International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004
GPS receiver can convert satellite signals into position, velocity,
and time estimates. After the White House removed the
intentional degradation of GPS signals, civilian GPS receivers
are accurate to within less than 20m, ushering in an exciting
time for GPS applications like location-tracking systems.
2.5 GSM
GSM is a digital cellular communication system that prevails
throughout Europe and much of the rest of the world. At present,
cellular communication system has become a new trend for
many varieties applications, especially railway application
(called GSM-R). GSM system is divided into three parts:
mobile station, base station subsystem and network subsystem.
At present, the commercial GSM-R rail communication systems
can provide all the services required:
1. Train control systems, where data exchange between
trains and track-side traffic control centre is required
2. Voice communication between all users (train drivers,
traffic controller, track-side workers, train personnel)
3. Emergency call handing
4. Data messages exchange
5. Communication recording
6. Integration with other existing (or future) systems
3. QINGHAI-TIBET RAILWAY INFORMATION
MANAGEMENT PLANNING
Railway management information system is a complicated great
system. The QTIMP includes six systems (Lu et al.. 2003),
shown in figure 1, which are:
Decision support & composite
application system
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| Office information system
i 1 1
i 1 i
| 1 i
Operation management information system
| locomotive :
ii |
Communication 5 |
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network system
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E- business
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Process control & safety assurance system
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Figure 1. Qinghai-Tibet railway information management
planning architecture
3.1 Communication Network System (CNS)
It transmits data, voice, even image information among the
systems. It provides a platform for information exchange.
3.2 Operation Management Information System (OMIS)
It is designed for different level of managers from different
management sector as passenger/freight transport sector,
locomotive sector, etc. It can assist managers to rapidly acquire,
deliver, and use information, further, provide aided design.
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3.3 Process Control& Safety Assurance System (PCSAS)
It ensures on-line vehicles safe. It collects data, monitors the
work status of equipments, even timely alerts or alarms when
irregular cases arise. On the one hand, data about on-line
equipment are transferred to OMIS, on the other hand,
commands from OMIS are taken and the work status
equipments controlled are made to the high point.
3.4 Office Information System (OIS)
It is designed for the different level of administers. It supports
office tasks done by computer, accelerate information delivery,
thus makes office management more effective, In addition, OIS
is linked with OMIS, providing information communication
between both of them.
3.5 Decision Support &Composite Application System
(DSCAS)
It is an intelligent system based on the operation management
information system. It can provide top managers with intelligent
services and decision support. It consists of computer-aided
plan devising, decision support system, and expert system, etc.
3.6 E-business System (ES)
It can buy and sell goods and services on the internet,
facilitating inter and intra-organization flow of goods, services,
information, communication, and collaboration. It also provides
customer service as information consultation, seat reservation
and selling, etc, on the internet.
4. APPLICATION TO QTIMP OF THE G3
INTEGRATION
According to the design of the line, there are only 5 pairs of
passenger train, about 80 million tons freight in the upward
direction (from Lhasa to Xining), and 210 million tons freight
in the downward direction(from Xining to Lhasa). The Qinghai-
Tibet line is a low traffic rail line. There are long-block sections
(about 60km) and few stations along the Qinghai-Tibet line, so
the central traffic control is used (Tao, et al., 2003). For the low
traffic Qinghai-Tibet rail line under the particular conditions,
the advanced technologies should be used to simplify the
structure of the vehicle control system, to reduce especially
trackside equipment, thus to ensure train system high safety,
high reliability and less maintenance. G3 integration used by
the QTIMP can meet above demands:
l. A system for displaying the information
2. A system for locating the position of a vehicle
3. A system for transmitting the information to a control
centre.
4.1 Control Centre with GIS-based Terminals
The control centre system provides two-way messaging
between the on-board units and a central centre. On the one
hand, the control centre can not only receive data from the on-
board units, but also send a command to an on-board system, or
even reprogram it remotely. The frequency of status message
delivery, and other parameters controlling communication can
also be
changed remotely by the centre operator. On the other hand,
Irregular situation and emergency calls from the On-board units
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