CMRT Signal Processing & Antenna Theory 3

Question 1

What is the primary advantage of pulse compression in marine radar?

Accepted Answer

Achieves fine range resolution without requiring a very short transmitted pulse

Answer

Pulse compression transmits a long modulated pulse and compresses it on receive, achieving the range resolution of a short pulse with the energy of a long pulse.

Question 2

Which of the following best describes the polarization of a typical marine radar antenna?

Accepted Answer

Horizontal polarization

Answer

Marine radar antennas use horizontal polarization because it provides better sea clutter rejection compared to vertical polarization.

Question 3

When a radar receiver is described as having a noise figure of 6 dB, this means the receiver adds noise equivalent to:

Accepted Answer

Quadrupling the input thermal noise power

Answer

A 6 dB noise figure means the SNR degrades by a factor of 4 (quadrupling noise power) through the receiver.

Question 4

In FMCW radar used in some marine systems, the target range is determined by:

Accepted Answer

Measuring the frequency difference between transmitted and received signals

Answer

In FMCW radar, the frequency difference (beat frequency) between the linearly swept transmit and receive signals is proportional to target range.

Question 5

What effect does increasing radar antenna height have on maximum detection range?

Accepted Answer

Extends the radar horizon and increases maximum range

Answer

Greater antenna height extends the radar horizon because range to the horizon is proportional to the square root of antenna height.

(CMRT) Certified Marine Radar Technician Practice Test

(CMRT) Certified Marine Radar Technician Practice Test

CMRT Signal Processing & Antenna Theory 3