RADAR PRINCIPLES

Question 1

1. The factor which determines the maximum range of a radar is:

Answer 1

pulse repetition rate

Question 2

2. The main advantage of continuous wave radars is:

Answer 2

no minimum range limitation

Question 3

3. If the PRF of a primary radar is 500 pulses per second, the maximum range will be:

Answer 3

162 nm

Question 4

4. To double the range of a primary radar would require the power to be increased by a factor of:

Answer 4

16

Question 5

5. The time between the transmission of a pulse and the reception of the echo from a target is 1720 microseconds. What is the range of the target?

Answer 5

258 km

Question 6

6. A radar is required to have a maximum range of 100 nm. What is the maximum PRF that will achieve this?

Answer 6

810 pss

Question 7

7. If the PRI of a radar is 2100 microseconds, the maximum range of the radar is:

Answer 7

170 nm

Question 8

8. To improve the resolution of a radar display requires:

Answer 8

a narrow pulse width and a narrow beam width

Question 9

9. An advantage of a phased array (slotted antenna) is:
   a. better resolution.
   b. less power required.
   c. reduced sidelobes and clutter.
   d. all of the above.

Answer 9

all of the above

Question 10

10. An echo is received from a target 900 microseconds after the pulse was transmitted. The range to the target is:

Answer 10

73 nm

Question 11

11. The factor which limits the minimum detection range of a radar is:

Answer 11

pulse width

Question 12

12. The use of Doppler techniques to discriminate between aircraft and fixed objects results in second trace returns being generated. These are removed by:

Answer 12

jittering the PRF

Question 13

13. A radar is designed to have a maximum range of 12 km. The maximum PRF that would permit this is:

Answer 13

12500 pps

Question 14

14. The bearing of a primary radar is measured by:

Answer 14

searchlight principle