It has been over two decades since the GPS or the Global Positioning System has been functioning properly. GPS comprise of 27 satellites which are placed in the medium earth orbit. When a satellite is 35,000 kilometers or about 22,000 miles above the surface of the Earth, it is believed to be in medium earth orbit. The earliest experimental satellite was launched in the year 1972. It was 23 years after the launch in 1995 that this first GPS experimental satellite, bore fruit and worked as a fully functional satellite tracking system. At that time the GPS system was limited for the use of the military and the airline industry.
When GPS started functioning properly for both civilian and military needs people soon realized its implications. It was in 1996, that Bill Clinton, the President then released GPS for different uses. This resulted in including in improving civilian signals and there is much improvement in the accuracy and quality of the data. GPS system used for civilian purpose has become a commercial product and a useful service. There has been an incredible rise in the demand for GPS as a market technology since 2004 and there seems to be no stopping in the probable growth of this technology.
Know the working of the GPS Technology
These 27 satellites which are together known as the Global Positioning System consist of flight patterns which make 4 satellites accessible to a GPS receiver at all the time anywhere all through the world. A GPS receiver needs to get in touch and communicate with at least 4 satellites so that it can calculate the qualified location data minimally. The chances of calculating the location improves when larger number of satellites can get in contact with the GPS receiver.
To be able to triangulate any geographic position, the GPS receiver needs to calculate the time which is taken by the GPS satellite signal to reach the GPS receiver. With the help of this data the GPS unit calculates the distance of the object to each satellite. The information on time and distance is then utilized by the mapping software fed into the GPS receiver unit to establish an accurate position on earth.
The main uses of GPS technology has not really changed a lot in the past 30 years and its main purpose still is to pinpoint a spot anywhere on Earth as accurately as possible. Even the ways of using GPS technology has not really changed and its two main uses are navigation and tracking.