Vehicle collision prevention early-warning radar system for rail transit

Abstract

The invention discloses a vehicle collision prevention early-warning radar system for rail transit, and the system comprises a first radar main unit which is used for active range finding and inquiry; a second radar main unit which is connected with the first radar main unit and is used for range finding response. When the first radar main unit has a fault, the second radar main unit takes charge of the active range finding and inquiry functions of the first radar main unit. When the second radar main unit has a fault, the first radar main unit takes charge of the range finding response function of the second radar main unit. The system has a working mode of double-unit mutual monitoring redundancy, and improves the safety and efficiency of rail transit.

Description

technical field [0001] The invention relates to rail transit vehicle operation safety assurance technology, in particular to a collision avoidance and early warning radar system for rail transit vehicles. Background technique [0002] At present, the driving safety of high, large and medium traffic systems in rail transit mainly depends on the automatic train protection system (ATP) in the automatic train control system (ATC), while the sub-medium and low traffic systems all rely on the driver to drive. . For example, subways and light rail rely on the ATP system, and modern trams rely on drivers to drive. When the ATP system fails or degrades, the vehicle is in an abnormal working state, and its driving safety depends on the telephone blocking measures. In this state, the driver drives manually according to the command of the dispatcher. At this time, if there are special road sections such as curves and uphill and downhill, the driver's vision is limited, and there is a...

AI Technical Summary

Problems solved by technology

However, the sound wave detection method has sound pollution and the transmission speed is limited; the performance of laser, infrared, and video is affected in rainy and foggy weather; GPS cannot directly establish stable communication with satellites in the tunnel environment; The corresponding characteristics of the vehicle's traveling sound are stored, and the detection conclusion can be drawn by comparing with the pre-stored characteristics, and the reliability of long-distance detection is poor; the method of joint positioning of RFID tags and inertial navigation requires that RFID tags be arranged at intervals on the track, and satellite positioning is used in advance Determining the precise location information of each trackside RFID tag with precise maps requires a large workload. To achieve high ranging accuracy, a large number of tags need to be arranged; the train early warning method based on tunnel piston wind is only suitable for tunnel environments; radar The detection system has the ability to work around the clock and around the clock, making it an ideal choice

[0004] The patent (CN 103235310 B) authorized in November 2014 "A vehicle-mounted millimeter-wave train collision avoidance radar system" uses phased array radar technology to detect obstacles in front of the train, but the attenuation of high-frequency electromagnetic waves is relatively low in tunnel environments. Large, limited detection distance, and high false alarm rate in complex trackside environment, not suitable for urban rail transit environment

[0005] In the patent (CN 103171596 A) published in June 2013 "a collision avoidance warning method for rail transit trains", different frequency bands are used for distance measurement for uplink and downlink, and only different uplink and downlink trains can be distinguished. restricted

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