Spec Flashcards
What is RAPID R? (MASP)
R - Manage System Resources
A - Produces Acoustics Data Display
P - Acoustic Signal Processing
I - Manages Operator Machine Interface OMI
D - Manages Diagnostics
R - Recorder (EADR)
What is DRAAMS? (MASR)
D - Demodulation of signal
R - Radio Frequency Interference Mitigation - RFI
A - Analog to digital conversion
A - Acoustic Test Signal Generation - ATSG
M - Measures Signal Strength
S - Sonobuoy Positioning System - SPS
What is Pre-Whitening?
A form of normalisation. Progressive attenuation of low frequencies.
What is the QEP?
Quad External Pre-Amplifier.
Amplifies sonobuoy signal as soon as it enters the A/C.
What are the factors affecting detection?
Resolution
Normalisation
Integration
What is the cell layout for Narrowband Boxcar?
64, 3, 64
What is the cell layout for Broadband Boxcar?
64, 55, 64
What is the MAS?
Mission Acoustic Subsystem
What are the MAS components in order?
Blade antenna set
QEP (Amplifier)
MASR (Receiver)
MASP (Processor)
EADR (Recorder)
What is QEP?
Quad External Pre-Amplifier
What is MASR?
Mission Acoustics Subsystem Receiver
What is MASP?
Mission Acoustics Subsystem Processor
What is EADR and what is its function?
Embedded Acoustics Data Recorder
1) 2 Chanel ICS recording
2) record/replay 64 channels of acoustic data
By how much does the QEP amplify by? (dBs)
36dB +/- 2dB
What are the types of built in test?
Initiated
Power On
Continuous
What are the display types?
Active
Passive
Environmental
Multi-static
What is the acronym for the MASP?
RAPIDR
What is the acronym for the MASR
DRAAMS
What are the two types of RFI mitigation? (Radio Frequency Interference)
Spacial & spectral
What is ATSG?
Acoustic Test Signal Generation
What are the modes of DIFAR
CSO - Constant shallow OMNI (45ft)
CO - Calibrated OMNI
XCO - Extended calibrated OMNI
DIFAR
What is range gate blanking?
DICASS can’t receive echoes during transmit, so if the SM is inside the pulse length I.E 1667yds @ 1 sec this won’t be seen
What is the generally accepted figure for acoustic velocity? (Speed of sound in ft or yrd’s not M)
5000ft/sec or 1667 yds/sec
What distance does a 1 second continuous wave (CW) cover?
1667 yards
What are the Dicass ping Modes?
CW - Continous wave
FM - Frequency modulated
What are the continuous wave lengths in terms of time?
0.1/0.5/1 second
What does EFS stand for?
Electronic function select
What does CFS stand for?
Command function select
What DIFAR channels are not available and why?
57 & 58 are harmonics of the comms/ICS freq 291.4
What are the properties of the DIFAR Bouy?
SSQ-53G
Size A
9.5kg
0.5/1/2/4/8 hours
90/200/400/1000ft depth
1W RF power output
Channels 1-99 excluding 57&58
What is significant about a longer CW?
The longer the pulse the greater the range but the worse the resolution and reverberation
What type of target is FM better for tracking?
Slow moving masked by reverberation
What channels may cause GPS interference?
49/52/88/90
What are the properties of a DICASS buoy?
SSQ-62 F
A Size
15.9kg
1 hour/50 ping seconds
D1: 50/150/300ft
D2: 90/400/1500ft
1W RF Power output
Channels 1-99 except 57/58
0-370kts and 40-30,000 ft
What is the definition of integration?
The addition of signal power in a spectrum of frequency cells over a period of time
What are the sonic frequencies?
A - 6.5khz - 199dB
B - 7.5khz - 200dB
C - 8.5khz - 201dB
D - 9.5khz - 201dB
What does DICASS give the operator? IN CORRECT ORDER
Bearing
Range
Doppler Velocity
What are the 4 types of display?
Environmental
Active
Passive
Multi-static (not used)
What are the 5 DIFAR channels?
Pilot
Phase reference
OMNI
North/South
East/West
What is Normalisation?
The process of enhancing weak spectral lines above uniform background data.
Or
The kits ability to enhance a frequency line above background noise
What are the properties of a bathybuoy
SSQ-36B
A size
7.3kg
5ft sec sink rate
2625ft/800m depth
Chn 1-99
12 min life
0.25W RF output
0-370kts IAS
40-30,000ft
What is the official name for the MAS?
AQ2
or AN/AQQ-2(V)1
What frequency allows comms with a sonobouy?
291.4mhz
What do the different colours chicklets mean?
White - advisory/parometric
Black - No power
Grey - No response
Cyan - IBIT
Green - Serviceable
Yellow - Degraded
Red - Error/failed
What are the Kilo codes
A - Fully mission capable
B - Minor system degradation
C - Major system degradation
D. Not mission capable
What does a magenta line around the grams mean?
It has been frozen by the operator
What are the 3 factors affecting SOS in water and what are the associated figures
T - Temperature = 6ft/s per °C
S - Salinity = 4.6ft/s per PPT
P - Pressure = 1.6ft/s per 100ft
What is the definition of the sonic layer depth?
The depth of the first maximum sound speed nearest the surface.
What is the drift rate for a sonobuoy with long cable? (1000ft)
5% of wind speed
What is the drift rate for a sonobuoy with a short cable? (90-400ft)
10% of wind speed
What is the fixed rate of salinity in AQ2v
35ppt @39° @sea level 4800ft/sec
What are the 3 types of prop loss
Cylindrical -3dB
Spherical -6dB
Dipolar -12dB
How many data points in Wilson’s algorithm?
640
How many data points are in CML Algorithm?
(Chen/mellor/Li)
30
What is the depth/frequency spectrum of CSO and what is it used for?
45ft
30-5000hz
To exploit Aco data above SLD. DIFAR/Co are inhibited
What is the frequency spectrum of CO/XCO?
CO - 5-20k hz
XCO - 5-40k hz
CSO/DIFAR inhibited during use. Used primarily for ACINT Data collection
What is the frequency spectrum of DIFAR?
5-2560hz
5 hydrophones (NS/EW/OMNI) + pilot 7.5khz and phase ref 15khz
What is the figure for RD (recognition differential)
Minus 6.5db
(becomes a plus in FOM calc)
What are the door operating limitations?
Damage/injury may occur if the door is
A) operated in winds >40kts
B) left open in winds >65kts
How many fire extinguishers are there?
6
How many portable oxygen masks are there?
5 (9 point check)
What is the nominal oxygen system pressure?
1850psi
Where is the flight deck oxgen bottle system?
Electrical Equipment compartment (EEC)
What is the Max POB?
21 (RAF certified)
What is the figure in dB’s for DI? (Directivity index)
5.5dB
How do you reset a Lloyds mirror CPA?
Orange dot/circle top left
What derives the position of the aircraft
MASP
What is the FOM EQUATION
FOM = SL-AN-RD = MDR
What is left after the carrier wave is stripped in the the receiver?
Multiplexed data
What is a SUS and how many codes are there/DB level/life?
Signal underwater sound
Mk84
160db
70 seconds
5 codes