NAVSTAR GPS is a very famous navigation system that is applied by a great number of people nowadays. This system is created for ascertaining the position and speed of the objects at any place on Earth. It can be done almost in any weather conditions and in all the territories on Earth including polar territory and in outer space to 100 kilometers above Earth. The developer of GPS became the United States Department of Defense that has accomplished this system.
The principle of the position detecting is in measuring the distance from the point with the definite coordinates to an object. The sending satellite spreads radio signal to a GPS antenna and the delay time is calculated to define the distance between the receiver and transmitter. 3-D coordinates may be defined when GPS receiver will know the distance to 3 satellites and the time of the NAVSTAR GPS system. And when we need to define coordinates and altitude of a receiver we are to apply minimum 4 signals from 4 transmitters. Orbital force supervision is realized from the main control station that is located in Schriever base, Colorado.
A great amount of usual people as well as the police, sailors and rescuers apply Global Positioning System for different needs, mostly for navigation, position and velocity detection. GPS systems are being sold in different shops and they are built in cell-phones, personal computers and onboarders. GPS receiver allows a consumer to detect geographical coordinates of the receiver's situation at the present moment of time. The exactness of the detection of the signal position is from 3 to 5 meters and it is really heightened with the correction radio signal from Earth and the calculating error is one millimeter.
GPS devices GPS mapping software GPS software GPS systems portable GPS