GPS - Global Positioning System is a satellite navigation system. Initially conceived as a navigation aid by the military is now the number of GPS satellites broadcasts precise timing signals by radio to GPS receivers.GPS provides a set of coordinates that the position of the GPS unit in terms of their length, width and height thus represent the planet Earth so that they accurately pinpoint their location anywhere on Earth at any time. It has to be an important tool for the mapand land surveying and is also very precise time reference for scientific research, as the investigation is required by earthquakes. GPS receivers are available in various formats, from devices installed in cars to phones to watches.
The GPS satellites broadcast precise clock information in two forms:
Coarse Acquisition code / C / A-This is mainly for civilian navigation that aired at 1023 MHz using repeated every millisecond. Each satellite sends a strong C / A code, whichthey can be identified.
Precise code / P-code P-code broadcast at 10.23 MHz, but it only repeats once a week. The P code is first in the Y-code or P (Y), which can only be decrypted by units with a valid decryption key is encrypted.
Applications of GPS:
There are a number of areas where GPS has been used as:
Military
It plays an important role in military support to be found, through the targeted access to military weapons such as missiles and precisionAmmunition. It also offers a good location awareness, and thus helps in the control of armed forces and lead command.GPS satellite nuclear detonation detectors.
Navigation
If you are someone who is always going probably lost during the trip then GPS is what you need in your car. It is to be used as an aid to navigation in cars, ships and aircraft. Hikers and climbers are using handheld GPS receivers to find their way. Even visually impaired people use these GPS devices to guide theirWay.
Surveying
Construction workers and GPS receiver for mapping the country's boundaries, structure search, and survey markers, and for the construction of roads.
Geocaching
GPS receivers are also recreational activities such as geocaching, which uses a handheld GPS receiver. Geocachers use this to travel to specific latitude and longitude of walking or hiking to natural locations, hidden away in the search for specific objects by other geocachers.
AircraftPassengers
Passengers can GPS devices in some airlines in the airplane during takeoff and landing, as it is very little risk of interference. These airlines integrate aircraft tracking into the seat-back television entertainment system, available to all passengers even during takeoff and landing.
Precise time reference
Used for the GPS is accurate time. Over time code generators, GPS is used as the reference clock and even if the sensors are usedthey are used to provide the exact time for each recording devices. Even atomic clocks of the GPS time is set time.GPS counted in days, hours, minutes and seconds, in a way that for most conventional standards is time.
Location-based Services
To find location-based services for all GPS-enabled handsets. It provides a location solution is more dependent on mobile phones and less on the telecommunication network topology. This also helps to provide specific locationInformation on the mobile phone.
The biggest problem with GPS is facing that the atmospheric conditions that can change speed of the GPS signals through the ionosphere. This effect is minimized when the satellite is directly above and more towards the horizon.
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