Each Omega station transmitted a very low frequency signal which consisted of a pattern of four tones unique to the station that was repeated every ten seconds. Because of this and radionavigation principles, an accurate fix of the receiver's position could be calculated.
Due to the success of the Global Positioning System the use of Omega declined during the 1990s, to a point where the cost of operating Omega could no longer be justified. Omega was permanently terminated on September 30, 1997 and all stations ceased operation.
Satellite navigation receivers reduce errors by using combinations of signals from multiple satellites and multiple correlators, and then using techniques such as Kalman filtering to combine the noisy, partial, and constantly changing data into a single estimate for position, time, and velocity.
The same applies to the use of smart bombs: the operator of a satellite navigationsystem can effectively degrade the performance of smart bombs being used by other states using its satellite navigationsystem to that of gravity bombs, or even offset them from their targets in such a way as to render them useless.
The best known satellite navigationsystem is the United States' Global Positioning System (GPS), and as of 2002 the GPS is the only fully functional satellite navigationsystem.
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