GROUND RADAR

Question 1

1. A primary radar has a pulse repetition frequency of 275 pps. The time interval between the leading edges of successive pulses is:

Answer 1

3.64 milliseconds

Question 2

2. A primary radar system has a pulse repetition frequency of 450 pps. Ignoring pulse width and flyback at the CRT, the maximum range of the radar would be:

Answer 2

180 nm

Question 3

4. The frequency band and rate of scan of Airfield Surface Movement radars are:

Answer 3

SHF; 60RPM

Question 4

5. When carrying out a precision radar approach, talkdown normally ceases at …………… nm from touchdown:

Answer 4

0.5 nm

Question 5

6. A ground based radar with a scanner rotation of 60rpm, a beam width in the order of .5° and a PRF of 10000pps would be:

Answer 5

an Airfield Surface Movement Indicator with a theoretical range of 8nm

Question 6

7. The SHF band has been selected for Airfield Surface Movement Indicator (ASMI) radars in preference to the EHF band because:

Answer 6

the attenuation caused by precipitation is greater in the EHF band and reduces the radar’s effective range and usefulness