Navigation for the masses

Jacobsmeyer, Jay M.
May 2009
Urgent Communications;May2009, Vol. 27 Issue 5, p26
Trade Publication
The article discusses the advantages of using global positioning system (GPS) in navigation. It recounts the history of GPS in which first experimentation was launched in 1978 and was used by the Soviet Union through GLONASS. GPS, a trilateration system, measures the distance from three or more emitters and uses these distances to compute a position estimate. A GPS satellite has L1 and L2 signals on radio frequencies of 1575.75 megahertz (MHz) and 1227.6 MHz.


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