Other Questions Flashcards
What are the 4 main scan types
Circular
Sector
Raster
Complex (phase array)
What are the different types of tracking scans?
Lobe switching
Monopulse
Conical
Unidirectional center
Common uses of a circular scan
Early warning
Navigation
Surface search
Target acquisition
Where might you use a bit directional sector scan?
Height finders
Costal surveillance
Airborne navigation
What is a palmer raster Scan?
Gives good range, azimuth and elevation
Sometimes referred to as a helical raster
Circles around the raster Scan
What are LORO and COSRO?
Lobe on receive only
Conical on revieve only
Types of passive scanning
What is passive scanning?
Tracking antenna remains on receive only, radar returns from another emitter or steady (non scanning) other feed
Calculation for beamwidth
Beamwidth (degrees) = 70 Wavelength/ diameter of antenna
What can DoA be used for?
Fixing Emitters
De interleaving
Location of threats
Why might we need a smaller beamwidth?
Angular location
Angular discrimination
What is MUF?
Maximum usable frequency
Maximum frequency which can be use given a specific angle of incidence
What is critical angle?
The angle of incidence at which the rays pass through and escape to space
What is the optimum working frequency?
85% of MUF
What is an analogue signal?
Consist of a variable quantity which changes continuously over time
What is a digital signal?
Series of discrete permitted values with time
