Traffic Supervision Centre
The purpose of the main functions of the system:
- provision of continuous supervision of transit including collection of information about its correctness,
- effective location of vehicles in operation,
- informing passengers at the stations about actual departure times of the vehicles.
The most important advantages of the system:
- more effective management of the means of public transport in typical situations (as well as in extraordinary ones);
- improvement of the company image by better adherence of vehicles to timetables;
- improvement of the image of the organiser by the fact that he owns modern system for supervision of transit;
- more effective use of the rolling stock facilitated by access to current information about the transit;
- improvement in the safety of the driver and the passengers resulting from ability to monitor emergencies signalled on-line by the driver;
- decreasing costs of operation of vehicles due to the ability to monitor technical parameters and verification of overloading or improper operation of a vehicle;
- continuous tracing of movement of vehicles (even outside the scheduled routes - i.e. special vehicles) and its indication in adequate reports.
Basic elements of the system
- Transit supervision centre (CNR),
- Train Stop Information Board (TIP),
- leased operator network (operator's APN or a dedicated APN server) for package data transmission
How does the control system work
The rolling stock vehicles are equipped with devices registering their location (and other related parameters) using the satellite navigation system - GPS. Equipment of vehicles includes control panel acting as on-board computer of the system. The computer, realizing the route selected by the driver, verifies current transit coordinates (time and location) with the input parameters. On their basis it informs the driver about realization of the task and additionally records the actually realized one. The data and other measured values are transmitted by the GSM/GPRS modem to the server in the office of the organizer of the transit.
The Centre (organizer of transit) collects the data transmitted from vehicles. The use of GSM/GPRS technology allows to collect the data from vehicles with determined, high frequency and with considerably low costs. The centre also prepares and publishes Timetables. Long distance GPRS connection can also change the schedule of routes (referred to as timetable - RJ) recorded in the memory of the on-board computer. It allows to introduce changes to the schedule beforehand, coordinating current requirements and offering the possibility of their subsequent and correct realization by vehicles of the transport company.
Transmission of part of the monitored data to the office of transport operator (transport company) allows dispatcher of the company to control selected parameters of the vehicle and transit task performed. Moreover, using own analogue network of dispatcher communication and on the basis of owned radio-telephones it is possible for the dispatcher to influence condition of monitored objects by using adequate commands on phonic channel.
Information registered and transmitted on-line from vehicles makes it possible to equip the transit system with additional applications. One of them is the system for informing passengers at the stations. Indicator boards equipped with GPRS, located in important points in the communication network allow CNR system server to transmit to a given board the data about the actual arrival time of a vehicle of a determined line with respect to the time table departure time. This considerably improves the comfort of passengers using public transport services.