Global Navigation Satellite Systems Gnss

GPS, or Global Positioning System, is a satellite-based navigation system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth. It has a wide range of applications. **Statement 1 is correct.** GPS is used in mobile phones for various purposes such as location tracking, navigation, and location-based services. **Statement 2 is correct.** GPS is used in banking operations for ATM location services and for time-stamping transactions, which is crucial for maintaining accurate records. **Statement 3 is correct.** GPS is used for time-stamping power system measurements, which is vital for grid stability and synchronization. Therefore, GPS technology can be used in all the three areas mentioned.

* Satellite navigation is based on the use of range measurements between navigational satellites and the user. Information about the satellite's coordinates is given to the user through a navigation signal. Range measurements are based on the calculation of the receiving signal time delay compared with the signals generated by the user equipment. * Currently, there are four global systems viz., GPS from the USA, GLONASS from Russia, Galileo from the European Union, and BeiDou from China. In addition, there are two regional systems viz., NavIC from India and QZSS from Japan. * Global navigation system caters to the users in the entire world, whereas the regional navigation system caters to the users in the limited service area. **Hence, option (D) is the correct answer.**