Radar | Calaculations

Question 1

It takes __.__ seconds for a radio wave to travel out and back for each nautical mile of range

Answer 1

12.36

Question 2

The radar speed is ___m per microsecond

Answer 2

300

Question 3

With the time delay being Dt, the range can be found with ___

Answer 3

R = ( c x Dt ) / 2

Question 4

The maximum unambiguous range will be determined firstly by the ___, because ___

Answer 4

PRF, pulses have to return to the transmitter before the neext ones are sent.

Question 5

Range ambiguity will occur when the time taken for an echo to return from a target is ___ the pulse repetition time

Answer 5

greater than

Question 6

To increase the unambiguous range, the PRT must be ___, which means ___ the PRF

Answer 6

increase, increase

Question 7

The PRF is limited by range, the formula is Max PRF =

Answer 7

80000 / nm

Question 8

The pulse recurrence period/interval is the time between ___.

Answer 8

pulses

Question 9

The PRP must be long enough for a pulse to go ___. If the PRP is too ___, this cannot happen

Answer 9

out to the target, and return, short

Question 10

PRF is the number of pulses ___

Answer 10

per second

Question 11

A further target requires a ___ PRP and ___ PRF

Answer 11

longer, longer

Question 12

A ___ PRP means more pulses per second, and a ___ PRF

Answer 12

shorter. higher

Question 13

PRF =

Answer 13

1 / PRP

Question 14

The pulse ___ can determine the maximum detection range.

Answer 14

width

Question 15

The pulse energy depends on pulse ___ and output ___

Answer 15

width power

Question 16

A long pulse has ___ energy and returns a ___ signal

Answer 16

more stronger

Question 17

Maximum Theoretical Unambiguous Range in km is found by ___

Answer 17

C / ( 2 x PRF )

Question 18

PRF, with the range known, is found by ___

Answer 18

C / ( 2 x Range (km) )

Question 19

The minimum range is found by the pulse ___, plus the recovery time of the ___.

Answer 19

width, duplexer

Question 20

The minimum range is around ___ the pulse width, as is range resolution

Answer 20

half

Question 21

The Pulse Width/Length will determine the ___

Answer 21

Minimum range

Question 22

The longer the pulse, the ___ the energy content of the pulse, and the ___ the possible range

Answer 22

greater, greater

Question 23

A longer pulse allows for the selection of a ___ frequency

Answer 23

lower

Question 24

The minimum achievable range is slightly more than ____ of the pulse length

Answer 24

one half

Question 25

If very low values of minimum range are required, then the pulse must be very ___

Answer 25

dhort

Question 26

Higher frequencies are ___ prone to attenuation

Answer 26

more

Question 27

The best theoretical range can be achieved with a ___ pulse length, ___ PRF, and ___ transmitter power

Answer 27

longer, short, increased