61 lines
1.2 KiB
Python
61 lines
1.2 KiB
Python
# ------------------------------------------
|
|
# BDS 2,0
|
|
# Aircraft identification
|
|
# ------------------------------------------
|
|
|
|
from ... import common
|
|
|
|
|
|
def is20(msg: str) -> bool:
|
|
"""Check if a message is likely to be BDS code 2,0
|
|
|
|
Args:
|
|
msg (str): 28 hexdigits string
|
|
|
|
Returns:
|
|
bool: True or False
|
|
"""
|
|
|
|
if common.allzeros(msg):
|
|
return False
|
|
|
|
d = common.hex2bin(common.data(msg))
|
|
|
|
if d[0:8] != "00100000":
|
|
return False
|
|
|
|
# allow empty callsign
|
|
if common.bin2int(d[8:56]) == 0:
|
|
return True
|
|
|
|
if "#" in cs20(msg):
|
|
return False
|
|
|
|
return True
|
|
|
|
|
|
def cs20(msg: str) -> str:
|
|
"""Aircraft callsign
|
|
|
|
Args:
|
|
msg (str): 28 hexdigits string
|
|
|
|
Returns:
|
|
string: callsign, max. 8 chars
|
|
"""
|
|
chars = "#ABCDEFGHIJKLMNOPQRSTUVWXYZ#####_###############0123456789######"
|
|
|
|
d = common.hex2bin(common.data(msg))
|
|
|
|
cs = ""
|
|
cs += chars[common.bin2int(d[8:14])]
|
|
cs += chars[common.bin2int(d[14:20])]
|
|
cs += chars[common.bin2int(d[20:26])]
|
|
cs += chars[common.bin2int(d[26:32])]
|
|
cs += chars[common.bin2int(d[32:38])]
|
|
cs += chars[common.bin2int(d[38:44])]
|
|
cs += chars[common.bin2int(d[44:50])]
|
|
cs += chars[common.bin2int(d[50:56])]
|
|
|
|
return cs
|