Global positioning sysytem

8/2/2019 Global positioning sysytem

1/13

Global Positioning

System


2/13

What I want to talk about?

Definition of GPS.

Determining position.

Applications in military, navigation,surveying...


3/13

Definition:

The Global Positioning System, usually called GPS, is theonly fully-functional satellite navigation system allow smallelectronic devices to determine their location (Longitude,Latitude, and Altitude) in within a few meters using timesignals transmitted along a line of sight by radio fromsatellites. Receivers on the ground with a fixed positioncan also be used to calculate the precise time as areference for scientific experiments.


4/13

NAVSTAR:

The United States Department of Defense developedthe system, officially named NAVSTAR GPS(Navigation Signal Timing and Ranging GlobalPositioning System), and launched the firstexperimental satellite in 1978.


5/13

This taxi in Kyoto equipped with GPSnavigation, is an example of how GPStechnology can be applied in routineactivities.

This is a great little GPS receiver that letsyou know where you are, and where youneed to go. It's Bluetooth so you can useit in your pocket, with your iPAQ orlaptop, and with whichever software yourchoose.
http://linuxbrit.co.uk/gadgets/lg/ipaq_gps.jpghttp://linuxbrit.co.uk/gadgets/


6/13

Accuracy:

The GPS (Global Positioning System) is a"constellation" of at least 24 well-spaced satellites thatorbit around the Earth and make it possible for people

with ground receivers to pinpoint their geographiclocation. The location accuracy is anywhere from 1 to100 meters depending on the type of equipment used .

In coming years it reduce into 1cm with DGPS. TheDGPS eliminates selective availability (SA) andprovides a much more accurate determination oftime and position. The GPS is owned and operated bythe U.S. Department of Defense, but is available forgeneral use around the world.


7/13

Determining Position

A GPS receiver "knows" thelocation of the satellites. Byestimating how far away asatellite is, the receiver also"knows" it is locatedsomewhere on the surfaceof an imaginary sphere

centered at the satellite. Itthen determines the sizes ofseveral spheres, one foreach satellite. The receiveris located where thesespheres intersect.


8/13

Applications:

GPS has different uses such as:

Military

Navigation Mobile satellite communication

Surveying


9/13

Military:

GPS allows accurate targeting of various militaryweapons including cruise missiles and precision-guidedmunitions, as well as improved command and controlof forces through improved location awareness. Thesatellites also carry nuclear detonation detectors, whichform a major portion of the United States NuclearDetonation Detection System. Civilian GPS receiversare required to have limits on the velocities andaltitudes at which they will report coordinates.


10/13

Navigation

GPS is used by people around the world as anavigation aid in cars, airplanes, and ships. PersonalNavigation Devices(PND) such as hand-held GPSare used by mountain climbers and hikers. Gliderpilots use the logged signal to verify their arrival atturn points in competitions. Low cost GPS receiversare often combined with PDAs, cell phones, carcomputers or vehicle tracking systems.. The systemcan be used to automate harvesters, mine trucks,and other vehicles.


11/13

Mobile Satellite

Communications:

Satellite communications systems permit "remotes tocommunicate with "hubs" via satellites. A typicalsystem uses satellites in geosynchronous orbit: thisrequires a directional antenna (usually a "dish") that ispointed at the satellite. When the "remote" is portable,as on a ship or a train, the antenna must be pointedbased on its current location. Essentially all modernantenna controllers incorporate a GPS receiver toprovide this location information.


12/13

Surveying:

More costly and precise receivers are usedby land surveyors to locate boundaries,

structures, and survey markers, and for

road construction. There is also a growingdemand for Machine Guidance such asAutomatic Grade Control systems that useGPS positions plans to automatically control

the blades and buckets of constructionequipment.


13/13

Thank you!By:

Sunetra sadhu

Global positioning sysytem

Documents

Transcript of Global positioning sysytem