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
