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BTC 3/24 - EQPS > EQPS - Mode S Radar > Flashcards

EQPS - Mode S Radar Flashcards

1
Q

What is Mode S? (3)

A
  1. A co-operative surveillance technique for air traffic control.
  2. Ground based sensors, and airborne transponders.
  3. Operates in the same band (1030-1090MHz) band as conventional SSR systems
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2
Q

What does Mode S do? (6)

A
  1. Communicate with other A/C
  2. Unique Mode S address for each aircraft. (24-bit address)
  3. Allocated by the State at registration.
  4. An ‘address’ for Mode S radar (IC = Interrogator Code)
  5. Provided by the EUROCONTROL MICA (Mode S Interrogator Code Allocation) Cell
  6. Backward compatible with old systems. (Mode AC)
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3
Q

What does selective interrogation enable? (1)

A

A reduction in FRUITING and GARBLING

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4
Q

What is DAPS? (1)

A

Downlink Aircraft Parameters

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5
Q

What is SSR coverage limited by? (1)

A

Line of sight

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6
Q

How many codes does Mode-S give? (2)

A
  • 16.75 million codes
  • 24-bit address
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7
Q

What 2 stages is Europe implementing Mode S? (2)

A
  1. ELS - Elementary Surveillance
  2. EHS - Enhanced Surveillance
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8
Q

What are the basic functionalities of Mode S? (3)

A
  1. Altitude coded in 25ft increments.
  2. Indication whether aircraft is airborne or on the ground.
  3. Aircraft Identification (call sign) used for Elementary Surveillance.
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9
Q

Is IATA code compatible with Mode S? (1)

A

No

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10
Q

What is selective interrogation? (1)

A

Using the unique 24-bit address, attached to an individual airframe, ATCOs can select each aircraft individually, rather than having a Radar screen cluttered with labels

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11
Q

What does ELS do? (1)

A

Downlinks the call sign used in flight…

ATCOs can co-ordinate with an adjacent unit without referring to Mode-A codes

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12
Q

What does Elementary Surveillance DAPS provide the controller with? (3)

A
  1. Position
  2. Identification
  3. Altitude

“PIA”

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13
Q

What can Enhanced Surveillance can provide the controller with? (1)

A

ELS DAPs plus Heading + Speeds + Selected Altitude

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14
Q

What will Mode-S EHS support? (5)

A
  1. Automatic provision of airborne derived data to enhance ground systems functions including surveillance.
  2. Use of data link to improve efficiency of communications.
  3. Use aircraft derived data for ground based safety nets.
  4. Enhance ATC decision support by using aircraft derived data.
  5. Maintain and improve the quality of surveillance.
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15
Q

What are the 2 types of benefits of Mode-S EHS? (2)

A
  1. Safety benefits.
  2. Capacity benefits.
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16
Q

What does Mode-S EHS provide? (5)

A
  1. Early recognition of aircraft manoeuvres.
  2. Detection of level busts.
  3. Reduction in risk of communication errors.
  4. Improvement of safety by provision of a more precise prediction of horizontal and vertical aircraft behaviour.
  5. Improvement of safety in high density traffic areas through increased situational awareness.
17
Q

What capacity benefits does Mode-S EHS provide? (7)

A
  1. Reduction of both controller and aircrew workload.
  2. Direct provision of up-to-date aircraft parameters to the controller.
  3. Extension of the domain of common reference for aircrew and controller.
  4. Reduction of voice channel occupancy.
  5. Improvement of the capacity of pre-regulation (e.g. sequencing) in terminal sectors.
  6. Reduction of the controller workload by reducing uncertainty concerning expected behaviour of the aircraft.
  7. Improvement of efficiency by allowing for more anticipation in planning of traffic.
18
Q

What is MLAT? (2)

A

Mode S multilateration (MLAT):

Accurate surveillance and identification of all transponder equipped aircraft on the airport surface

19
Q

What can Mode-S provide for TCAS? (3)

A
  1. Better exchange of data for collision avoidance
  2. An on-board computer retains positions, predicts future positions, and rate closure
  3. Calculates the closest point of approach (CPA) and produces a two-level warning of proximity
20
Q

What is TDOA? (1)

A

Time Difference of Arrival
(measured by ground sensors)

21
Q

What are the benefits of MLAT? (4)

A
  1. Independent
  2. Improved selection
  3. Complementary
  4. Increase accuracy

BTC 3/24 - EQPS (12 decks)

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