AS 680/682
Description, Operation and Maintenance Record and Replay
ADS−B
4−61Ed. 10.07
The selection of the required output destination is done with checkboxes. If both checkboxes are disa-
bled, the received data is logged to standard output on that terminal, where the tool is started. The
logging to standard output can be used to pipe the received data to standard input of another tool,
e.g. to the tools ’Replay Raw Data Send Raw Data’ (refer to section 4.6.4) or ’Replay Raw Data Send
Asterix Data’ (refer to section 4.6.5). Later on, it is described, how the ’Replay Raw Data Send Raw
Data’ tool can read from standard input (refer to section 4.6.4.1.1 ).
4.6.3.1.3 RRC Parameter: Logging Format
There is a proprietary format for logging of raw data. The layout of this format consists of:
S the identification of the system area (System Areas Code: SAC)
S the identification of the Ground Station within the system area (System Identification Code: SIC)
S the timestamp, when the telegram has been received at the recording tool (in seconds since mid-
night with a precision of 3 decimal in UTC system time)
S the time of day, when the telegram has been sent by the Ground Station (in seconds since midnight
with a precision of 3 decimal in UTC system time)
S the time of arrival of the downlink telegram at the Ground Station with a precision of 9 decimal for
internal use in a Ground Station specific time.
S the downlink telegram format type
S the world wide unique ICAO−address (Mode S address) of the target in hexadecimal representa-
tion
S the not decoded downlink telegram message in hexadecimal representation
S the confidence bits for internal use in hexadecimal representation
S the signal amplitude for internal use in hexadecimal representation
Example of a logged record in proprietary format:
096 007 70756.591 32449.230 6020.026122437 17 4004C3 8F4004C390B981923FF879000000 −− AA
Logging to ’Screen Output’ can be done in the same format being used for file logging or it can be
chosen a better readable, verbose mode, which contains the same items, but the items are shown
in a list. The Mode S addresses are partially decoded in that case.
The verbose logging format is only applicable for logging to ’Screen Output’ and contains the follo-
wing items:
S the system area code, called source area
S the Ground Station identification, called source id or system identification code
S the mode S address of the sending target
S the time of receipt of the downlink telegram in seconds since midnight in UTC time
S the time of day, when the telegram has been sent from the Ground Station in UTC time
S the time of arrival of the telegram in the Ground Station based on the Ground Station internal clock,
not system time
S the downlink format type
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