GPS – Global Positioning System is a satellite navigation system. Initially conceived as an aid to navigation 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 position of the GPS unit in relation to their length, width and height on the planet Earth so that they then determine their position anywhere on Earth at any time. This is becoming an importantMeans of making the map, the Land Registry and is also very accurate time reference for scientific research, because the investigation was prompted by earthquakes. GPS receivers are available in various formats, from devices installed in cars to phones to watches.
The GPS satellites transmit accurate clock in two forms:
Code Acquisition big / C / A-This is mainly due to the civil aviation, which aired at 1023 MHz with repeats every millisecond. Each satellite transmits a clearC / A code, so that they can be identified.
Precise code / PP-code transmission of codes to 10.23 MHz, but it repeats only once a week. 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 find, through the targeted access to military weapons such as rocketsAnd precision munitions. It also offers a good location awareness, and therefore contributes to the control of armed forces and lead command.GPS satellite detectors to nuclear detonation.
Navigation
If you are someone who is always going to probably lost during the trip, then GPS is what you need in your car. E '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 blind people use these GPS devicesto guide their way.
Surveying
Construction workers and GPS receiver for mapping the boundaries of the country, the research facility, 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 go to latitude and longitude of walking or hiking in natural locations, hidden in search of some objects from othersGeocachers.
Passenger Aircraft
Passengers can GPS devices in some airlines plane during takeoff and landing, because the risk is very little interference. These airlines integrate aircraft tracking into the seat-back television entertainment system, available to all passengers even during takeoff and landing.
The reference point in time
GPS is used for the correct time. Over time code generators to use GPS as a reference clock and, if the sensorsthey will be used used to provide the exact time for each recording device. Even atomic clocks, GPS time is set time.GPS calculated in days, hours, minutes and seconds, in a way that for most of the conventional rules is time.
Location-based services
To find location-based services for all GPS-enabled laptops. Provides a solution for the localization is more mobile and less dependent on the topology of the telecommunications network. This also helps to specificLocation information of mobile phone.
The biggest problem with GPS, which is facing the atmospheric conditions that can change the speed of GPS signals through the ionosphere. This effect is minimized when the satellite is directly above and more to the skyline.
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