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

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Clemson ag engineer develops GPS software to track soil sampling

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GPS + Galileo = better navigation

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Next-generation GPS from Rand McNally

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Innovation in US Air Force's GPS Control System

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Clearfield School District monitoring vans with GPS

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Discom to use GPS mapping to fix faults in Noida faster | noida ...

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Mar 21, 2017

Elon Musk's SpaceX has landed a $96.5 million contract to launch a military satellite

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Mar 14, 2017

DevOps process reduces GPS OCX development time for Raytheon ...

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Why your GPS-enabled smartwatch may show different data than your friend's

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Mar 19, 2017

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