GPS Global Positioning System Overview
The Global Positioning System, usually called GPS, military refers NAVSTAR GPS - Navigation Signal Timing Ranging Global Positioning System. Actually NAVSTAR GPS official GPS. operational satellite navigation system.
The GPS ud determining elses definite location provides highly accurate time reference Earth. accuracy GPS signal if 5 meters (16 ft) 2005 steadily improved or lt 15 years. Using differential GPS or error-correcting techniques, accuracy improved 1 cm (.4 in) short distances.
This controlled United Ss Department Defense anyone, charge.
The GPS satellite-based navigation 24-satellite network placed orbit U.S. Department Defense. sm ft intended military application. 1980s, government me accessible civilian use.
GPS weather conditions, world, 24 hours day. Te subscription fees setup charges GPS.
The GPS sm divided segments: space, control user. space segment includes GPS satellite constellation. control segment comprises ground stations ad world tt charge monitoring flight paths GPS satellites. user segment consists GPS receivers ud bh military civilian applications.
A GPS receiver decodes time signal transmissions fm multiple satellites calculates position trilateration.
The expense maintaining estimated US$400 million year, including replacement aging satellites. ft GPS satellite launched February 1978, recent launch September 2005. GPS satellite sl operation launched February 1989.
Below list ig GPS satellites. GPS satellite launched 1978.
constellation 24 satellites achieved 1994.
satellite built 10 years. Replacements constantly bg built launched io orbit.
GPS satellite weighs approximately 2,000 pounds 17 feet solar panels extended.
Transmitter power oy 50 watts less.
Wondering works?
GPS satellites circle earth twice day accurate orbit broadcast signal information earth. GPS receivers te ts information triangulation calculate user's exact location. Basically, GPS receiver compares time signal transmitted satellite time received. time difference tells GPS receiver ay satellite is. Now, wh distance measurements fm me satellites, receiver determine user's position display unit's electronic map.
A GPS receiver mt locked signal te satellites calculate 2D position, latitude longitude track movement. Wh satellites view, receiver determine user's 3D position (latitude, longitude altitude). user's position determined, GPS unit calculate information, sh speed, bearing, track, trip distance, distance destination, sunrise sunset time more.
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