CMRT Radar Performance Testing & Monitoring 2

Question 1

What is a 'blind sector' on a marine radar display?

Accepted Answer

An area of no radar coverage caused by an obstruction such as a mast or funnel

Answer

A region where automatic target tracking is disabled by the operator

Answer

The area directly astern that cannot be detected due to ship structure

Answer

The minimum range zone where close echoes are suppressed by STC

Question 2

During a radar performance test, what does a decrease in the signal-to-noise ratio indicate?

Accepted Answer

Degraded radar performance, possibly due to a weakening magnetron or increased receiver noise

Answer

Improved receiver sensitivity

Answer

Higher antenna gain than specified

Answer

Better discrimination between closely spaced targets

Question 3

What is the purpose of a calibrated corner reflector during radar performance testing?

Accepted Answer

To provide a known radar cross-section target for range and sensitivity testing

Answer

To absorb radar energy and reduce unwanted interference

Answer

To simulate rain clutter for anti-clutter circuit evaluation

Answer

To measure horizontal antenna beamwidth in the field

Question 4

Bearing (azimuth) resolution of a marine radar is primarily determined by which parameter?

Accepted Answer

Horizontal beamwidth of the antenna

Answer

Transmitted pulse width

Answer

Intermediate frequency bandwidth

Answer

Pulse repetition frequency

Question 5

How does switching to a longer range scale on a marine radar affect the transmitted pulse width?

Accepted Answer

The pulse width increases to improve detection of distant targets

Answer

It has no effect; pulse width is always fixed by the operator

Answer

The pulse width decreases to improve close-range resolution

Answer

The pulse width is controlled only by a separate manual adjustment

Question 6

What is the IMO-specified maximum range error tolerance for marine navigational radar?

Accepted Answer

±1% of the range scale in use or 30 meters, whichever is greater

Answer

±0.1% of maximum range or ±10 meters, whichever is greater

Answer

±5% of the maximum instrumented range on all scales

Answer

±0.5 nautical miles on any range scale selected

Question 7

In radar performance testing, what does 'system sensitivity' refer to?

Accepted Answer

The minimum input signal level that the complete radar system can detect and display

Answer

The ability of the display to render fine target detail

Answer

The rate at which the antenna rotates during normal operation

Answer

The maximum output power of the transmitter at peak load