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Week 1 > Aco > Flashcards

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
Q

Phase ref

A

15

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26
Q

omni ref

A

2.9

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27
Q

What is the multiplexer

A

Combines all signals and data

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28
Q

What is RF Modulation

A

Puts data on a carrier wave and amplifies

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29
Q

What is FFT

A

Fast Fourier Time - Converts analogue to digital signal

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30
Q

What is Nyquist freq

A

Is the centre frequency/upper limit before aliasing occurs

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31
Q

What is aliasing and how do we counter act it

A

Aliasing is mirroring frequencies.

It is solved via an anti-aliasing filter

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32
Q

What are the factors affecting detectability

A

Resolution
Integration
Normalisation

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33
Q

The bandwidth should be …. the sample rate

A

1/2

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34
Q

Resolution is

A

the ability to distinguish between 2 frequencies of similar strength that are close together

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35
Q

Data collection time is

A

The time it takes to resolve a frequency 1/R=DCT

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36
Q

Finer the resolution …

A

the longer the DCT

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37
Q

When would you have different resolutions

A

One for tracking (More res)

One for CPA (Less res)

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38
Q

3 types of cell matching

A

under resolved
over resolved
matched

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39
Q

Integration is

A

The ability to detect weaker lines . Looks at signal to noise ratio.
25% new data, 75% old

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40
Q

What value is classed as Effective integration

A

Effective integration over 1

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41
Q

How to calculate BT Product

A

Res x 2 x Integration time constant

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42
Q

Gram sweep rate times

A

1.25
2.5
5
10

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43
Q

What is the main thing to consider with integration

A

Time lag/contact lag

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44
Q

Normalisation is

A

Reducing large dynamic ranges to optimise target information

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45
Q

How does normalisation work

A

The sliding box car average. Center box car (Odd), skip one either side, side cars even.

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46
Q

Multiplexing is

A

the combination of data/signals

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47
Q

Modulator is

A

Putting the combined signals on a carrier wave

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48
Q

Name 5 components on the MAS

A 
Blade antenna set (4)
QEP (Behind E840)
EADR (E860 RHS)
MASRS
MASP
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49
Q

What is time division multiplexing

A

the use of time difference between signals hitting the antenna set to determine sonobuoy positioning

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50
Q

QEP is

A

Quad external pre-amplifier
Provides signal conditioning and amplification by 36 Db +/- 2
Behind E840 floor level

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51
Q

How does the flow of aco information occur

A

Antenna set - QEP - MASRS - MASP - MCDS

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52
Q

6 things the MASRS does

A

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)

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53
Q

What is the SPS

A

Sonobuoy Positioning sytem

Estimates buoy position, with GPS is known as blended

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54
Q

RFI 4 options

A

Radio freq interference

off, Spectral (Certain Freq), Spatial (Certain Area), both

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55
Q

ATSG IS

A

Acoustic Test Signal Generate
Difar signal is sent to test Freq, Bearing, Signal to noise ratio.
32 is good

56
Q

MASP elements

A 
manages system Resources
produces Acoustic data displays
acoustic signal Processing 
manages operator machine Interface
manages Diagnostics 
hosts EADR
57
Q

Where is the EADR

A

Within the MASP

58
Q

Where is the MASRS located

A

E860 TOP RHS

59
Q

MASP/EADR location

A

E860 BOTTOM RHS

60
Q

2 Drives in the EADR (SSDs)

A

1 - Acoustic operational Flight program AOFP (1 hour saved)

2 - Records ICS, Post mission analysis, inflight replay via masp, quick erase capability

61
Q

Types of Display

A

Active
Passive
Multi-static
Environmental

62
Q

MASP means

A

Mission Acoustics Subsystem Processor

63
Q

MASP front panel info

A

Red guarded Flash erase button
LED: BIST (green), Overtemp (red), Fan Fail (red)
Power Switch

64
Q

CFS info

A

Commands sent through ICS, Channel 291.4m

65
Q

What is the MASPs job

A

RAPID-R

sends and receives from MCDS

66
Q

Explain managing resources

A

Manages MASRS and its state
EADR
DICASS/ICS interface
SPS, A/C pos signals between MCDS

67
Q

Explain Manages ADD Function

A

PEP input
Formats displays
E.G: Passive, DICASS, Attack (Both), environmental

68
Q

Explain Acoustic signal processing

A 
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
Q

Integration types

A

LTI
SLTI
STI

70
Q

MDR

A

Range at wish 50% chance of detection on a single buoy

71
Q

Explain Manage operator machine interface (omi)

A

PEPs

ADDs

72
Q

explain Diagnostics

A

BIT - Tests signals, Manual IBIT,

3 tables in health status: MAS status, End to End test, diagnostics

73
Q

Channels that we can’t use

A

57, 58, 93

74
Q

What can you select on the EFS

A

RF, Life, Depth, Sensor, Auto gain control

75
Q

Which channels give us GPS interference

A

49-52 and 88-90

76
Q

GPS at 33.5khz

A

Constant shallow omni
Calibrated Omni
Difar mode

77
Q

GPS at 45khz

A

Extended calibrated omni

78
Q

Constant Shallow Omni

A

at 45ft

Omni directional

79
Q

Calibrated omni

A

3ft above difar Package
For recording and post flight
5-20khz

80
Q

Extended calibrated omni

A

5-40khz

81
Q

“No Compass”

