06-02-2012, 03:08 PM
Global Positioning System
[attachment=17196]
Introduction
(GPS) technology is a great boon to anyone who has the need to navigate either great or small distances. The Global Positioning System (GPS) is a burgeoning technology, which provides unequalled accuracy and flexibility of positioning for navigation, surveying and GIS data capture. This wonderful navigation technology was actually first available for government use back in the late 1970s. The Global Positioning System (GPS) is a radio based navigation system that gives three dimensional coverage of the Earth, 24 hours a day in any weather conditions throughout the world. The technology seems to be beneficiary to the GPS user community in terms of obtaining accurate data upto about 100 meters for navigation, metre-level for mapping, and down to millimetre level for geodetic positioning. The GPS technology has tremendous amount of applications in Geographical Information System (GIS) data collection, surveying, and mapping.
GEOPOSITIONING -- BASIC CONCEPTS
By positioning we understand the determination of stationary or moving objects. These can be determined as follows:
1. In relation to a well-defined coordinate system, usually by three coordinate values and
2. In relation to other point, taking one point as the origin of a local coordinate system.
GPS - COMPONENTS AND BASIC FACTS
The GPS uses satellites and computers to compute positions anywhere on earth. The GPS is based on satellite ranging. That means the position on the earth is determined by measuring the distance from a group of satellites in space. The basic principles behind GPS are really simple, even though the system employs some of the most high-tech equipment ever developed. In order to understand GPS basics, the system can be categorized into
FIVE logical Steps
Triangulation from the satellite is the basis of the system.
To triangulate, the GPS measures the distance using the travel time of the radio message.
To measure travel time, the GPS need a very accurate clock.
Once the distance to a satellite is known, then we need to know where the satellite is in space.
As the GPS signal travels through the ionosphere and the earth's atmosphere, the signal is delayed.
[attachment=17196]
Introduction
(GPS) technology is a great boon to anyone who has the need to navigate either great or small distances. The Global Positioning System (GPS) is a burgeoning technology, which provides unequalled accuracy and flexibility of positioning for navigation, surveying and GIS data capture. This wonderful navigation technology was actually first available for government use back in the late 1970s. The Global Positioning System (GPS) is a radio based navigation system that gives three dimensional coverage of the Earth, 24 hours a day in any weather conditions throughout the world. The technology seems to be beneficiary to the GPS user community in terms of obtaining accurate data upto about 100 meters for navigation, metre-level for mapping, and down to millimetre level for geodetic positioning. The GPS technology has tremendous amount of applications in Geographical Information System (GIS) data collection, surveying, and mapping.
GEOPOSITIONING -- BASIC CONCEPTS
By positioning we understand the determination of stationary or moving objects. These can be determined as follows:
1. In relation to a well-defined coordinate system, usually by three coordinate values and
2. In relation to other point, taking one point as the origin of a local coordinate system.
GPS - COMPONENTS AND BASIC FACTS
The GPS uses satellites and computers to compute positions anywhere on earth. The GPS is based on satellite ranging. That means the position on the earth is determined by measuring the distance from a group of satellites in space. The basic principles behind GPS are really simple, even though the system employs some of the most high-tech equipment ever developed. In order to understand GPS basics, the system can be categorized into
FIVE logical Steps
Triangulation from the satellite is the basis of the system.
To triangulate, the GPS measures the distance using the travel time of the radio message.
To measure travel time, the GPS need a very accurate clock.
Once the distance to a satellite is known, then we need to know where the satellite is in space.
As the GPS signal travels through the ionosphere and the earth's atmosphere, the signal is delayed.
