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1. System significance
1) Assist subway dispatch to ensure the safety of passengers and rail transit
2) When the vehicle enters the station and enters the area, the vehicle identity is recognized and the time is recorded
3) When the vehicle completely enters the platform area, it realizes the stop status recognition
4) When the vehicle exits the platform and departs from the station, realize the vehicle identity recognition and record the time
5) Vehicles in two directions can avoid missing and misreading when recognizing
2. System architecture and program description
The metro vehicle counting system is based on the needs of Shanghai Renwei Electronic Technology Co., Ltd. for the daily safety management of rail transit, using semi-activeRFIDTechnology to record and identify the identity of the operating subway vehicle and the time and status of entering, stopping, and leaving the station. The system adopts the technology of combining active 2.4G and low frequency 125K, namely 2.4G receiving and identifying transmission, 125K triggering wake-up. 2.4G is mainly used for the identification of vehicles entering the station and long-distance wireless transmission, and 125K is mainly used for the accurate identification of garages, crossroads and parking lanes. The comprehensive data obtained by these two identification methods can be used as the basis for determining the specific location and direction of the vehicle.
Schematic diagram of island platform system
2.1 Program description
The dual-frequency positioning tag installed on the vehicle is awakened by the 125K low-frequency activator antenna when the vehicle enters the station entry area, and the tag starts to work. After collecting the ID and RSSI value of the representative vehicle identification tag, the 125K antenna address code, and the value of 2.4 G is sent out in a long-distance way, and is received and transmitted by a 2.4G omnidirectional reader to record the vehicle’s entry identity and entry time. When the vehicle leaves the platform and leaves the zone, the vehicle’s exit identity and exit time are recorded in the same way, and the stop status and stop time are judged by calculating the entry time and the exit time. Using dual-frequency semi-active technology, vehicles in two directions can avoid missed and misreading during identification. Realize the accurate judgment of the vehicle’s traveling direction, and achieve the effect of precise positioning of the vehicle.
3. Case introduction
Car counting system for a subway line in Shanghai
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