Radio Navigation - Radar Principles

4 important questions on Radio Navigation - Radar Principles

Primary pulse radar

Route Surveillance Radar (RSR)
Airport Surveillance Radar (ASR)
Precision Approach Radar (PAR)
Surface Movement Radar (SMR)
(Airborne) Weather Radar (AWR)

Secondary pulse radar

DME
Secondary Surveillance Radar (SSR)

Continuous Wave Primary radar

Low Range Radio Altimeter (LRRA)
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Limitations of Primary Radar

Small targets or targets built of a poor reflecting material, or targets that have a poor aspect ratio, may not be detected.
Radar energy suffers from attenuation, requiring more powerful antennas with large reflectors.
Targets cannot be identified directly.

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