1.7.1 ROU homework Part 1

On what two frequency bands do radar waves transmit?

X band: 9300-9500MHz & S Band: 2900-3100MHz

Which band of resolution gives the best resolution at close range?

X-Band (3cm) due to smaller horizontal beam widht.

In general, is radar range more accurate than radar bearing?

Yes

Which edge of the radar ring is used to measure range?

inner ring

About how many degrees wide is the typical horizontal beam width on a radar?

2-5 Degrees

What are the steps to Situational Awareness?

Appraise, Plan, Execute, Monitor, Revise

Radars help reduce uncertainty in the collision avoidance process. What other information may be used in the collision avoidance process?

Bridge Watchstanders

Name three purposes of Radar

Collision Avoidance, Navigation, Situational Awareness

What would be the impact of improperly tuning your Radar?

Difficult to use/Clutter/No contact

What control would you use to reduce clutter created by rain squalls?

Fast Time Constant (FTC)

If your radar is not picking up known targets, what controls should you check? Assume no mechanical problems.

Gain

The Radars ability to generate an accurate bearing resolution is primarily controlled by what factor?

Horizontal Beam Width

The Radars ability to discriminate between targets positioned one behind the other is primarily controlled by what factor?

Horizontal Beam Width, Pulse Width

What does RADAR stand for?

Radio Detection and Ranging

What control would you use to reduce clutter created by sea return?

Sensitivity Time Control (STC)

Which pulse length will give better resolution at short range?

Short, focuses on closer objects, updates more often.

Name 3 factors which control the size of the target painted (spot size)?

Size, Material, Cross section

What are some factors that control the maximum distance a target can be detected?

Target Material, cross section, Atmospheric condition

What is the impact of own ship yaw on situation assessment on an unstabilized radar display?

Target will Smear