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Aco Flashcards

1
Q

Bathy details

A

12 mins
2625 ft
36B

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2
Q

Difar depths

A 
45 (40s)
90 (40s)
200 (65s)
400 (100s)
1000 (180s)
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3
Q

Difar details

A

53G
0.5, 1, 2, 4, 8 hours
60+ secs deployment

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4
Q

Dicass details

A

62F
1 hour or 50 pings
Shallow D1 (50, 150, 300)
Deep D2 (90, 400, 1500)

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5
Q

Channels

A

57, 58, 93(Phenomenon)

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6
Q

What is EFS

A

Electronic function select - selecting channels, depths, ect… on the sonobuoy

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7
Q

What is CFS

A

Command function select - Can change details on the buoy via A/C once deployed

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8
Q

4 Sonic Freqs

A

A - 6.5 - 199 dB
B - 200 dB
C - 201 dB
D - 201 dB

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9
Q

What is a consideration with RF Channel D

A

Rain showers @ 10

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10
Q

What can you change via EFS

A

Channel, life, depth, aco sensor mode, auto gain control

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11
Q

What is an EMATT

A

Expendable Mobile ASW Training Target mk39

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12
Q

EMATT Details

A 
3-6 hours endurance 
3-8 kts
SSL only 
500 - 10000 ft 
Min depth 150ft 
12 run plans
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13
Q

What to check on buoys

A

Sonobuoy launch container
Breakout cap
Locking Lugs

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14
Q

Sonobuoy Launch Profile

A 
Launch
Water entry
Float
Depth Select
End of life
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15
Q

What is SUS

A

Signal Underwater Sound
3.3-3.5
5 coded selections
Freefall chute only

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16
Q

What are MLMs

A 
Marine Locator Markers
sea surface reference points
yellow flame/white smoke 
Freefall only 
Mk 25: 13.5 - 18.5
Mk 58: 45 - 55
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17
Q

Describe the racks

A 
rows A-F 
48 Slots (x2)
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18
Q

