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DP > Aset Notes > Flashcards

Aset Notes Flashcards

1
Q

What is the DP Final setup settling period?

A

30 minutes.

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2
Q

What is surge and sway measured by?

A

Position Reference Systems (PRS).

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3
Q

What is yaw measured by?

A

Gyro.

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4
Q

What is pitch and roll measured by?

A

-Motion Reference Unit (MRU).
-Vertical Reference System (VRS).

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5
Q

What is the Max operating angle of a Taut wire?

A

30 Degrees.

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6
Q

What is the range of the Taut wire system dependent on?

A

The water depth due to the max angle.

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7
Q

What happens if the taut wire exceeds its max operating angle?

A

Exceeding the operating angle may result in the weight “skipping” along the seabed.

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8
Q

What is ‘Bilge Keeling’?

A

When the Taut wire touches the hull of the vessel.

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9
Q

What is ARTEMIS used for?

A

Shuttle tankers off take.

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10
Q

What frequency does ARTEMIS use?

A

‘X’ Band 3cm.

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11
Q

What are the disadvantages of using ARTEMIS?

A

-Interference can occur when there are other vessels in the vicinity who are also using ‘X’ Band radars.
-It is a 1:1 system.

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12
Q

What is the accuracy of ARTEMIS?

A

-5-6NM.
-5000m.

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13
Q

How accurate are Tube Reflectors?

A

150-200m.

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14
Q

How accurate are Prism Reflectors?

A

1000m.

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15
Q

What are the disadvantages of Fanbeam/CyScan?

A

-Lenses need routine cleaning.
-Bright lights can confuse the system.
-Target swap can occur (boiler suit reflectors).
-Precipitation can cause range errors to occur.

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16
Q

What does FMCW stand for?

A

Frequency, Modulated, Continuous, Wave

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17
Q

What frequency does FMCW use?

A

‘X’ Band 3cm.

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18
Q

What is the range of FMCW?

A

1000m.

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19
Q

What is the advantage of using FMCW

A

Multi-user system with no interference.

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20
Q

What is the Horizontal Beam Length of RADASCAN?

A

360 Degrees.

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21
Q

What is the Vertical Beam Length of RADASCAN?

A

22 Degrees.

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22
Q

What is the Horizontal Beam Length of RADIUS?

A

90 Degrees.

23
Q

What is the Vertical Beam Length of RADIUS?

A

90 Degrees.

24
Q

How many PRS systems should be used for Class 2/3 vessels?

A

3 or more.

25
Q

What do follow track and follow sub mean?

A

The same thing.

26
Q

What happens when there is a system failure?

A

The system will give thrust inputs based upon the historic data of the model 30 minutes prior to the failure.

27
Q

Who determines what class is required for the project?

A

The charterer.

28
Q

Can a vessel degrade its class?

A

No

29
Q

What are CyScan/Fanbeam

A

Laser Opticals

30
Q

Which DP class must operate with all bus ties open?

A

Class 3.

31
Q

When should wind sensors be taken out of the system?

A

When conducting Heli Ops

32
Q

What is PDOP?

A

Position, Dilution, of Precision

33
Q

How many satellites are needed for global coverage?

A

24 satellites.

34
Q

How many satellites are required for position fixing?

A

4 satellites.

35
Q

What is GPS accuracy?

A

5-10m.

36
Q

What are included in paid GNSS corrections?

A

-1m
-0.2/0.3m
-0.1m

Transmitted via INMARSAT or Spotbeam

37
Q

What is included in free GNSS corrections?

A

-IALA (2m)
-SBAS (4m)
-VHF/UHF/MF (Brazil, Canada).

38
Q

What are the different versions of SBAS?

A
  • US (WAAS).
  • JPN (MSAS).
  • EU (EGNOS).
39
Q

What does dual frequency do?

A

Measures Are Ionospheric Delay.

40
Q

What is the main use of DARPS?

A

Shuttle tanker take off.

41
Q

What does DARPS stand for?

A

Differential Absolute & Relative Position Sensor

42
Q

Where should a ultrasound transponder be placed in relation to the vessel

A

Upwind/Up current.

43
Q

What Gain mode should be used when starting a new operation?

A

Low Gain.

44
Q

What type of system is UTM?

A

Coordinate based system.

45
Q

How many UTM zones are there?

A

60 Zones.

46
Q

Why are false Eastings used?

A

Because surveyors don’t like negative numbers.

47
Q

What percentage of Kalman filter is used to segregate readings?

A

67%.

48
Q

What does HDOP stand for?

A

Horizontal Dilution of Precision.

49
Q

What does HiPAP Stand for?

A

High Precision Acoustic Positioning system.

50
Q

What does an LBL relay?

A

Range only.

51
Q

What does USBL, SSBL & SBL relay?

A

Range and Bearing.

52
Q

How long should the UPS battery back-up last after a mains supply failure?

A

30 minutes.

53
Q

How many PRS’ are required for a class2/3 vessel?

A

3.

DP (2 decks)

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