WorksheetsM13-4 Navigation - Radar
Total questions: 20
Worksheet time: 11mins
Which of the following answers are false regarding secondary Radar systems?
Uses echo returns reflected from the target
Information is obtained from coded pulses
they use lower power compared to primary radar systems
Target co-operation not required
True or False
With regard to a Pulse Radar System. The return echo of a closing target would have a decreased frequency than the transmitted frequency
Flase
True
True or False
A Secondary Radar system requires 2 Radars to operate
True
False
Resonant Cavity Coupling can be achieved using Loop Coupling which interacts with:
the H (magnetic) field
the E (electric) field
the Wall Currents
Why would a dented waveguide require replacement?
Waveguides rely on their dimension to propagate certain frequencies
the dent will cause a change in the operating frequency
the dent will cause an internal pressure increase damaging the connecting components
the dent will allow transition power to radiate from the waveguide
What component is used to absorb microwave energy without reflections?
Dummy Load
Flexible Joint
Rotating Joint
Slot Coupled Attenuator
What is the purpose of a Choke Flange Joint
To provide an Electrical short circuit between to waveguides
To provide an magnetic short circuit between to waveguides
To provide an capacitive circuit between to waveguides
To provide an inductive circuit between to waveguides
Polarisation is relative to the earth and is determined from the plane in the beam that contains;
the electrical field
the magnetic field
the largest frequency
the largest amplitude
Minimum Range determined by...
Pulses radiated
Pulse width
PRF
Pulse doppler
Maximum Range is determined by...
PRF
Pulse time
Pulse modulation
PRT
When a secondary radar is use for identification purposes, the transponder is located in the
aircraft
radar beacon
air traffic control radar
ground surveillance radar
To convey EM energy at frequency of 10GHZ, the appropriate transmission line should be _________ .
Open Wire
Coaxial Cable
Single Core Transmission Cable
Waveguide
Which one of the following is NOT a function of receiver?
Amplification
Noise figure measurement
Filtering
Demodulation
What is the time for a radar mile?
16.2 microseconds
6.66 microseconds
300 microseconds
What sort of PRF will be set for long range target detection.
Which of the following characteristics are effected by pulse width?
Radial accuracy
Range resolution
Minimum range
Maximum range
Receiver Noise
What does beam width limit?
Select all correct answers
Accuracy in azimuth
Resolution in azimuth
Resolution in vertical
Accuracy in vertical
What is the minimum length for the wide dimension of a waveguide?
2λ
λ
4λ
2λ
4λ
what type of waveguide joint is shown?
choke
short
open
sealled
What characteristic of semiconductor devices is used for microwave generation?
Negative resistance
Positive resistance
Slow transition rate
