http___hr.365electric.com_global-positioning-systems_handheld-gps_1016025486.html_1.xml
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The Global Positioning System (GPS) is a network of about 30 satellites orbiting the Earth at an altitude of 20,000 km. The system was originally developed by the US government for military navigation but now anyone with a GPS device, be it a SatNav, mobile phone or handheld GPS unit, can receive the radio signals that the satellites broadcast. Wherever you are on the planet, at least four GPS satellites are ‘visible’ at any time. Each one transmits information about its position and the current time at regular intervals. These signals, travelling at the speed of light, are intercepted by your GPS receiver, which calculates how far away each satellite is based on how long it took for the messages to arrive. Once it has information on how far away at least three satellites are, your GPS receiver can pinpoint your location using a process called trilateration. Trilateration Imagine you are standing somewhere on Earth with three satellites in the sky above you. If you know how far away you are from satellite A, then you know you must be located somewhere on the 'A' circle. If you do the same for satellites B and C, you can work out your location by seeing where the three circles intersect. This is just what your GPS receiver does, although it uses overlapping spheres rather than circles. The more satellites there are above the horizon the more accurately your GPS unit can determine where you are.
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sustava za globalno pozicioniranje ( GPS ) je izvorno razvijen od strane američke mornarice kako bi se vodič podmornica . GPS sustav je bio otvoren za nonmilitary koristi , počevši u 1983 , iakosustav nije proglašen potpuno dovršena do 1995 . Ručni GPS prijemnik je jedan tip uređaja koji koristi GPS satelitski sustav kako bi se utvrdilo njegovo mjesto na svijetu . Kako Global Positioning System Works GPS uređaji rade primajući podatke o položaju od satelita koji kruže oko Zemlje . Oni koriste svoje satelitske veze triangulirati svoj položaj na Zemlji . Više satelitaGPS prijamnik može povezati s ,točnije može odrediti svoj položaj . Ručni GPS jedinica prima signale od najmanje tri satelita može odrediti svoje zemljopisne dužine i širine . Akouređaj ima kontakt s najmanje četiri satelita , to također može pružiti visinu . Koristi za Ručni GPS jedinica Milijuni ručnih GPS prijemnika su u koristiti , zajedno s milijunima drugih vrsta GPS uređaja . Većina ručnih GPS jedinica položaju parcela i spremanje lokalne ili regionalne karata . Ručni GPS prijamnici mogu prikazati položaj koordinate unesenih od strane korisnika ili korisniku reći svoj položaj . Planinari i kamperi koristiti ručni jedinice na parceli njihov položaj na karti , a ljubitelji geocaching koristiti ih kako bi pronašli zalihe . Kartografi koristiti ručni jedinice kad izmjere zemljišta . Ručni uređaji mogu ponuditi navigaciju , ali većina su dizajnirani jednostavno odrediti položaj uređaja vrlo precizno . From:http://hr.365electric.com/global-positioning-systems/handheld-gps/1016025486.html