HOW DOES A GLOBAL POSITIONING SYSTEM WORK (GPS) WORK?
The basic principle of a GPS operation is that any point on Earth can be located if it is monitored from four different locations. For this, the GPS system uses 24 satellites in six different orbits at an altitude of 18,000 kms. So, at any time, any location is monitored by four different satellites. The GPS device sends its signal to the four satellites. These satellites have a database that contains information of all the locations on earth. These four satellites, in turn, send back the latitude, longitude and altitude of that particular location by referring to its database. WHAT IS FM? FM stands for frequency modulation. Attaching it to a carrier wave in radio frequency transmits the sound signal. The frequency of the radio wave is varied or modulated suitably. When the modulated wave is received by a radio set, the radio wave is filtered to reproduce the audio signal. FM are less susceptible to noise compared to AM or amplitude modulation where the mixing is done by varying the am
