GPS - Global Positioning System is a satellite navigation system. Initially designed as an aid to navigation by the military number of emission rights, signals from GPS satellites calendar day by radio to GPS receivers.GPS provides a set of coordinates representing the location of GPS device in comparison to its length, width and height on earth, and that their position can be found everywhere on Earth at any time. It has become an important tool for mappingand topography, and is also a reference very specific period of time necessary for scientific research are used as the study of earthquakes. GPS receivers are available in various formats, from embedded devices in cars, phones with watches.
GPS satellites to provide accurate clock in two forms:
Coarse Acquisition Code C / AE "primarily for civil aviation, which are broadcast to 1023 MHz, repeating every millisecond. Each satellite sends a strong C / A code, which allows thembe identified.
The code / code-PP-Code Is distribution of 10.23 MHz, but it repeats only once a week. P-code is first encrypted Y-code or P (Y), which can only be decrypted by units with a valid key for decryption.
Applications of GPS:
There are many areas where GPS has been used as:
Military
It plays an important role in supporting the Army, the exact target of military weapons such as missiles and precision guided foundAmmunition. It also offers a good knowledge of the site and assist in the control of the armed forces and lead command.GPS satellite nuclear detonation detectors.
Navigation
If you are someone who can still get lost while driving then GPS is what you need in your car. It is used as an aid to navigation in cars, ships and aircraft. And hikers use handheld GPS receiver to find their way. Even people with visual impairments to use the GPS device to their leadersWay.
Surveying
Construction workers and GPS receiver for surveying the land to the boundaries, structures and markers of the survey found, and the construction of roads.
Geocaching
GPS receivers are also recreational activities such as geocaching, which uses a handheld GPS receiver. Geocachers use it to length and width of the specific walking or hiking in natural sites, travel, hidden in the search for specific objects by other geocachers.
AircraftPassengers
Passengers can GPS devices in some airlines in the airplane to use, with the exception of the landing and takeoff, as they have little risk of interference. These include the airline had been in the entertainment system on board followed by the television, by all passengers even during takeoff and landing.
Specifies the reference time
To be precise GPS time is used. Over time, the GPS code generators will be used as a reference clock and even if the sensors are used,used to provide the exact time for each recording device. Even atomic clocks are set time.GPS GPS time is counted in days, hours, minutes and seconds, in a way that is more time to the conventional standards.
Location-based Services
To find location-based services for all GPS-enabled handsets. It provides a location solution depends more on cell phones and less on the topology of the telecommunications network. It also helps to provide location-specific informationmobile.
The main problem in GPS is that the weather can change the speed of GPS signals through the ionosphere. This effect is minimized when the satellite is directly above and near horizon.
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