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Level 3 ACTC Unclassified > Acoustic Systems > Flashcards

Acoustic Systems Flashcards

1
Q

AN/AQS-22

A

Dipping Sonar Set/ALFS

  1. Reeling Machine Control Panel
  2. Reeling Machine Interface Unit
  3. Sonar Transmitter/Receiver (ST/R)
  4. Reeling Machine and Cable Reel Assembly
  5. Transducer Assembly (TA)
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2
Q

Acoustic System

A

Sonar detecting ranging set (SDRS)

Acoustic Processor (AP)

Sonobuoy receiver subsystem

Acoustic Mission Planner

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3
Q

Reel and Cable Assembly

A

2550 feet of cable with cable limit sensors (5-8 wraps remaining) and dip cycle counter

Electrical interface for TA and ST/R

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4
Q

Cable Reeling Machine

A

Hydraulic hoist that raises and lowers TA via utility hyd system, driving the gear train assembly, which drives the cable and reel.

Equipped with:

  • auxiliary electric motor and auxiliary hydraulic control system.
  • Cable Cutter
  • Cable Angle sensors for AFCS and flight displays for hover mode
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5
Q

Cable Reeling Machine modes of operation

A
  1. Automatic (remote) Hydraulic Mode
  2. Manual (RMCU) Hydraulic Mode
  3. Auxiliary Hydraulic Mode
  4. Auxiliary Electric Mode
  5. Auxiliary Hardware Electric Mode
  6. Hand Crank Mode
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6
Q

Raise Speed Limiter (RSL)

A

Functions w/servo valve on hyd motor, ensures raise speed does not exceed threshold as it is raised toward the aircraft

  • Does not function during Aux Electric ince electic motor does not use hyd servo valve
  • Does not function during Aux Hyd because RMIU is bypassed (already limited)
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7
Q

Normal Hydraulic Operation

A

Automatic (remote) and Manual (RMCU)

Full capabilities, full safety features

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8
Q

Auxiliary Hydraulic Mode

A

Manually control servo valve, bypassing the RMIU and RMCu

Bypasses all safety interlocks, does not stop at trail or seat or lock the TA.

Limited to 6 ft/sec when TA is w/i 60 feet of the aircraft

Commonly used for correcting miswraps, reseating, or fault/failure

No ESD protect sequence

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9
Q

Auxiliary Electrical Mode

A

Full Safety features

Normal or slow, raise only

115 Vac, 3 phase, 400 Hz power and signals from RMIU

If raised for 1000ft or deeper, cable should be retensioned w/normal hyd mode.

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10
Q

Auxiliary Hardware Electric Mode

A

Bypasses all safety interlocks and RMIU

Controlled directly by RMCU

Normal speed only, 6ft/sec (actual is normally 8.2)

Last resort

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11
Q

Hand Crank Mode

A

Maintenance purposes

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12
Q

RMIU

A

Controls reeling machine functions (stops, speeds, folds, sensors), regulates smooth transitions, performs MBIT

No controls or indicators, interfaces with everything.

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13
Q

RMCU

A

Indicators and controls

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14
Q

TA

A

Transmits sonar pulse generated by ST/R and receive echo returns.

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15
Q

ST/R

A

Generates transmit pulse and provides interface between AP and other SDRS components

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16
Q

Dipping sonar operational states

A

Checkout State

Sonar State

Training State

17
Q

Checkout State

A

Asses operational readiness

  • Power-up Bit
  • Aircraft system commanded BIT
  • RMCU commanded BIT (MBIT lowers and raises TA 3 inches)
18
Q

Sonobuoy Receiver

A

Transmits SB VHF uplink data to AP for display, AMC for audio, and data link for ship down link

  • Software Defined Sonobuoy Receiver (SDSR)
  • Sonobuoy Receiver Antenna
  • Pre-amplifier unity
19
Q

Software Defined Sonobuoy Receiver

A

Reception of eight sonobuoy channels VHF/FM

20
Q

Sonobuoy Receive Antenna

A

Two operating modes

Ship Control- ASTAC
HELO Control - pilots/SO

Operator must detune existing sonobuoys to tune new ones if 8 channels are occupied (auto if BT buoy)

21
Q

BNM

A

Beam noise measurement

22
Q

AP beams/nulls

A

24 beams based on 12 staves

Up to two null point angles

Also null-steering toward continuously present interfering noice

23
Q

Time Varying Gain

A

TVG - decreases front end sensitivity immediately after ping to avoid front end saturation due to strong reverberation returns (sensitivity reduction is 42 dB, decaying to 0 db in 1.8 seconds)

24
Q

AN/SSQ-5F

CFS COMMANDS

A
  1. RF channel
  2. RF power (On/Off)
  3. Life
  4. Hydrophone (Standard DIFAR, shallow omni, or calibrated omni)
  5. Acoustic automatic gain control (AGC) (Fast/Slow/Off)
25
Q

AN/SSQ-62E

CFS COMMANDS

A
  1. RF channel
  2. RF power (On/Off)
  3. Audio (ping) frequency
  4. Depth
26
Q

Passive Sonobuoy Signal Processing

A
  1. LOFAR/DIFAR Omni
  2. DIFAR (Directional)
  3. DIFAR Steered Cardioid
  4. DIFAR Orthogonal Cardioid
  5. DIFAR Synthetic Omni
  6. DEMON (High or Low)
27
Q

LOFAR/DIFAR Omni

A

spectrogram (gram) and automatic line integration (ALI) data for DIFAR

no bearing information

8 simultaneous channels

28
Q

DIFAR (DirectionaL)

A

gram/ALI/BVF on all 8 channels

29
Q

DIFAR Steered Cardioid

A

gram/ALI/BVF for a steered cardioid beam

  1. 77 dB gain
    - 10 dB response
30
Q

DIFAR Orthogonal Cardioid

A

gram/ALI/BVF multiple beams

5 ALI/gram one omni, N, S, E, W

  1. 77 dB gain in cardinal direction
  2. 4 dB gain 45 degrees off cardinal
31
Q

DIFAR Synthetic Omni

A

meant for VLAD

32
Q

DEMON

A

see NTRP 3-22.2

33
Q

Octave Bands

A 
No octaves
Full Band (Octaves 1-8)
Half Band (0-7)
Quarter Band (0-6)
Eighth Band (0-5)
34
Q

Passive processing bands

A

Octave
Vernier
Constant Resolution

16 bands per processing option, each with 256 bins

35
Q

Vernier Bands

A

Two Frequency Resolutions, V4 and V8.

Bin width is a function of vernier center frequency (octave)

256 CR frequency bins for BW of 1/4 of the octave for V4 and 1/2 for V8

36
Q

Constant Resolution Band

A

Bin width fixed, constant resolution frequency

six available (CR4-CR9)

37
Q

Gram Rates

A

1.25
2.5
5
10

Short for dynamic/transient signals
Long for history and stable frequencies

Level 3 ACTC Unclassified (9 decks)

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