15-02-2013, 10:23 AM
GPS in India
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What is GPS?
Global Positioning System (GPS) refers to a structured satellite constellation network comprising of around 24 satellites orbiting the earth’s atmosphere used for navigational, surveying, mapping, routing, charting and time distribution purposes.
How does GPS work?
The basis of GPS is triangulation from satellites.
To triangulate, a GPS receiver measures distance using the travel time of radio signals.
To measure travel time, GPS needs very accurate timing which it achieves with some tricks.
Along with distance, we need to know exactly where the satellites are in space.
Finally we must correct for any delays the signal experiences as it travels through the atmosphere.
GPS in India
India has been using GPS technology since the early 90’s. India uses a wide array of GPS based services to monitor, manage, control and administer different aspects like weather, irrigation, traffic etc.
GPS is mainly used in India to identify weather conditions, track vehicular traffic, track irrigation aspects, identify national borders, identify vegetation areas and habitats etc. The services rendered by Global Positioning System (GPS) in India are plenty.
These are the areas in which the GPS is mainly used in India:
Road Information System
Disaster management
Forestry, Environment & Resource Management & Agriculture
Aerospace and in Defense Applications.
Transport Sector, Power Generation & Distribution
Logistics and Asset Management
IRNSS
The Indian Regional Navigational Satellite System (IRNSS) is an autonomous regional satellite navigation system developed by the Indian Space Research Organisation (ISRO) is under total control of Indian government
This System provides an absolute position accuracy of better than 20 meters throughout India and within a region extending approximately 2,000 km around it.
SIMRAN
SIMRAN stands for Satellite Imaging For Rail Navigation . It is Real Time Passenger Information System .
SIMRAN involves a simple implementation of the Global Positioning System (GPS), GSM and radio frequency-based instrumentation.
It is a train-tracking system which enables monitoring every train in a certain geographical boundary for its location, speed, and the direction of movement.
GAGAN
GAGAN is the name of Indian version of US's WAAS (Wide-Area Augmentation system). GAGAN stands for GPS Aided Geo Augmented Navigation. GAGAN is a planned implementation of a regional Satellite-Based Augmentation System (SBAS) by the Indian government.