# gps - GLOBAL POSITIONING SYSTEM PRESENTED BY: CG

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GLOBAL POSITIONING SYSTEM PRESENTED BY: CG www.powerpointpresentationon.blogspot.com

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Contents Introduction Basics of GPS GPS elements GPS error source Technological advancement in GPS References
Introduction GPS is the Global positioning system is to determine your position on earth :east- west north-south and vertical(longitude,latitude and altitude). GPS is provided on mid 1990. Today many different standard was used which are WAAS LAAS DGPS NDGPS. DGPS is used to correct bias errors at one location with major bias error at one position. Local area augmentation system focus its service on the airport area. It work using very high frequency radio data link.

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GPS block satellite
Basics of GPS In order to understand how the GPS system works we use for this high school physics. If we send out a pulse of sound or radio waves then we can determine resistance of object by dividing the time it took for reply by the speed of sound. Distance = speed * time Time = Distance/ Speed GPS works on much the same principle. GPS satellite only transmit timing data pulse, GPS receive units, only receive.

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Shouting From the Stars The GPS works on this principle, although it uses much more precise clocks and the speed of light. If each GPS unit had to have an atomic clock, it would be expansive. With three satellites we can solve three of these four variables. X, Y = Horizontal Position Z = Altitude T = Time With only three satellites and an imprecise clock, we have to assume altitude to be a known constant. Eg: Sea level. Since we can only solve for three variables using three satellites X , Y and Time. But if we have four visible satellites we can solve for all four variables X, Y, Z and T.
Contd- GPS signals work in microwaves bands. They can pass through glass, but are absorbed by water molecules and reflect off concrete, steel and rock.

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## This note was uploaded on 01/05/2012 for the course ECEN 212 taught by Professor Hamilton during the Fall '11 term at BYU.

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gps - GLOBAL POSITIONING SYSTEM PRESENTED BY: CG

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