing and unable to pass, the wireless early warning signal can be transmitted through the crossing early warning equipment, and the locomotive driver can be notified in time to take emergency brakes, stop the train, and prevent major accidents caused by car crashes and fatalities. [0003] In 2003, the former Transportation Bureau of the Ministry of Railways issued the "Main Technical Specifications for 800MHz Train Tail and Train Safety Early Warning System (Provisional)" (Yunji Communication [2003] No. 349), which standardized the main functions and system ...

AI Technical Summary

Problems solved by technology

[0005] When the self-inspection button on the main unit of the traditional crossing warning equipment is pressed to start the self-inspection function, it can only detect whether the working status and logical control functions of the control circuits such as the main control unit 2, display unit 3 and speaker 3 of the equipment are normal, and cannot detect and judge Whether the signal quality and function of the wireless early warning signal transmitted by the wireless receiving / transmitting unit 6 are good or not, there are design defects

During routine maintenance, it was found that when the crossing warning equipment passed the self-inspection, the wireless warning signal of the crossing could not be successfully transmitted when the alarm button was pressed.

[0006] At the same time, if the standing wave ratio of the antenna 7 is too large, it will reduce the power of the wireless warning signal transmitted by the crossing warning equipment through the antenna, causing the warning range of the crossing warning equipment to shrink or even fail; in severe cases, if the standing wave ratio is too large , will burn out the wireless receiving / transmitting unit 6. Cause the early warning function of the crossing early warning equipment to fail

At present, the self-inspection function of the traditional railway crossing warning equipment does not have the detection and monitoring function of the standing wave ratio of the antenna 7

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