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Nirdeshak
is a GPS-based automatic fleet management
system used for monitoring and controlling
vehicles from a central station. The system
gathers positioning information without
any driver intervention. The information
is sent automatically over a communication
network to a central station.
Nirdeshak
uses the differential global positioning
system (GPS) satellites of the US for
positioning information. GPS is a constellation
of 24 satellites orbiting the earth at
an altitude of 20,200 km. The satellite
orbits ensure that four to six satellites
always remain in line-of-sight, and can
send navigational messages at all times
to any point on earth.
Based
on these navigation messages, GPS receivers
mounted on vehicles can compute their
position by the triangulation method,
in three dimensions (latitude, longitude
and altitude). The accuracy using a standalone
GPS receiver is usually around 100 metres.
Accuracy shoots up when a differential
GPS receiver (DGPS) is used, as it eliminates
major sources of error by applying differential
corrections transmitted from a reference
DGPS receiver.
The
reference DGPS receiver is located at
a known, surveyed location. It computes
its own position from GPS satellites,
compares the computed position with its
known position, and transmits the corrections
to mobile DGPS receivers over a radio
network. The mobile receivers apply these
corrections, and position data that is
accurate up to 2-5 metres can be obtained.
System
configuration
|
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Central
control station: Computer running
application software |
|
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Network
controller |
|
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Nirdeshak:
Mobile packet radio modem integrated
with DGPS mounted in vehicles |
|
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Communication
media |
Applications
|
|
Mining
sector |
|
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Public
safety services |
|
|
Transport
sector |
|
|
Personal
use |
|
|
Defence |
Technical
architecture, hardware and software platforms
Central
control station
| Hardware |
Pentium
III / IV PC with two serial ports |
| Operating
system |
Windows
95 / NT |
Network
controller
| Hardware |
16-bit
integrated multi-protocol controller
at 16MHz, 256KB EProm, 64KB RAM, 256KB
Flash, three RS-232 serial communication
ports |
Nirdeshak
| Hardware |
16-bit
integrated multi-protocol controller
at 16MHz, 256KB EProm, 64KB RAM, 256KB
Flash, three RS-232 ports and one
RS485 serial communication port, 8-channel
GPS receiver, 128 X 64 graphical LCD |
Strengths
|
|
Identifying
and displaying the position or the
location of the vehicle in real-time. |
|
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Ease
of decision-making |
|
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Low
operating cost |
Experience
CMC has a dedicated communications group
continuously working on support activities
and enhancement of this product.
Indicative
client list
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Andhra
Pradesh Road Transport Corporation |
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Delhi
Transport Corporation |
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Northern
Coalfields Ltd |
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Meghalaya
Police |
Contact
Head
- Transportation
CMC Limited
C-18, Bandra Kurla Complex,
Bandra (East)
Mumbai 400051 India
Tel: 91-22-26591000/01/02
Fax: 91-22-26591046
Email:
transportation@cmcltd.com
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