EQPS - Design Factors Flashcards
What does a Radar need to identify? (2)
- Range & bearing
- Azimouth
What is Resolution of a radar? (1)
The accuracy of a Radar
What factors determine Radar Coverage? (7)
- Aerial size, shape and height above the ground.
- Size of the target - Primary Radar only.
- Atmospheric conditions.
- Transmitter power.
- Receiver efficiency.
- Pulse Recurrence Frequency (PRF) - Primary Radar only.
- Pulse Length - Primary Radar only
What is an Aerial? (2)
A narrow beam in azimuth combined with a wide beam in elevation is the usual requirement in Air Traffic Control
(Usual beam width: 2-3° at 60nm = Coverage if 2-3nm)
What will a shorter wavelength achieve with radar coverage? (2)
More gaps in high coverage
Better Low coverage
What will a longer wavelength achieve with radar coverage? (2)
Fewer gaps in high coverage
Poorer Low coverage
What would the optimal service volume of a single radar installation cover in a cylindrical area? (1)
60,000ft / 20nm radius
What is a UCD? (2)
Unit Coverage Diagram
Shows the actual coverage of the radar system after it has been installed at a specific location
What is a VCD? (2)
Vertical Coverage Diagram
Display’s the theoretical coverage of the radar display being described
Operational radar procedures are determined
from the…. (1)
UCD
What is Absorption or attenuation? (1)
A reduction in signal strength with distance and time
e.g. Gases and vapours, water droplets. (cloud, fog and hail)
What may reflection, or scattering, by water droplets of a particular size result in? (1)
Some of the radar energy being directed back to the scanner and being displayed as weather clutter
Can bending affect radar energy? (1)
YES
Radar energy is trapped in ‘atmospheric ducts’
What can Super-refraction or anomalous propagation (anoprop) produce? (1)
Radar echoes from below normal cover and from ranges in excess of those allowed for in the design of the radar
What must primary & secondary radar power be? (2)
- Sufficient
- Allow for attenuation
