Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Advanced EW > Day 1 Week 3 > Flashcards

Day 1 Week 3 Flashcards

(55 cards)

Start Studying
1
Q

What is SAR?

A

Synthetic aperture radar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the parameters for fine and coarse resolution?

A 
Fine = 4 inches
Coarse = 3m
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define SAR

A

SAR is a coherent side looking radar system which utilises the flight path of the platform to simulate an extremely large antenna or aperture electronically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Advantages of SAR

A

Doesn’t have to overfly area being mapped
All weather
Day and night

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does a SAR work? 3 types

A

Swath
Spot
Inverse aperture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How does swath work?

A

Transmits pulses at 90 degrees to the flight line at a constantly velocity. Multiple swaths create a strip. Simulates a synthetic array.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Explain spot formation?

A

Uses beam steering to illuminate a designated area longer than normal. Gives better cross range resolution and reduces radar shadow you get with swath.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the system constraints of SAR?

A

Requires large computing power
Cross range resolution, PRF and velocity of platform are all related and cannot be selected independently.
Target motion causes blurring and positional errors
Shadow regions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is CCD?

A

Coherent change detection

Comparison of coherent sar imagery ie passing same area at same speed and path and compares imagery to detect changes. e.g
Sand moving
IEDs 
Foliage movement
BDA
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is ISAR?

A

Inverse synthetic aperture radar

Relies on moving targets whereas SAR relies on static targets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is MTI?

A

Moving target indicator - removes background and stationary clutter
measures doppler shift

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is ground MTI?

A

Provides detection, location and tracking of moving vehicles and slow moving low flying aircraft.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why do we use data links?

A 
Rapid comms in a complex environment
Accuracy
Security
Speed
Clear, unambiguous, easily assimilated
Provide tactical advantage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Difference between digital data link and tactical data link

A 
Digital = agreed format and speed over a common medium
Tactical = Sufficient data close enough to real time (20 seconds)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What will a TDL report?

A

Track
Position, heading, speed, alt
Tactical orders
Sent in defined format

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does a TDL provide support to?

A 
Op intel
Surveillance
Recon
Engagement and weapons status info
Conduit for info exchange
ID of friendly forces
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Basic components of a TDL

A

Sensor
Data handling system
Cryptographic system
Communications system (Tx & Rx)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What mediums can TDL be propagated through?

A

Radio, SatCom, Landline and Microwave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the 3 fundamental types of a TDL system? Explain them simplex/duplex/semi duplex

A

Point to point - simplex, duplex or semi duplex
Broadcast - Simplex
Netted - Duplex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

TDL modes of operation

A

Simplex - one way
Semi duplex - two way but not simultaneously
Duplex - two way simultaneously

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the documentation for data links called?

A

Comms = STANAG 5000 series
Link 11 = Mil-std 6011 / STANAG 5511
Link 16 - Mil-std 6016 / STANAG 5516

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are the brevity codewords for link 11 and 16

A

Link 11 - Alligator

Link 16 - Timber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Explain link 11 properties

Study These Flashcards
A

Semi duplex netted system
Secure radio link UHF - LOS or HF beyond LOS
Exchanges digital info between land, ship and airborne systems

24
Q

What are the link 11 limitations?

