Basic Radar

Question 1

In what frequency band does radar operate in?

Answer 1

VHF and above

Question 2

Define pulse width, or pulse length.

Answer 2

Is the duration of the pulse, which contains a large number of cycles.

Question 3

Define PRP/PRI

Answer 3

Pulse recurrence period is the time interval between each pulses.

Question 4

Define PRF

Answer 4

The number of pulses transmitted in one second

Question 5

Which antenna RPM speed is required for short range?

Answer 5

High RPM speed

Question 6

What is the distance measurement formula for radar?

Answer 6

Distance = speed x time / (1 000 000 us x 2)

Question 7

What is the distance measurement formula for radar in reverse?

Answer 7

distance in meters x 2 / speed of light

Question 8

By what amount must radar power be increased to double the range?

Answer 8

16 times

Question 9

How to calculate the the PRP (or PRI) using a PRF of 400?

Answer 9

1 000 000 microseconds(1 second) / PRF

= PRP/PRI

Question 10

Does the PRI or PRF determined the effective range of radar?

Answer 10

The PRF

Question 11

How to calculate the radar range using a PRF of 400?

Answer 11

1 000 000 microseconds / 400

= The PRI/PRP

speed of light/sec in NM x PRP/PRI / (1 000 000 microseconds x 2)

Question 12

Below what minimum range can a radar not receive a target?

Answer 12

Closer than 150m

Question 13

If the minimum range needs to be increased, does the pulse length need to be reduced or increased?

Answer 13

Reduced

Question 14

What is the minimum wavelength if one wants to avoid clouds and rain absorbing radar energy?

Answer 14

Wavelengths shorter than 3 cm will be absorbed.

Question 15

Does a narrow or wide beam improve radar accuracy?

Answer 15

The narrower a beam, the more accurate.

Question 16

If the PRF(pps) is increased, does range increase or decrease?

Answer 16

Decrease.

Question 17

Does pulse width determine minimum range?

Answer 17

Yes