RADAR Losses

What is range ambiguity in radar?

• Uncertainty in target velocity

• Multiple echoes received from the same target

• Inability to determine the true range due to high PRF

• Incorrect Doppler shift measurement

The maximum unambiguous range of a radar system is directly proportional to:

• Pulse width

• Pulse Repetition Frequency (PRF)

• Pulse Repetition Interval (PRI)

• Transmitter power

If a radar system has a PRF of 10 kHz, what is the approximate maximum unambiguous range?

• 7.5 km
  
  

• 15 km

• 30 km

• 75 km

Which type of loss occurs due to attenuation in the atmosphere?
a)

• 
  Absorption loss
  

• Scattering loss
  

• Propagation loss

• All of the above

Propagation Losses is associated with

• Reflection from the earth’s surface.

• Propagation in atmospheric ducts.

• Attenuation in atmosphere.

• all of the above

The formula for the maximum unambiguous range Rmax

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If PRF is increased, what happens to range ambiguity?
a)

• It decreases

• It remains the same

• It increases

• It is eliminated

A radar operating at 5 kHz PRF has a maximum unambiguous range of approximately:

• 15 km

• 30 km

• 60 km

• 75 km

What is the impact of range ambiguity on radar performance?

• Targets appear at incorrect ranges

• Targets disappear from the display

• Radar cross-section decreases

• Doppler shift is reduced

What is the relationship between pulse repetition interval (PRI) and PRF?

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