Describe where the launchers are

A

Starboard: X, Y 2
Port: Z, 1, 3

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19
Q

Yellow buoy on panel

A

Next Buoy

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20
Q

White buoy on panel

A

To load

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21
Q

Green buoy on panel

A

Loaded

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22
Q

Filled blue icon on panel

A

unpressurised

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23
Q

No fill icon

A

Pressurised

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24
Q

Freq pilot

A

7.5

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25
Phase ref
15
26
omni ref
2.9
27
What is the multiplexer
Combines all signals and data
28
What is RF Modulation
Puts data on a carrier wave and amplifies
29
What is FFT
Fast Fourier Time - Converts analogue to digital signal
30
What is Nyquist freq
Is the centre frequency/upper limit before aliasing occurs
31
What is aliasing and how do we counter act it
Aliasing is mirroring frequencies. | It is solved via an anti-aliasing filter
32
What are the factors affecting detectability
Resolution Integration Normalisation
33
The bandwidth should be .... the sample rate
1/2
34
Resolution is
the ability to distinguish between 2 frequencies of similar strength that are close together
35
Data collection time is
The time it takes to resolve a frequency 1/R=DCT
36
Finer the resolution ...
the longer the DCT
37
When would you have different resolutions
One for tracking (More res) | One for CPA (Less res)
38
3 types of cell matching
under resolved over resolved matched
39
Integration is
The ability to detect weaker lines . Looks at signal to noise ratio. 25% new data, 75% old
40
What value is classed as Effective integration
Effective integration over 1
41
How to calculate BT Product
Res x 2 x Integration time constant
42
Gram sweep rate times
1.25 2.5 5 10
43
What is the main thing to consider with integration
Time lag/contact lag
44
Normalisation is
Reducing large dynamic ranges to optimise target information
45
How does normalisation work
The sliding box car average. Center box car (Odd), skip one either side, side cars even.
46
Multiplexing is
the combination of data/signals
47
Modulator is
Putting the combined signals on a carrier wave
48
Name 5 components on the MAS
``` Blade antenna set (4) QEP (Behind E840) EADR (E860 RHS) MASRS MASP ```
49
What is time division multiplexing
the use of time difference between signals hitting the antenna set to determine sonobuoy positioning
50
QEP is
Quad external pre-amplifier Provides signal conditioning and amplification by 36 Db +/- 2 Behind E840 floor level
51
How does the flow of aco information occur
Antenna set - QEP - MASRS - MASP - MCDS
52
6 things the MASRS does
Demodulation RFI (Radio freq interference - protects from interference Analogue to Digital and demodulation ATSG (End to end test) Measures RF Scan (Measures VHF signal strength 0-6) SPS (Sonobuoy positioning system)
53
What is the SPS
Sonobuoy Positioning sytem Estimates buoy position, with GPS is known as blended
54
RFI 4 options
Radio freq interference | off, Spectral (Certain Freq), Spatial (Certain Area), both
55
ATSG IS
Acoustic Test Signal Generate Difar signal is sent to test Freq, Bearing, Signal to noise ratio. 32 is good
56
MASP elements
``` manages system Resources produces Acoustic data displays acoustic signal Processing manages operator machine Interface manages Diagnostics hosts EADR ```
57
Where is the EADR
Within the MASP
58
Where is the MASRS located
E860 TOP RHS
59
MASP/EADR location
E860 BOTTOM RHS
60
2 Drives in the EADR (SSDs)
1 - Acoustic operational Flight program AOFP (1 hour saved) | 2 - Records ICS, Post mission analysis, inflight replay via masp, quick erase capability
61
Types of Display
Active Passive Multi-static Environmental
62
MASP means
Mission Acoustics Subsystem Processor
63
MASP front panel info
Red guarded Flash erase button LED: BIST (green), Overtemp (red), Fan Fail (red) Power Switch
64
CFS info
Commands sent through ICS, Channel 291.4m
65
What is the MASPs job
RAPID-R | sends and receives from MCDS
66
Explain managing resources
Manages MASRS and its state EADR DICASS/ICS interface SPS, A/C pos signals between MCDS
67
Explain Manages ADD Function
PEP input Formats displays E.G: Passive, DICASS, Attack (Both), environmental
68
Explain Acoustic signal processing
``` Data fusion (Combination of data from sources) History buffer (AOFP, instant recall) Tactical alerts (sets a ditection threshold, min discernible signal, alerts) Manage Signal processing data (Passive,active,env) ```
69
Integration types
LTI SLTI STI
70
MDR
Range at wish 50% chance of detection on a single buoy
71
Explain Manage operator machine interface (omi)
