Mode S Radar

Question 1

What is Mode S?

Answer 1

Mode S ‘Select”
More in depth and More of for provided than Mode A + C

Question 2

What does Mode S Elementary Give us?

Answer 2

• Altitude
• Identification
• Position

Question 3

What does Mode S Enhanced give us?

Answer 3

Downlink Aircraft Parameters (DAPs)
- Selected Altitude
- Roll Angle
- Track Angle Rate
- True Track Angle
- Ground Speed
- Magnetic Heading
- Indicated Airspeed (IAS) / Mach no
- Vertical Rate (Barometric rate of climb/descend or
baroinertial)

Question 4

What band does Mode S use?

Answer 4

1030Mhz
1090Mhz

Question 5

Mode S Adress

Answer 5

AC given unique code 24 bit address at “birth”
Reduces fruit and grabling

Question 6

Safety benefits of Mode S Enhanced

Answer 6

• Early recognition of aircraft manoeuvres.
• Detection of level busts.
• Reduction in risk of communication errors.
• Improvement of safety by provision of a more precise prediction of horizontal and vertical aircraft behaviour (i.e., monitoring of altitude changes and the execution of altitude clearances).
• Improvement of safety in high density traffic areas through increased situational awareness.

Question 7

What are the capacity benefits to Mode S?

Answer 7

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

Question 8

Has Mode S improved Pilot positioning?

Answer 8

No

Question 9

What is Mode S Multilaterion?

Answer 9

Mode S Multilateration provides accurate
surveillance and identification of all transponder
equipped aircraft on the airport surface.
Controllers can see each aircraft identification
and position on a dedicated screen.

Question 10

What can we use Mode S Multilatertion for?

Answer 10

To replace ASMGCS systems

Question 11

What is good about Mode S MLAT?

Answer 11

Independent of existing infrastructure.
Improved detection of Mode A/C only aircraft.
Complementary information to position.
(Mode A, Mode C, A/C ID)
Increase accuracy at long range.
Care must be taken not to generate excess
1030/1090MHz FRUIT not to over occupy the Transponder.
(due to selective interrogations)