GPS technology

January 30 [Mon], 2012, 17:50
Principle of operation

The vehicle (moving object) is installed satellite monitoring device. This can be a stationary unit, powered by the onboard network, as well as personal device (tracker) with battery-powered, pocket-size. With the help of equipment is determined by the location, speed, direction of movement of the car with the help of global positioning satellite system GPS / GLONASS, as well as examines the state of cell phone spy software various sensors (possibly the taking of testimony of any parameter, fuel consumption, fuel level, engine speed, etc.)

This data is then transmitted via the GSM network to a data server, which accepts, validates and stores the incoming information. When transferring data using technology GPRS (if necessary data is transferred via SMS). Built-in rechargeable battery will operate the device at a time of power failure.

To monitor the objects fit any computer connected to the Internet. This can be a desktop computer or laptop, notebook or PDA. The user, after logging on the data server has the ability to connect to a monitoring system with allowed him access rights. The user can observe the current location of objects with the projection on the maps, as well as to quickly get information on all movements of the object above, perform tasks on remote objects, such as monitoring temperature, engine status, fuel tank level, controlling truck's door and t . etc.

Description of GPS technology

NAVSTAR GPS - satellite navigation system, often referred to as GPS. Allows you to any location (including the polar regions), in almost any weather conditions to determine the location and velocity of objects. The system is designed, implemented and operated by the U.S. Department of Defense.

The basic principle of the system - positioning by measuring the distance to the object of points with known coordinates - satellites. The distance is calculated by the propagation delay time from sending his companion to the receiving antenna GPS-receiver. That is, to determine the three-dimensional coordinates of the GPS-receiver must know the distance to three satellites and the GPS time system. Thus, to determine the coordinates and height of the receiver, signals are used at least four satellites.

Accuracy. Typical accuracy of modern GPS receivers in the horizontal plane is approximately 1-2 meters in good visibility of satellites. For comparison, the accuracy of GLONASS is ± 10 meters.

Weaknesses. A common drawback of any radionavigation system is that under certain conditions, signal could not reach the receiver, or come with significant distortions or delays. For example, almost impossible to determine their exact location in the interior of an apartment inside the reinforced concrete building in the basement or in a tunnel. Since the operating frequency GPS is a UHF radio wave reception level signal from the satellites can seriously deteriorate under dense foliage or because of very high clouds. Normal reception of GPS signals may damage the interference of many terrestrial radio, as well as magnetic storms.

Description of technology GLONASS

Global Navigation Satellite System (GLONASS) -satellite navigation system, developed for the Ministry of Defence. The system will be 24 satellites moving over the surface of the Earth in three orbital planes with an inclination cell phone spyware of the orbital planes of 64,8 º and height of 19 100 km. The measuring principle is similar to American navigation system NAVSTAR GPS.

Currently the accuracy of positioning system GLONASS lags somewhat behind the similar parameters for GPS.
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