Posted by MCQs on MTI, Pulse Doppler Radars
MCQs on MTI, Pulse Doppler Radars, Objectives Questions on MTI, Pulse Doppler Radars
Multiple Choice Questions MTI andPulse Doppler Radar
- The characteristic feature of coherent MTI radars is that the
- transmitted signal should be out of phase with the reference signal in the receiver.
- the transmitted signal should be equal in magnitude to the reference signal.
- the transmitted signal should be coherent with the reference signal in the receiver.
- the transmitted signal should not be equal to the reference signal in the receiver.
Answer: the transmitted signal should be coherent with the reference signal in the receiver.
2. The Doppler frequency shift produced by a moving target may be used in pulse radar to
- combine moving targets from desired stationary objects.
- determine the relative velocity of a target.
- separate desired moving targets from desired stationary objects.
- determine the displacement of a target.
Answer: determine the relative velocity of a target.
3. The limitation of the pulse MTI radar that does not occur with the CW radar
- is blind speed
- is delay lines
- requires more operating powers
- requires complex circuitry
Answer: is blind speed
4. The output of the MTI receiver phase detector should be quantized into a sequence of digital words by using
- a digital quantizer
- a digital phase detector
- digital delay lines
- a digital filter
Answer: digital delay lines
5. A simple MTI delay line canceller is an example of
- a frequency domain filter
- a high-pass filter
- an active filter
- a time-domain filter
Answer: a time-domain filter
6. The effect of blind speed can be significantly reduced in
- pulse MTI radars
- delay line cancellers
- staggered PRF–MTI
- pulse cancellers
Answer: staggered PRF–MTI
7. It provides stated probabilities of detection and false alarm:
- clutter attenuations
- clutter ratio
- cancellation ratio
- clutter visibility factor
Answer: clutter visibility factor
8. An MTI radar that uses amplitude fluctuations is
- coherent
- a pulse Doppler
- non coherent
- a CW radar
Answer: non coherent
9. The blind speeds of two independent radars operating at the same frequency will be different if their
- amplitudes are different
- blind speeds are different
- pulse repetition frequencies are different
- pulse intervals are different
Answer: pulse repetition frequencies are different
10. The clutter-rejection notches may be widened by passing the output of the delay line canceller through a
- Coho
- Stalo
- second delay line canceller
- pulse canceller
Answer: second delay line canceller
11. Two- and three-pulse cancellers are examples of
- CW radars
- FM–CW radars
- MTI filters
- pulse radars
Answer: MTI filters
12. The following techniques are Doppler filtering techniques that reject stationary clutter and where radial velocity is not measured:
- moving target indicator (MTI)
- CW radar
- MTD
- pulse Doppler
Answer: moving target indicator (MTI)
13. The following are regions of Doppler space where targets with those Doppler velocities cannot be detected:
- blind speeds
- delay line cancellers
- staggered PRF
- clutter visibility factor
Answer: blind speeds
14. Ambiguities in range and Doppler velocity can be resolved by transmitting multiple bursts of pulses
- with constant PRF
- with different PRFs
- with two PRFs
- none
Answer: with different PRFs
15. Unambiguous range measurements and ambiguous velocity measurements are caused by
- low PRF
- high PRFs
- medium PRFs
- high PRF
Answer: low PRF
16. Ambiguous range measurements and ambiguous velocity measurements are caused by
- low PRF
- high PRFs
- medium PRFs
- high PRF
Answer: medium PRFs
17. Very ambiguous range measurements and unambiguous velocity measurements are caused by
- low PRF
- high PRFs
- medium PRFs
- high PRF
Answer: high PRF
18. Staggering or changing the time between pulses will
- raise the blind speed
- lower the blind speed
- maintain the same blind speed
- none
Answer: raise the blind speed
19. The following radar does not provide the target velocity estimation:
- Pulse Doppler Radar
- MTI
- both
- none
Answer: MTI
20. The blind speed of an MTI radar can be avoided by
- changing the carrier frequency
- changing the carrier frequency
- changing the carrier frequency
- changing the carrier frequency
Answer: pulse repetition frequency
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