GPS ( Global Positioning System )

History
GPS was initially meant for military applications and was built by the American Department of Defence (DOD) in 1978. It was originally called NAVSTAR and was introduced with the launch of the first satellite.
 
Today, around thirty fully operational satellites orbit the earth covering a distance of 20200 km. These GPS satellites transmit signals which help locate the precise location of a GPS receiver. The latest in efficient satellite technology ensures that the GPS signal can be used without any fee by any individual in possession of a GPS receiver.
 
The predecessor of GPS used to be fixed radio stations spread across the globe in known locations. First, a master station sends out signals after which the slave stations across the globe start to respond. The slave stations send out these signals after a precise amount of time. The receivers then start to evaluate the time delay between the reception of the master and slave signals, thus determining a position relative to the slave stations.
 
Fixed radio station broadcasting was a problem for the military. This is the main reason why Transit, the first navigation satellite, was introduced in the 1960s. The location was determined with the help of a receiver, which calculated the Doppler Effect on the frequency broadcasted by the satellite to the frequency actually received. After this, the receiver closest to the satellite would get information and subsequent readings would precisely single out a location relative to the position of the satellite.
 
Modern satellites work differently to determine exact positions. A satellite signal would include the satellite’s position and the time of signal transmission. With this crucial information, the ground unit would be able to successfully locate a target swiftly and efficiently. Every satellite signal places the ground unit on a sphere from the satellite. The location of the GPS receiver is then identified as the intersection of the spheres (for additional satellite signals).

Comments (25)

 nice one.

Submitted by stevewarne on Tue, 11/01/2011 - 11:17.

 nice one.

 thnx lot!..

Submitted by giga abhi on Thu, 13/01/2011 - 10:06.

 thnx lot!..

Thnx man , nice work :p

Submitted by hunterz342 on Tue, 18/01/2011 - 18:15.

Thnx man , nice work :p

very nice lot info. grab...

Submitted by DIPAK on Thu, 20/01/2011 - 13:00.

very nice lot info. grab...

this is very useful for

Submitted by thiru.govt on Fri, 21/01/2011 - 17:19.

this is very useful for all...

thanks a  lot.it's so useful

Submitted by er_bil on Tue, 01/02/2011 - 16:23.

thanks a  lot.it's so useful

 You are doing a great job

Submitted by AlbTech on Wed, 02/02/2011 - 05:26.

 You are doing a great job guys. Just 4wd.

i want to get circuit diagram

Submitted by SP don on Wed, 02/02/2011 - 12:17.

i want to get circuit diagram and all required details about this gps project

thanks

Excellent work. I will

Submitted by kammenos on Tue, 01/03/2011 - 03:19.

Excellent work. I will feature it in my site

g8 job!!!  

Submitted by balbov on Sat, 05/03/2011 - 21:43.

g8 job!!!

 

nice one & intresting

Submitted by nirav patel on Mon, 07/03/2011 - 16:35.

nice one & intresting

really good.. 

Submitted by vijaykumarkc on Wed, 06/04/2011 - 20:19.

really good..

 

sir i want to do the project

Submitted by chetanjnu on Wed, 27/04/2011 - 01:29.

sir i want to do the project on controlling the electrical home appliences by using gsm.

 

pls help in that.

can you plz give me the pcb+

Submitted by chillout_shiven on Tue, 24/05/2011 - 19:49.

can you plz give me the pcb+  ckt diagram of gps transmitter and receiver or completely assembly of it.

my id  are: s_chauhan_s@yahoo.co.in

way a lot of

Submitted by sunny lagali on Sat, 04/06/2011 - 13:17.

way a lot of information.....

 

good!!

Submitted by Eeshaanee on Sun, 05/06/2011 - 16:55.

good!!

very informative thanx 

Submitted by vinaykambam on Mon, 06/06/2011 - 17:00.

very informative thanx

 

what is the name of this GPS

Submitted by niteshtripathi on Tue, 02/08/2011 - 20:14.
what is the name of this GPS modul??

Very Nice

Submitted by t.gautam411 on Sun, 23/10/2011 - 08:47.

Very Nice

Wowwww........God dammmm...

Submitted by ssudhakar on Fri, 06/01/2012 - 00:05.

Wowwww........God dammmm... This s enough man.... 

thank you......its really got

Submitted by rekhana sarada on Tue, 17/01/2012 - 15:27.

thank you......its really got a good stuff

 

     I want sample code

Submitted by Anonymous on Mon, 23/07/2012 - 19:42.

     I want sample code ....not the bullshit

Everyone knows what's GPS 

 

upload all info.. and ciruit

Submitted by karl aragon on Sat, 17/11/2012 - 00:45.

upload all info.. and ciruit diagram and coding and components

upload all info.. and ciruit

Submitted by karl aragon on Sat, 17/11/2012 - 00:46.

upload all info.. and ciruit diagram and coding and components

 

very nicetank you

Submitted by mahshad on Wed, 21/11/2012 - 13:37.

very nice

tank you

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