Automatic Dependent Surveillance And Multilateration

Question 1

What does ADS B stand for?

Answer 1

Automatic Dependent Surveillance-Broadcast

Question 2

What does ADS B do?

Answer 2

Broadcasts horizontal/vertical position, velocity and other information

Question 3

What can ADS-B be used by?

Answer 3

Aircraft and vehicles

Question 4

Can ADS-B be received by ground facilities?

Answer 4

Yes

Question 5

ADS-B enables a passive system to monitor uniquely, identify and track all targets.

True or False?

Answer 5

True

Question 6

What is ADS-B reliant upon?

Answer 6

Users providing accurate information all of the time

Question 7

What frequency is the extended squitter for ADS-B?

Answer 7

1090MHz

Question 8

What does ASS-B make use of?

Answer 8

SSR frequency and Mode S

Question 9

What are the 4 requirements for aircraft regarding ADS-B?

Answer 9

1) GPS Navigation Capability
2) Mode S Transponder
3) Avionics capable of providing correct data
4) Correct connections between the 3 above

Question 10

How much Does ADS- B cost compared to radar?

Answer 10

0.1%

Question 11

Can ADS-B ground stations can be built in remote areas.

True or False?

Answer 11

True.

Question 12

How are their communications typically linked?

Answer 12

Satellite and microwave

Question 13

ADS-B has two types of messages what are they?

Answer 13

Primary and on event

Question 14

What information is in the primary Type of message in ADS-B?

Answer 14

Position (Surface and Airborne)

• Airborne Velocity
• Aircraft Identification

Question 15

What 3 details are in the “on event” Message in ADS-B?

Answer 15

Trajectory
Status
Test

Question 16

How many messages per second are produced by ADS-B?

Answer 16

6.2 messages per second

Question 17

ADS-B permits high update rates. How many messages per second for Velocity?

Answer 17

2 mps

Question 18

ADS-B permits high update rates. How many messages per second for On event messages?

Answer 18

2 mps

Question 19

ADS-B permits high update rates. How many messages per second for flight identity?

Answer 19

0.2 mps (5 seconds)

Question 20

What is the maximum accuracy category for ADS-B?

Answer 20

7.5m

Question 21

What is the minimum accuracy category for ADS-B?

Answer 21

> 20nm

Question 22

How does ADS-B remove aerial shadowing?

Answer 22

ADS-B can place antennas and GAP fill

Question 23

What does ADS-C stand for?

Answer 23

Automatic Dependent Surveillance Contract

Question 24

What is different about ADS-C?

Answer 24

This relies upon specific contracts being established between the ground system and the aircraft’s avionics via a data link.

Question 25

“C” means that the ground system provides the aircraft with a list of reports to send and specifies when they are required to be sent.
True or False?

Answer 25

True.

Question 26

What are the 3 types of ADS-C contracts?

Answer 26

Periodic
Demand
Event

Question 27

What does MLAT use for its data?

Answer 27

Several antennae on the ground receive broadcasts from aircraft and vehicle mode S transponders

Question 28

What does TDOA stand for?

Answer 28

Time difference of Arrival

Question 29

How does MLAT calculate the position of the aircraft?

Answer 29

Uses a process called Time Difference of Arrival (TDOA)

Question 30

What does MLAT process?

Answer 30

The data encoded in the Mode S and ADS transmitters

Question 31

What are the benefits of MLAT?

Answer 31

Small and cheap antennae easy to install and cheaper to maintain compared to SMR

Provides rapid update and more accurate positions the SMR

Question 32

What does WAM stand for?

Answer 32

Wide Area MLAT

Question 33

Can MLAT be used alongside Radar and ADS?

Answer 33

Yes

Question 34

What are the limitations of MLAT?

Answer 34

Similar to SSR and ADS only detects aircraft or vehicles with Mode S transponders