EQT 5 Factors Affecting Radar Cover Flashcards
What is the resolutions of radar
The accuracy of the radar
Why do aerials want a narrow beam
To make targets clearer
What is the usual beam width
2-3 degrees
What is the one in 60 rule?
60nm gives coverage of 2-3nm (dependent on beam width. Is 2 degrees then 2nm etc)
If a narrow beam is required what must the aerial dimensions be
Large!
What do shorter wavelengths do to coverage
More gaps in high coverage but better low coverage
What does the Cosecant Square function/patten do
Avoids wasted energy by only showing the relevant radius of radar coverage
What is a vertical coverage diagram and what does it take into account
Shows the tactical coverage of the radar display
Takes into account
General environment
Atmospheric conditions
What is the unit coverage diagram
Shows the actual coverage after installing at a specific location
Takes into account
Local terrain
Do shorter wavelengths have smaller or greater atmospheric effects
Greater
What is Anoprop
Radar echoes from below normal cover and from ranges in excess of those allowed for in the design of the radar
What are some atmospheric affects which affect radar coverage
Attenuation
reflection/scattering
Ducting
Anoprop
How does pulse recurrence frequency affect radar
The higher pulse recurrence frequency the more hits in target which means a stronger more recognisable return.
What factors affect radar coverage
Aerials Atmospheric effects Transmitter power Pulse recurrence frequency Pulse length
