Chapter 8 - Introduction to Radar Flashcards
What information can be obtained via radar and by what method?
Range - Echo timing
Relative Radial Velocity - Measuring Doppler shift
Angular Position - Observing direction of echo arrival
Target Identity - Obtained using secondary radar
What band of wavelengths and frequencies do radar signals tend to lie within?
1mm to 1m
VHF to EHF
What are the NATP bands for radar designation?
A to M (increasing frequency, decreasing wavelength from A to M)
What is a Pulse radar?
Transmission concentrated in very short pulses.
Pulses separated by sufficiently long intervals for the radar to switch from transmit to receive.
Echo determines target RANGE.
When does range ambiguity occur for pulse radars?
When the pulse transmit time to the target and back exceeds the interpulse period.
If PRF is too high, more likely to receive target echoes from the wrong pulse transmission.
What causes target echoing area to vary?
The aspect of the aircraft presented to the Radar.
What is Pulse Repetition Interval (PRI)?
Note - PRI is the reciprocal of PRF
What happens as operating frequency increases?
Resolution and Precision Increases
Equipment and weight reduce
Power and Operating Range reduce
Interference increases
What is Pulse Repetition Interval (PRI)?
Note - PRI is the reciprocal of PRF
What are the components of a typical Pulse radar system?
Note - Learn and be able to label diagram in the course manual.
What are the 3 main applications of radar?
Search
Tracking
Fire-control
What does a pulse radar altimeter measure?
The distance to the ground directly below the aircraft
What is the accuracy of a modern radar altimeter?
+/- 1.5ft
What type of radar is a radar altimeter and what are the 3 principal components?
Pulse Radar
Transmitter chain
Receiver chain
Range chain
Note - Learn diagram in course manual
