Satellite orbiting the earth

Control and Monitering Stations on earth

GPS receivers owned by Users

The GPS satellite system• It consist of full constellation of 24 satellites

• These satillites are travelling at a speed of 7000 miles per hour

• Transmitter power is only 50 watts or less.

• They complete two complete orbits in less than 24 hours

How GPS Receivers Work?

Position is Based on TimePosition is Based on Time

T + 3

Distance between satellite and receiver = “3 times the speed of light”

T

Signal leaves satellite at time “T”

Signal is picked up by the receiver at time “T + 3”

• 2-D & 3-DTrilateration

Techniques to Improve Accuracy:

• Differential GPS

• Wide Area Augmentation System

• A Local Area Augmentation System

• A Carrier-Phase Enhancement

• Wide Area GPS Enhancement

Im Here

Working of GPS in Vehicles

• It helps in accident prevention .• Identification of repairs in vehile and thus the

informs the driver about problem .• Better navigation• Intimates of the traffic in the near by and also

advices which path to choose

Planning a Navigation RoutePlanning a Navigation Route

Start= Waypoint

Model of vehicle tracking system

Aviation

• Aviators throughout the world use the Global Positioning System (GPS) to increase the safety and efficiency of flight.

• Improved approaches to airports• improved Systems for special aviation applications,

such as landing planes during poor visibility conditions. In those cases, even greater precision operations are possible.

29

GPS enables researchers to explore the Earth environment including the atmosphere, ionosphere and gravity field.

GPS survey equipment has helped in decting natural disasters

Navigation made easy

GPS is a free service and u just need to purchace a device

GPS functionality has now started to move into mobile phones.

• Gps services will be our future Key navigation systems.

• As Gps systems are cost effictive , even a common man can afford them.

• Already gps is use in Major cities in our Country.