GPS Circuits

  

 

The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. The GPS project was developed in 1973 to overcome the limitations of previous navigation systems,[1] integrating ideas from several predecessors, including a number of classified engineering design studies from the 1960s. 
 
A GPS receiver calculates its position by precisely timing the signals sent by GPS satellites high above the Earth. Each satellite continually transmits messages that include the time the message was transmitted
precise orbital information (the ephemeris) the general system health and rough orbits of all GPS satellites (the almanac).
 
Three satellites might seem enough to solve for position since space has three dimensions and a position near the Earth's surface can be assumed. However, even a very small clock error multiplied by the very large speed of light the speed at which satellite signals propagate results in a large positional error. Therefore receivers use four or more satellites to solve for the receiver's location and time.
 
The very accurately computed time is effectively hidden by most GPS applications, which use only the location. GPS has become a widely deployed and useful tool for commerce, scientific uses, tracking, and surveillance. GPS's accurate time facilitates everyday activities such as banking, mobile phone operations, and even the control of power grids by allowing well synchronized hand-off switching.
 
 

 

 

News

Global Positioning System (GPS) Innovator, Caltech Trustee Charles Trimble to Receive von Karman Wings Award

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Vehicles transporting PDS stock to have GPS units

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GPS constellation has upgraded control system

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Dec 5, 2016

Hemisphere GNSS Perspective: High-precision positioning products/services

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Dec 5, 2016

Lockheed Martin Advances GPS Ground Control System for US Air Force

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Dec 1, 2016

Airborne Unit Continues to Dominate the Global Military GPS Device ...

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Dec 2, 2016

Is Russia's Government 'Spoofing' GPS Near the Kremlin?

The Daily Dot Is Russia's Government 'Spoofing' GPS Near the Kremlin? The Daily Dot Experts believe the phenomenon is caused by a rogue signal (likely transmitted by the Russian Federal Protection...

Dec 2, 2016

GPS in trucks: GPS mandatory for trucks carrying minerals: Govt ...

Times of India GPS in trucks: GPS mandatory for trucks carrying minerals: Govt ... Times of India The state government on Saturday decided to make installation of GPS (global positioning system) in trucks transporting...

Nov 20, 2016

Europe Launches 4 More Galileo Satellites

Deutsche Welle Europe Launches 4 More Galileo Satellites Fortune The satellites, which blasted off from Europe's spaceport in French Guiana aboard an Ariane 5 rocket at 10.06 AM local time (1306 GMT), will be part...

Nov 17, 2016

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