GPS navigation system
A car navigation system is used to measure the self vehicle position and the traveling direction, and then to exactly and quickly display information to the driver on a display unit. Satellite positioning systems such as the global positioning system (GPS) use satellites in space to locate objects on earth. The global positioning system (GPS) is a satellite-based navigation system developed and operated by the U.S. Department of Defense. GPS permits land, sea, and airborne users to determine their three-dimensional positions, velocities, and time. The global positioning system has become increasingly popular as a position determination or time determination mechanism for a variety of applications. Using data received from GPS satellites, a receiving device can compute the position of the receiver and the current time. With GPS, signals from the satellites arrive at a GPS receiver and are used to determine the position of the GPS receiver. The navigation system which displays the current position by using the GPS system includes map data including digitized road information, and carries out a map matching, which estimate the accurate position by using the data. A GPS system receiver determines its terrestrial location by triangulating its position relative to GPS satellites in orbit around the earth, by receiving signals transmitted from the satellites, measuring the travel times of the signals from the satellites to the receiver, and then calculating the distances of the satellites from the receiver based on the travel time. The GPS receiver acquires and tracks signals consisting of carrier, pseudo random codes and modulated data from various satellites. The receiver correlates locally-generated codes with the codes received from the respective satellites to derive timing information relating the receiver time relative to the local generation of code chips to the satellite time at the times of the transmission of the corresponding code chips. Over the past decades, a variety of global positioning system (GPS) navigation receivers are now commercially available for a number of applications. GPS based navigation devices have been increasingly used for navigation of vehicles along airways, waterways and roadways. This is as a result of the relative compactness, light weight, reliability and accuracy of these devices compared to traditional navigational aids such as UHF and VHF receivers.
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