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R message fields:
R -------------------------------------------------------------------------------
R | DESIGNATOR | FIELD | INDICATION |
R -------------------------------------------------------------------------------
R | AA | address | contains the A/C mode S address |
R | | announced | |
R | | | |
R | AC | altitude | information containing the A/C altitude |
R | | code | |
R | | | |
R | AP | address | 24-bit address and parity overlaid |
R | | parity | |
R | | | |
R | CA | transponder | reports transponder capability |
R | | capability | |
R | | | |
R | DR | downlink | requests extraction of downlink messages from |
R | | request | the transponder by the interrogator |
R | | | |
R | FS | flight | flight status |
R | | status | |
R | | | |
R | ID | identification | contains the Mode A identification code |
R | | | |
R | MB | message | 56-bit MB field contains the message |
R | | Comm B | transmitted to the interrogator |
R | | | |
R | MD | message | 80-bit MD field contains one segment of a |
R | | Comm D | sequence of segments in the ELM Mode |
R -------------------------------------------------------------------------------
R (c) Data transmitted for elementary surveillance
R The specific data related to the elementary surveillance are the
R following:
R - 24 bits A/C adress (coded in AA field of DF11)
R - flight number (MB field of DF20 or DF21 filled in with Binary
R Data Stores (BDS) 2.0
R - transponder capability report (coded in CA field of DF11)
R - altitude/ground reporting (coded in AC field of DF4 or DF20)
R - flight status (coded in FS field of DF4)
R - RA report (MB field of DF20 or DF21 filled in with BDS 3.0)
R - Surveillance Identifier (SI) (coded in PI field of DF11)
R 1EFF : 051-099, 1 34-52-00Page 50 1 1 May 01/05 1 1 1CES 1
R (d) Data transmitted for enhanced surveillance (if modification 32467
R is validated)
R The specific data related to the enhanced surveillance are the
R following:
R - selected altitude
R - barometric pressure setting
R - roll angle
R - track angle rate
R - true track angle
R - ground speed
R - true air speed
R - magnetic heading
R - indicated airspeed
R - mach
R - barometric altitude rate
R - inertial vertical velocity
R These data are transmitted in MB field of BDS 4.0, 5.0 or 6.0 in
R DF20 or DF21.
R (e) Data transmitted in extended squitters (if modification 32467 is
R validated)
R The specific data related to the extended squitters are the
R following:
R - altitude
R - longitude
R - latitude
R - movement
R - ground track
R - flight number
R - E/W velocity
R - N/S velocity
R - vertical rate
R These data are transmitted in ME field of BDS 0.5, 0.6, 0.8 or
R 0.9 in DF17.
R (4) Operation
R (Ref. Fig. 006A)
R The transponder consists of a receiver, a transmitter, an
R interface/Central Processing Unit (CPU) assembly and a power
R supply/modulator assembly.
R (a) Receiver
R The receiver (top and bottom receiver channels), which consists
R of a ceramic pre-selector filter, self-test coupler, low noise
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