TCAS RA detection function tcas_ra in pyModeS/decoder/bds/bds62.py uses bit 52 of the target state and status information messages (TC = 29, BDS 6,2):
tcas_ra = True if int(mb[52]) == 1 else False
However, according to 2.2.3.2.7.1.3.17 of DO-260B, that bit is used for "TCAS Operational" status.
There is a TCAS RA active flag in the OM part of TC = 31 messages (aircraft operational status, message bit 27). This is BDS 6,5 which is not supported yet.
xoolive
commented
4 months ago
Hello,
TCAS RA detection function
tcas_rain pyModeS/decoder/bds/bds62.py uses bit 52 of the target state and status information messages (TC = 29, BDS 6,2):tcas_ra = True if int(mb[52]) == 1 else FalseHowever, according to 2.2.3.2.7.1.3.17 of DO-260B, that bit is used for "TCAS Operational" status.
There is a TCAS RA active flag in the OM part of TC = 31 messages (aircraft operational status, message bit 27). This is BDS 6,5 which is not supported yet.