How does GPS - Navigation

One of the pressing problems of today's motorists - protecting their cars from theft. Currently, there are a variety of methods of protection, but none of them did not give an absolute guarantee of safety. When to monitor the transport, the most inexpensive cars are equipped with most of them anti-theft devices in the simplest, and in expensive cars are set serious security devices. These include GPS-navigators that allow you to locate the vehicle in any area. So what is a GPS-navigation? This system, which consists of satellites (NAVSTAR) and ground monitoring stations, which are united in a common network. And as her individual subscriber receivers, which take the satellite signals and calculate this information, its location to within 100 meters, and full coordinates of latitude, longitude, and altitude, as well as determination of time of up to 1 nanosecond. In the system itself consists of 24 NAVSTAR satellites that are located in six orbits at an angle of 60 degrees to each other. Each of them turns around the planet in 12 hours. In each set the atomic clock, computing encoder and transmitter, operating at 1575, 42 MHz. Satellites are changed every 10 years, and the cost of their construction about 12 billion dollars. Location of each surface object is determined by the delay time of receiving a message from time to time send a message board the satellite. Therefore, the clock on the receiver and the satellite sync. As already mentioned, that the error in determining the location of up to 100 meters, but this distance is generally reduced to 30 m, and in some cases only a few centimeters. Scope of GPS-navigation is very wide. Initially, this system was designed exclusively for military and space objects. Currently, there are GPS-receivers of various types, including automobiles. They are designed to be installed in any vehicles and transmit the motion parameters in the control towers. In addition to security functions, they help to identify and route of its formation and settlement, as well as peredayut e-mail.