Study These Flashcards
A 
Requires network control station & participating units (central hub ie ISTAR platform)
Operates on a single frequency
Not a continuous data transfer (ie slow)
More PU = slower time
All net members receive all data
25
What are the improvements of Link 16 to 11
``` Nodeless Jam resistant Built in encryption Increased data rate Reduced terminal size Secure voice capability Precise participant location and ID ```
26
What are the characterstics of link 16?
Operates in the aeronautical radio navigation frequency band: UHF 969 - 1206 mhz Frequency hopping psuedorandom across 50 frequencies Semi duplex broadcast systems
27
What is J series?
Specially formatted messages designed for link 16
28
What is TDMA? and how is it broken up
Time division multiple access used in link 16 Epochs - Frames - Timeslots Day = 24 hours 112.5 EPOCHS EPOCHS = 64 frames = 12.8 mins = 98304 timeslots 1 Frame = 12 seconds = 1536 timeslots 1 Timeslot = 7.8ms
29
How does TDMA work?
Nodeless so no single unit is key to the operation of the network. Units are allocated timeslots to transmit, receive or relay data. The more data a platform may need to send/receive, the more time it will be allocated.
30
How are JTID units categorised?
Command and control C2 - more time slots assigned | Non C2 - Less time slots
31
Ping Pong? (Brevity Code word)
Exchange of Link 11 Information on the datanet
32
Suspect? (Brevity Code word)
A track which is potentially hostile because of its characteristics, behaviour, origin or nationality
33
Hostile? (Brevity Code word)
A track declared to belong to any opposing nation, party group or entity, which by virtue of its behaviour or information collected on it such as characteristics, origin or nationality contributes to threat to friendly forces
34
Bent? (Brevity Code word)
System indicated is inoperative | System is Bent
35
Beanstalk?
Datalink users should check equipment for spurious tracks
36
Prelude? (Brevity Code word)
The reference point from which track positions are reported within a force
37
Sweet? (Brevity Code word)
Opposite of sour - cancels sick or bent | Equipment is operationg efficiently
38
Sour? (Brevity Code word)
Opposite of sweet Equipment indicated is not operating efficiently
39
Cyclops? (Brevity Code word)
Unmanned Aerial Vehicle
40
Assumed Friend? (Brevity Code word)
A track which is assumed to be a friend because of its characteristics, behaviour or origin
41
Friend? (Brevity Code word)
A track belonging to a declared friendly nation
42
Neutral? (Brevity Code word)
A track whose characteristics, behaviour, origin or nationality indicate that it is neither supporting nor opposing friendly forces
43
Bandit? (Brevity Code word)
An aircraft identified as enemy, in accordance with theatre ID criteria. The term does not necessarily imply direction or authority to engage
44
Faker? (Brevity Code word)
A friendly track acting as a hostile for exercise purposes
45
Joker? (Brevity Code word)
A friendly track acting as a suspect for exercise purposes
46
What is the main difference between how Link 11 and Link 16 operate?
Link 11: Network Control Station calls all Participating Units (Roll Call) All PUs reply with their Data When all have replied, the NCS transmits it's own Data Link 16: Nodeless Employs Time Division Multiple Access (TDMA) architecture Epochs > Frames > Time Slots (~8 milliseconds) Units assigned which timeslot to use through Time Slot Assignment Automatic and transparent to the operator
47
Describe Automatic Identification System (AIS) architecture
Is an automatic tracking system used on ships identifies and locates vessels by electronically exchangng data with other nearby ships, AIS base stations and satellites Must be present on: international 300 gross tonnage or more non-international 500 gross tonnage or more
48
What information does AIS provide?
``` Unique Identification Type of Vessel Position, course, speed Voyage details = ports and ETAs Gross Tonnage & Draught ```
49
What are the airborne uses for AIS?
Fishing Fleet Monitoring & Control Maritime Security Search and Rescue (SAR) Fleet and cargo tracking
50
What is IBS?
Integrated Broadcast Service Provides real time or near real time intelligence data Delivered via UHF or Satcom Provided in common format to all users
51
Types of IBS?
``` IBS-I = Interactive IBS-S = Simplex ```
52
Explain Ship-Shore-Ship Buffer (SSSB)
Real-time data link buffer system that supports data exchange between naval forces
53
Explain SSSB Operations
SSSB nominated sit will establish: Link 1 Connectivity with Control Reporting Centre (CRC) Link 11 Connectivity with airborne/naval units
54
What are the limitation of SSSB
Not all Link 11 data received can be forwarded on to Link 1 | Further coordination may be required through voice
55
What is Ground MTI used for?
joint intelligence preparation of the environment. indicators and warnings Attack ops

Advanced EW (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions