Further, over the period of time, human beings have cast to the skies to maneuver their way since ancient times. Remarkably, the ancient sailors relied on the arrangement in the night sky to discover where in particular they were and heading to. Right now, all we require is a simple hand-held GPS (Global Positioning System) receiver to work out our way where precisely we are in the world. On that account, we would define the meaning of the GPS as a satellite-based system that provides us the capabilities to ascertain or determine positions anywhere on earth.
Under the watchdog of U.S, Department of Defense NAVISTAR, GPS gives continuous round the clock (24hours), three-dimensional positioning, real-time, navigation worldwide. Interestingly enough, GPS provides any person with the GPS receiver accessibility to the system, let alone compatible with any application that needs location coordinates. Before we look at how the GPS works, GPS constitutes three segments that facilitate its operations namely, space-segment, user segment and the control system (controlled by American military). If we indulge in the space segment mentioned above that is the satellite themselves, the GPS satellites receive their power primarily from sun-seeking solar panels with backup batteries giving the alternative power.
Through radio signals, the GPS satellites perpetually broadcast satellite position as well as timing data through two frequencies. These radio signals astonishingly move at speed of light taking relatively six over one-hundredth of a second to land on earth. Needless to say, without the direct line to the GPS receivers, the GPS satellite signals cannot reach earth.
The GPS receivers are endowed with the capabilities of calculating its position through a technique referred to as satellite ranging, which constitutes the calculation of the length between the GPS receiver and the GPS satellites it’s possibly tracking.
When it comes to calculating range, it is measured as expired transit time, meaning what the GPS receiver calculates is approximate of range other than an actual range. As a result, each GPS satellite is established followed by the transmission of their locations as part of the information sent through radio signals. Remarkably, based on the information generated from the GPS satellites, the GPS receiver cipher its position being the unknown point on the ground.
Notably, the GPS has the capability of measuring the distance to the satellites. In order to do that, it begins by calculating the length between the GPS receiver and satellites which need calculating the time required in order for the waves to move from the satellite to the receiver. What happens next is that immediately the receiver identifies the amount of time that has expired, it then spreads the distant-time of the wave times the speed of light to calculate the length. On account of that, the GPS receiver would be able to calculate the travel time of the satellite signal when it has identified at what time the signal left the satellite as well as when it landed on the receiver.
How would the one know how the signal has reached the receiver? As a matter of fact, the GPS receiver only has to check its interior clock the moment the signal gets in to check what time it is. Besides that, how would it know at what point the signal left the satellite? It is imperative to understand all GPS receivers assimilate with the satellites in order to create the exact electronic code simultaneously. The moment the receiver gets a code from a satellite, it provides itself with an opportunity to trace back in its memory store and recalls when it released a similar code. With that in mind, it enables the receiver to establish at what point the signal set off from the satellite.