gps, an intoduction

8/14/2019 GPS, An Intoduction

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Global Positioning System

By Sarath Babu


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Global Positioning Systems

GPS is a revolutionary navigation system

24 satellites orbiting the earth Provide location within metres or less anywhere on

the globe.

Now available in many cars as an option

Created and operated by the US Department ofDefense


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More about GPS satellites

Constellation of 27 satellites

(24 active + 3 spare) Orbit 12,600 miles above earth

(10,900 nautical miles)

Satellites in 12 hour orbit

First satellite launched in 1978, 24th became operationalin 1994

Selective availability was removed in May, 2000

Handheld receivers are now much more accurate


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Global Positioning Systems

GPS is a revolutionary navigation system

24 satellites orbiting the earth Provide location within metres or less anywhere on

the globe.

Now available in many cars as an option

Created and operated by the US Department ofDefense


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How does GPS work?

Measuring distance by measuring time

Satellites send coded signals indicating their position

in space and the exact time the signals are being sent

Receivers use the time it takes signal to travel from

satellite to receiver to determine distance fromsatellite to receiver

Information from multiple satellites is used to

determine position through triangulation


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How does GPS work?


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How does GPS work?


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More about GPS receivers

A GPS receiver's job is to locate four

or more satellites, figure out the

distance to each, and use this

information to deduce its own

location. Hand-held receivers for recreational use

with accuracy of 10-15 metres

Vehicle mounted receivers for navigation

or agricultural use with accuracy of < 1

metre

Backpack or tripod mounted receivers for

surveying use with accuracy of 5 10

centimetres


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More about GPS receivers

Receivers require clear line-of-sight; thus, they will not

work indoors or where tall objects obscure the sky


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Whats so cool about GPS?

GPS units

Can be used as a digital compass Can be used to determine ground speed

Can store landmarks (locations)

Can be used for dynamic routing

Can be used for mapping applications


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Applications of GPS

In-vehicle Navigation (car, boat, airplane)

Asset Management Construction

Geologic Research & Mining

Military Navigation and Operations

Mapping & Surveying

Precision Agriculture

Public Health

Public Safety

Wireless Communications


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Integrating GIS and GPS

Collect a series of latitude and longitude points using

GPS receivers

add them into an existing digital map

Skills in

data collection/creation

GPS reading

observation

Digital photos


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Collecting data

Collect data in the field using GPS

Write down point coordinates and additional data observations

- OR -

Use tracking function of your unit to store points, lines, or

polygons, and write down additional observations


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Using the data you collect

Manually enter the coordinates and observations into a

table (Excel, etc.)

Save as a .dbf file

Use Add X,Y or Add Event Theme to create points on your

map

- OR -

Use your GPS unit cable to download the data from theunit to your computer


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World Scenario Developed by the United States Department of Defense, GPS is

officially named NAVSTAR GPS

Other satellite navigation systems in use or various states of

development include:

Beidou China's regional system that China has proposed to

expand into a global system named COMPASS.

Galileo a proposed global system being developed by the

European Union, joined by China, Israel, India, Morocco,

Saudi Arabia, South Korea, and Ukraine, planned to be operational

by 201112.

GLONASS Russia's global system which is being restored to full

availability in partnership with India.

Indian Regional Navigational Satellite System (IRNSS) India's

proposed regional system.

QZSS Japanese proposed regional system, adding better

coverage to the Japanese Islands.
http://en.wikipedia.org/wiki/United_States_Department_of_Defensehttp://en.wikipedia.org/wiki/Beidou_navigation_systemhttp://en.wikipedia.org/wiki/People%27s_Republic_of_Chinahttp://en.wikipedia.org/wiki/COMPASS_navigation_systemhttp://en.wikipedia.org/wiki/Galileo_positioning_systemhttp://en.wikipedia.org/wiki/European_Unionhttp://en.wikipedia.org/wiki/People%27s_Republic_of_Chinahttp://en.wikipedia.org/wiki/Israelhttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Moroccohttp://en.wikipedia.org/wiki/Saudi_Arabiahttp://en.wikipedia.org/wiki/South_Koreahttp://en.wikipedia.org/wiki/Ukrainehttp://en.wikipedia.org/wiki/GLONASShttp://en.wikipedia.org/wiki/Russiahttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Indian_Regional_Navigational_Satellite_Systemhttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/QZSShttp://en.wikipedia.org/wiki/Japanhttp://en.wikipedia.org/wiki/Japanhttp://en.wikipedia.org/wiki/QZSShttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Indian_Regional_Navigational_Satellite_Systemhttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Russiahttp://en.wikipedia.org/wiki/GLONASShttp://en.wikipedia.org/wiki/Ukrainehttp://en.wikipedia.org/wiki/South_Koreahttp://en.wikipedia.org/wiki/Saudi_Arabiahttp://en.wikipedia.org/wiki/Moroccohttp://en.wikipedia.org/wiki/Indiahttp://en.wikipedia.org/wiki/Israelhttp://en.wikipedia.org/wiki/People%27s_Republic_of_Chinahttp://en.wikipedia.org/wiki/European_Unionhttp://en.wikipedia.org/wiki/Galileo_positioning_systemhttp://en.wikipedia.org/wiki/COMPASS_navigation_systemhttp://en.wikipedia.org/wiki/People%27s_Republic_of_Chinahttp://en.wikipedia.org/wiki/Beidou_navigation_systemhttp://en.wikipedia.org/wiki/United_States_Department_of_Defense


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System The Indian Regional Navigational Satellite System

(IRNSS) is an autonomous regional

satellite navigation system being developed by Indian

Space Research Organisation which would be under

total control ofIndian government.

Development

The government approved the project in May 2006, with

the intention it be implemented within six to seven

years. The first satellite of the proposed constellation,

developed at a cost ofRupee 1,600 crore (16 billion

rupees), is expected to be launched in 2009.
http://en.wikipedia.org/wiki/Satellite_navigation_systemhttp://en.wikipedia.org/wiki/Indian_governmenthttp://en.wikipedia.org/wiki/Rupeehttp://en.wikipedia.org/wiki/Crorehttp://en.wikipedia.org/wiki/Crorehttp://en.wikipedia.org/wiki/Rupeehttp://en.wikipedia.org/wiki/Indian_governmenthttp://en.wikipedia.org/wiki/Satellite_navigation_system


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For more information Garmin website

http://www.garmin.com/ Trimble GPS

www.trimble.com/gps

Wikipedia

- http://en.wikipedia.org/wiki/Gps

How stuff works

www.howstuffworks.com
http://www.howstuffworks.com/http://www.howstuffworks.com/


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Queries .


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