A

Directional

82
Q

2 difar beam patterns

A

Cardiod Null (Filters noise down a particular bearing/cardoid)

Figure 8 Null (2 beams suggest)

83
Q

AGC

A

Auto Gain Control
3 channels - omni, N/S, E/W
A1 - ACG Slow A2 - ACG fast or off

84
Q

What are the main pulse modes

A

Frequency modulated

Continuous wave

85
Q

FM pulse lengths and minimum decay/detection range

A

1 sec

1667/833 yds

86
Q

Continuous wave types

A

CW Short 0.1s 167/83 yds
CW Medium 0.5s 833/416 yds
CW Long 1s 1667/833 yds

87
Q

Range gate blanking depends on

A

Pulse Transmission length

Sound Velocity

88
Q

Longer pulse duration

A

Greater range, increased reverberation (Range), Less range resolution

89
Q

FM pulse Ramped..

A

Ramped up in frequency from 200hz above and below sonic frequency

90
Q

What is FM good for

A

Useful against low speed targets in reverberation

91
Q

What is the 3 min rule

A

Distance covered in yards in 3 mins

Add 2 zeros = distance in 3 mins

92
Q

2000 yards =

A

1 nm

93
Q

RF Power Output on buoys

A

1 Watt

94
Q

How does the SPS Work

A

Time Delay Beam forming

95
Q

Grey chicklet

A

No response

96
Q

White Chicklet

A

Parametric/software transition

97
Q

What is considered deep water

A

More than 1000ft

98
Q

What is AAIS

A

Airborne Acoustic Intercept System

A PID loaded Active sonor database

99
Q

What is the max SS for Dicass

A

5

100
Q

What is considered shallow water

A

0-1000ft

101
Q

RD in the sonor equation on the AC

A

6.5 dB

102
Q

SFMT

A

Single Frequency Management Tracker

103
Q

SFMT Line colours

A 
Purple = pending
Red = Tracking
Yellow = non-contributing 
Orange = Dead-Reckoning
104
Q

What factors affect SFMT

A

No. of buoys providing info
Buoy Position
SNR

105
Q

What colour are SFMT bearings

A

Golden Brown

106
Q

What colour are Manual Contact Critera bearings

A

Blue

107
Q

What colour are automatic bearings

A

White (Turn off)

108
Q

What colour are Manual Bearing Lines

A

Green/Cyan

109
Q

Describe the 3 sonobuoy drift lines

A

Small arrow = less than 2kts
Big arrow = 2Kts +
T = No drift

110
Q

What does Green, yellow and red colours mean on sonobuoy drift

A 
Green = Both feeds
Yellow = one feed degraded
Red = D/R No Feed
111
Q

What do solid and dotted sonobuoy drift lines mean

A 
Solid = less than 200 yrds
Dotted = More than 200 yrds
112
Q

Expanding range circle colours and spigot meanings

A

orange circle
Spigot towards the buoy Doppler high
Spigot away from the buoy, doppler low

113
Q

Sus options

A 
Attack
Danger
Emergency 
Finex
Spare
114
Q

What is the top screen bottom minimise bar called

A

ADD Status Bar

115
Q

Name the 4 types of areas for buttonology

A

MCDS area
Common Area PEP
Mission Tabs
Tier one

116
Q

What is DIP for buoys

A

Data Investigative pattern

117
Q

What channel/buoy is ATSG done omn?

A

11

118
Q

Kilo-codes

A

A - Fully MC
B - Minor deg
C - Major Deg
D - Not MC

119
Q

2 Types of normalisation

A

Narrowband

Broadband

120
Q

What is the process of doing/reporting of CPAs on the TMA button

A

Measure CPA - XFER - Verbalise to TACCO - Log

121
Q

What is the limitation with using bearing shift CPAs

A

You must input a Speed

122
Q

Limitations with angle off the bow/CPA predicts

A

Uses F0 and Speed from previous CPAs

123
Q

What is the use of STI

A

Mainband only (1.25/2.5)

124
Q

What do we mean by redundant processing

A

Unmatched/different update rates (Bad thing)

125
Q

What is LSTI used for ?

A

Used for verniers (2.5/5/10)

126
Q

What is LTI used for

A

ALI/BFI (10-300s)

Background information for search and bearings

127
Q

What is the consideration with difar bearing control

A

Search on LTI
Track on LSTI
DON’T FORGET TO CHANGE

128
Q

Describe lloyds mirror

A

Phase difference from surface and bottom bounce broadband

129
Q

What is the 3 min rule

A

Speed of target, add two 00 = Distance in 3mins

E.G: 20kts = 2000 yards in 3 mins

130
Q

Amn Freqs?

A

55, 305, 850, 950, 1150

131
Q

How many data points on a bathy, and on the TOMS algorithm

A

Bathy - 640 points, raw data

TOMS - 30 points, processed

132
Q

HAAWC

A

High Altitude ASW Weapons Capability

133
Q

TDA

A

Tactical Decision Aid

134
Q

AAIS

A

Airborne Acoustic Intercept System

Pid loaded sonor database, uses CO,

135
Q

3 types of spreading

A

cylindrical, spherical, Dipolar

136
Q

ANR

A

Audio noise reduction - suppress unwanted noise
Notch (Removes audio)
Assign (Specific Noise you want)

137
Q

LRT

A

Likelihood Ratio tracker

Week 1 (8 decks)

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