PEPs | ADDs
72
explain Diagnostics
BIT - Tests signals, Manual IBIT, | 3 tables in health status: MAS status, End to End test, diagnostics
73
Channels that we can't use
57, 58, 93
74
What can you select on the EFS
RF, Life, Depth, Sensor, Auto gain control
75
Which channels give us GPS interference
49-52 and 88-90
76
GPS at 33.5khz
Constant shallow omni Calibrated Omni Difar mode
77
GPS at 45khz
Extended calibrated omni
78
Constant Shallow Omni
at 45ft | Omni directional
79
Calibrated omni
3ft above difar Package For recording and post flight 5-20khz
80
Extended calibrated omni
5-40khz
81
"No Compass"
Directional
82
2 difar beam patterns
Cardiod Null (Filters noise down a particular bearing/cardoid) Figure 8 Null (2 beams suggest)
83
AGC
Auto Gain Control 3 channels - omni, N/S, E/W A1 - ACG Slow A2 - ACG fast or off
84
What are the main pulse modes
Frequency modulated | Continuous wave
85
FM pulse lengths and minimum decay/detection range
1 sec | 1667/833 yds
86
Continuous wave types
CW Short 0.1s 167/83 yds CW Medium 0.5s 833/416 yds CW Long 1s 1667/833 yds
87
Range gate blanking depends on
Pulse Transmission length | Sound Velocity
88
Longer pulse duration
Greater range, increased reverberation (Range), Less range resolution
89
FM pulse Ramped..
Ramped up in frequency from 200hz above and below sonic frequency
90
What is FM good for
Useful against low speed targets in reverberation
91
What is the 3 min rule
Distance covered in yards in 3 mins | Add 2 zeros = distance in 3 mins
92
2000 yards =
1 nm
93
RF Power Output on buoys
1 Watt
94
How does the SPS Work
Time Delay Beam forming
95
Grey chicklet
No response
96
White Chicklet
Parametric/software transition
97
What is considered deep water
More than 1000ft
98
What is AAIS
Airborne Acoustic Intercept System A PID loaded Active sonor database
99
What is the max SS for Dicass
5
100
What is considered shallow water
0-1000ft
101
RD in the sonor equation on the AC
6.5 dB
102
SFMT
Single Frequency Management Tracker
103
SFMT Line colours
``` Purple = pending Red = Tracking Yellow = non-contributing Orange = Dead-Reckoning ```
104
What factors affect SFMT
No. of buoys providing info Buoy Position SNR
105
What colour are SFMT bearings
Golden Brown
106
What colour are Manual Contact Critera bearings
Blue
107
What colour are automatic bearings
White (Turn off)
108
What colour are Manual Bearing Lines
Green/Cyan
109
Describe the 3 sonobuoy drift lines
Small arrow = less than 2kts Big arrow = 2Kts + T = No drift
110
What does Green, yellow and red colours mean on sonobuoy drift
``` Green = Both feeds Yellow = one feed degraded Red = D/R No Feed ```
111
What do solid and dotted sonobuoy drift lines mean
``` Solid = less than 200 yrds Dotted = More than 200 yrds ```
112
Expanding range circle colours and spigot meanings
orange circle Spigot towards the buoy Doppler high Spigot away from the buoy, doppler low
113
Sus options
``` Attack Danger Emergency Finex Spare ```
114
What is the top screen bottom minimise bar called
ADD Status Bar
115
Name the 4 types of areas for buttonology
MCDS area Common Area PEP Mission Tabs Tier one
116
What is DIP for buoys
Data Investigative pattern
117
What channel/buoy is ATSG done omn?
11
118
Kilo-codes
A - Fully MC B - Minor deg C - Major Deg D - Not MC
119
2 Types of normalisation
Narrowband | Broadband
120
What is the process of doing/reporting of CPAs on the TMA button
Measure CPA - XFER - Verbalise to TACCO - Log
121
What is the limitation with using bearing shift CPAs
You must input a Speed
122
Limitations with angle off the bow/CPA predicts
Uses F0 and Speed from previous CPAs
123
What is the use of STI
Mainband only (1.25/2.5)
124
What do we mean by redundant processing
Unmatched/different update rates (Bad thing)
125
What is LSTI used for ?
Used for verniers (2.5/5/10)
126
What is LTI used for
ALI/BFI (10-300s) | Background information for search and bearings
127
What is the consideration with difar bearing control
Search on LTI Track on LSTI DON'T FORGET TO CHANGE
128
Describe lloyds mirror
Phase difference from surface and bottom bounce broadband
129
What is the 3 min rule
Speed of target, add two 00 = Distance in 3mins | E.G: 20kts = 2000 yards in 3 mins
130
Amn Freqs?
55, 305, 850, 950, 1150
131
How many data points on a bathy, and on the TOMS algorithm
Bathy - 640 points, raw data | TOMS - 30 points, processed
132
HAAWC
High Altitude ASW Weapons Capability
133
TDA
Tactical Decision Aid
134
AAIS
Airborne Acoustic Intercept System Pid loaded sonor database, uses CO,
135
3 types of spreading
cylindrical, spherical, Dipolar
136
ANR
Audio noise reduction - suppress unwanted noise Notch (Removes audio) Assign (Specific Noise you want)
137
LRT
Likelihood Ratio tracker

Week 1 (8 decks)

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