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Whay are four sattelintes required to determine location?
Three coordinates of spatial position plus time
What are the two ways that GPS signals are encrypted?
What international event prompted the US to make GPS navigation availagle to Civil Aviation?
When the Korean Airline Flight 007 was shot down over Soviet Airspace
What are the three segments of GPS architecture
space, control, user segments
The USAF tracks the satellites rom five monitoring sites. What are they and why are they tracked?
What are the five sources of errors with GPS signals?
errors in clocks and satellites
delays in the ionsphere and troposphere
multipath and receiver noise
degredation of signal
What is WAAS?
Wide Area Augmentation System
laps augmentations to meet needs of civil aviation