<h1 align="center">ADS-C Text File</h1>

1. Message Structure

1.1 Flight Information Header

  • Registration: Registration number of the aircraft.
  • ICAO ID: Unique identifier assigned to the aircraft by the International Civil Aviation Organization.
  • ATSU Address: Air Traffic Service Unit Address, which typically includes the area the plane is flying over.
  • Channel Frequency: The frequency channel being used.

1.2 ADS-C Message with FANS Headers and Checksum

Within this message, there are various tags representing different types of data:

Tag 03 (Acknowledgement)

  • Contract Number: A number related to the contract.

Tag 04 (Negative Acknowledgement)

  • Contract Request Number
  • Reason

Tag 05 (Noncompliance Notification)

  • Contract Number

Tag 06 (Cancel Emergency Mode)

  • Emergency Mode Cancelled

Tag 07 (Basic Report)

  • Latitude: Latitude of the aircraft.
  • Longitude: Longitude of the aircraft.
  • Altitude: Current altitude of the aircraft in feet.
  • Timestamp: The time the data was logged.
  • Position accuracy: Accuracy of the positional data.
  • NAV redundancy: Navigation system status.
  • TCAS: Traffic Collision Avoidance System status.

Tag 09 (Emergency Basic report)

Same data structure as Tag 07, but relates to a significant emergency event.

Tag 10 (Lateral Deviation Change Event)

Same data structure as Tag 07, but relates to a significant lateral deviation change event.

Tag 12 (Flight ID)

  • Flight ID: Unique identifier for the flight.

Tag 13 (Predicted Route)

  • Next waypoint:
    • Latitude, Longitude, Altitude, and ETA (Estimated Time of Arrival) for the next waypoint.
  • Next+1 waypoint:
    • Latitude, Longitude, Altitude for the waypoint after the next one.

Tag 14 (Earth Reference Data)

  • True track: The actual path that the aircraft has been following.
  • Ground speed: The speed of the aircraft relative to the ground.
  • Vertical speed: Speed at which the aircraft is ascending or descending.

Tag 16 (Meteorological Data)

  • Wind speed: Current wind speed.
  • True wind direction: The actual direction from which the wind is blowing.
  • Temperature: Current outside temperature in Celsius.

Tag 18 (Vertical Rate Change Event)

Same data structure as Tag 07, but relates to a significant vertical rate change event.

Tag 19 (Altitude Range Event)

Same data structure as Tag 07, but relates to a significant altitude range event.

Tag 20 (Waypoint Change Event)

Same data structure as Tag 07, but relates to a significant waypoint change event.

Tag 22 (Intermediate Projected Intent Group)

  • Distance: Distance to the target location from the current position.
  • True track: Direction or bearing of the path relative to the geographical North (True North).
  • Altitude: Altitude of the point.
  • ETA: Estimated Time of Arrival

Tag 23 (Fixed Projected Intent Group)

  • Lat: Latitude of the point.
  • Lon: Longitude of the point.
  • Alt: Altitude of the point.
  • ETA: Estimated Time of Arrival.

CRC: Cyclic Redundancy Check. A code to ensure data integrity during transmission.

2. Data analysis

2.1 Messages

First message of ADSC: 2023-07-07 15:07:18:1688742438

Last message of ADSC: 2023-10-20 09:10:50:1697793050

  • Total Messages: 227126
  • Decoded messages: 227126
  • Messages with position: 196951 (86.71%)

2.2 Tag Counts and Percentages

  • Tag 07 Basic report: Count: 146537, Percentage: 64.518%
  • Tag 13 Predicted Route: Count: 145311, Percentage: 63.978%
  • Tag 14 Earth Reference data: Count: 74189, Percentage: 32.664%
  • Tag 16 Meteorological data: Count: 60758, Percentage: 26.751%
  • Tag 03 Acknowledgement: Count: 50441, Percentage: 22.208%
  • Tag 14 Air Reference Data: Count: 47818, Percentage: 21.054%
  • Tag 12 Flight ID: Count: 47448, Percentage: 20.891%
  • Tag 20 Waypoint Change Event: Count: 44124, Percentage: 19.427%
  • Tag 19 Altitude Range Event: Count: 6272, Percentage: 2.761%
  • Tag 23 Fixed Projected Intent Group: Count: 1839, Percentage: 0.810%
  • Tag 04 Negative Acknowledgement: Count: 1265, Percentage: 0.557%
  • Tag 22 Intermediate Projected Intent Group: Count: 945, Percentage: 0.416%
  • Tag 05 Noncompliance Notification: Count: 388, Percentage: 0.171%
  • Tag 18 Vertical Rate Change Event: Count: 99, Percentage: 0.044%
  • Tag 10 Lateral Deviation Change Event: Count: 80, Percentage: 0.035%
  • Tag 09 Emergency Basic report: Count: 16, Percentage: 0.007%
  • Tag 17 Airframe Identification Group: Count: 10, Percentage: 0.004%
  • Tag 06 Cancel Emergency Mode: Count: 2, Percentage: 0.001%

2.3 Aircrafts and ATSU addresses

2999 unique aircraft registrations in the file.

Aircraft with the most messages: F-HHUG No of messages: 2216

72 unique ATSU Addresses in the file.

ATSU Adress with most messages: PIKCPYA - Shanwick (55102 messages)