EO-6

Question 1

What is the Radar Range Equation (RRE)?

Answer 1

An equation used to find the maximum range at which a radar can detect a target under a predetermined set of conditions.

Question 2

Define power transmitted

Answer 2

a pulse transmitted with a certain amount of power, determined by the transmitter.

Question 3

what is power transmitted measured in?

Answer 3

watts

Question 4

as power moves away from an antenna, it will cover an increasingly larger surface area calculated as what?

Answer 4

4 pi R squared

Question 5

what is power density (Pt)?

Answer 5

the amount of power transmitted, spread over the surface area at that range.

Question 6

What is power density measured in?

Answer 6

Meters

Question 7

what is antenna gain (G)?

Answer 7

the amount of power sent in a particular direction, as compared to that which would have been sent in that direction with an isotropic antenna.

Question 8

what is antenna gains unit of measure

Answer 8

it is unitless, it is a ratio

Question 9

What is Radar Cross Section (RCS)?

Answer 9

is used to estimate the surface area that will collect and re-radiate the signal power back to the radar system. (represented by the Greek character sigma)

Question 10

What is the radar cross section (RCS) measured in?

Answer 10

Square meters

Question 11

T/F. The actual area of the antenna is not the same as the effective aperture size (Aeff).

Answer 11

True. Unfortunately, no antenna is 100% efficient.

Question 12

Define the number of pulses integrated (N)?

Answer 12

in the signal processor, there may be a number of pulses integrated in the pulse integrator, they are represented by the letter n.

Question 13

In the radar range equation, what does R-max represent?

Answer 13

The maximum range a radar can detect targets

Question 14

In the radar range equation, what does S-min represent?

Answer 14

The smallest received signal that can be detected

Question 15

Noise within the receiver can be calculated by what formula?

Answer 15

Noise=kTBF

Question 16

k (boltzmann constant) is equal too?

Answer 16

1.38 ×10 ^-23 J/K. J stands for Joules, K stands for Kelvins.

Question 17

What is the Boltzmann constant?

Answer 17

gives a measure of the rate at which energy will fluctuate at certain temperatures.

Question 18

T represents what in the noise equation?

Answer 18

absolute temperature. (measured in kelvins)

Question 19

B represents what in the in the noise equation?

Answer 19

reciever bandwidth

Question 20

T/F The smaller the bandwidth of the reciever, the more noise will be added to the signal.

Answer 20

False. the greater the bandwidth the more noise will be added

Question 21

Noise factor (F)

Answer 21

a measure of the amount of the degradation of the signal as it passes through the receiver. (comparison of the input signal to the output signal, i.e. ratio)

Question 22

Noise figure (NF)

Answer 22

the noise factor expressed in dB

Question 23

Smin is dependent on what?

Answer 23

The noise value. (It must be greater than the noise in order for the radar to detect a target)

Question 24

What is the SNRmin based on?

Answer 24

Desired probability of detection, probability of false alarm

Question 25

What factor makes the Smin greater than the noise?

Answer 25

The SNRmin