GPS Vehicle Tracker System can be used for Accident Detection Alert System
Nowadays, known stars and constellations have been replaced by the satellites of Global Navigation Satellite Systems (GNSSs). For positioning, it is sufficient to receive the radio signals of at least four satellites whose positions are known. The first GNSS and the predecessor of the well-known GPS was originally called the Navy Navigation Satellite System (NNSS), later called Transit. Starting in 1958, Transit was developed by the US Navy to provide accurate location information to ballistic missiles and submarines. From 1967 it was also used for civil applications. Its accuracy was between 500 and 15 m. Transit was shut down in 1996. GLONASS is a satellite navigation system developed by the Russian Space Forces. It was deployed during the Cold War as a competitor to the GPS, starting in 1976. The Chinese Beidou navigation system is a project for the development of an independent satellite navigation system. It is named after the Big Dipper constellation, which is called Beidou in Chinese. It is an experimental system of only four satellites, but the final GNSS with global coverage will include 35 satellites and be called Compass.
One simple network-based GPS-free positioning method is based on the cell coverage, by means of evaluating the cell identification. This scheme is commonly deployed by mobile network operators. The position of a mobile connected to a particular BTS, which is identified by its cell ID, is determined by the location of the base station itself. A more advanced network-based GPS-free positioning method using the cell coverage determines the location of a mobile connected to a multiantenna BTS by evaluating the center of gravity of the sector that the mobile belongs to, thus using that location as the estimated position of the mobile. Several cellular positioning techniques have already been commercially deployed for emergency call location and for mobile tracking services from mobile network operators, which allow a mobile to be localized using a Web interface, for instance. The Google Maps Mobile Application also provides tracking devices for people for navigation purposes.
In this project we are going one step ahead with GPS and going to track a vehicle using GPS and GSM. This GPS Vehicle Tracker System can also be used for Accident Detection Alert System, Mining people Tracking System and many more, by just making few changes in hardware and software.
GPS Module and Its Working: GPS stands for Global Positioning System and used to detect the Latitude and Longitude of any location on the Earth, with exact UTC time (Universal Time Coordinated). GPS module is the main component in our vehicle tracking system project. This device receives the coordinates from the satellite for each and every second, with time and date. GPS module sends the data related to tracking position in real time, and it sends so many data in NMEA format . NMEA format consist several sentences, in which we only need one sentence. This sentence starts from GPGGA and contains the coordinates, time and other useful information. This GPGGA is referred to Global Positioning System Fix Data. Know more about Reading GPS data and its strings here. We can extract coordinate from GPGGA string by counting the commas in the string. Suppose you find $GPGGA string and stores it in an array, then Latitude can be found after two commas and Longitude can be found after four commas. Now these latitude and longitude can be put in other arrays.
Tracking of vehicle is a process in which we track the vehicle location in form of Latitude and Longitude (GPS coordinates). GPS Coordinates are the value of a location. This system is very efficient for outdoor application purpose.This kind of Vehicle Tracking System Project is widely in GPS Vehicle Tracking Device Cabs/Taxis, stolen vehicles, school/colleges buses etc.
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