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ARPA Test (2024) Quizzes & Ans!!
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ARPA Test (2024) Quizzes & Ans!!What does ARPA stand for? Answer- Automatic Radar Plotting Aid
All ARPAs must provide: Answer- - Range and bearing of target
- Course and speed of target
- Predicted CPA
- Predicted TCPA
ARPAs must be able to automatically track and continuously display information on:
Answer- - 20 targets if fitted with auto acquire
- 10 targets if fitted with manual acquire only
What is smoothing? Answer- When the ARPA processor calculates a vector length
and direction based on a best fit of the scattered positions
Steady state tracking is when there is: Answer- - No maneuver by target
- No maneuver by own ship
Steady state tracking is necessary for __________________ Answer- Accurate
vector presentation
After how long are the oldest observations discarded? Answer- 3 minutes
History dots allow: Answer- - Indication of a maneuver by the target in the recent
past
- Can be an indication of what the target is likely to do in the future
Tail curves show ___________________ Answer- Course alteration
Change in dot spacing show ___________________ Answer- Speed alteration
How many history dots are required for each target? Answer- 4
Uneven do pattern could mean: Answer- - Target maneuver
- Own ship maneuver
- Poor target response
Vectors predict ____________________ Answer- Steady state situation
Relative vectors are used to ______________________ Answer- clearly show a
developing close quarters situation (risk of collision)
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