How GPS works:
As described above U.S. Department of Defense (USDOD) made it for military use and put the satellites into orbit. The satellite moves in a precise orbit, and circle around the orbit of earth twice a day. Each satellite transmits orbital parameters and a unique signal that helps and allows GPS devices to compute and decode its precise location. This information is important for GPS receiver and trilateration to calculate the exact location of a user.
GPS receiver measures the distance to each satellite by calculating the time duration which it takes to receive a transmitted signal. Similarly, from a few more satellites, the GPS receiver can find or determine the position of a user and displays his location electronically. This helps to measure user’s running route or to find a way to his destination.
To calculate user’s latitude and longitude (2-D position) and to track his movement, a receiver must be locked on to the signal of minimum three satellites. If receiver locked onto the signal of 4 or more satellites, then it can calculate user’s 3-D position i.e. latitude, longitude and altitude. A GPS receiver generally tracks 8 or more satellites, but it depends on the location of a user on earth and the time of day.
Use of GPS in Cell Phones:
At present GPS used in different kind of systems, however, its implementation in Cell phones made it more valuable. New generation cell phones are full of many modules and one of those is GPS.
Today a cell phone user can navigate any path or way with the help of GPS. Cell phones with GPS receivers try to communicate with 30 global positioning satellites in the GPS system to provide the accurate location. GPS made the user’s travelling experience better, easier and safer.
If a user is visiting a place of which he is not familiar with, then he may get lost on the way.
. Also in a case of an emergency, he can send his geocodes or latitude-longitude to his knowns and to emergency services.
Some cell phones do not have GPS in it, but they have a feature of AGPS (Assisted GPS). AGPS uses cell tower’s position and distance to calculate user’s location. Cell phone with AGPS communicates with towers connected to a base station in configuration which is known as ‘Cell’. If user moves through the cell, then base station monitors his cell phone signal and transfers it to the nearest tower.
So, if you are lost somewhere or if you are trying to find the location of an area or if you are finding hard to reach a place, then just take out your smartphone and enable its GPS. Now an app like Google Map will help you in finding your way.