Merge branch 'bds-61' of git://github.com/tuftedocelot/pyModeS into tuftedocelot-bds-61

This commit is contained in:
Junzi Sun 2020-05-23 19:55:30 +02:00
commit 9c660578ad
3 changed files with 104 additions and 0 deletions

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@ -28,6 +28,7 @@ from pyModeS.decoder.bds.bds06 import (
)
from pyModeS.decoder.bds.bds08 import category, callsign
from pyModeS.decoder.bds.bds09 import airborne_velocity, altitude_diff
from pyModeS.decoder.bds.bds61 import is_emergency, emergency, emergency_squawk
def df(msg):

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@ -0,0 +1,98 @@
# ------------------------------------------
# BDS 6,1
# ADS-B TC=28
# Aircraft Airborne status
# ------------------------------------------
from __future__ import absolute_import, print_function, division
from pyModeS import common
def is_emergency(msg):
"""
Check if the aircraft is reporting an emergency
Non-emergencies are either a subtype of zero (no information) or
subtype of one and a value of zero (no emergency).
Subtype = 2 indicates an ACAS RA broadcast, look in BDS 3,0
:param msg:
:return: if the aircraft has declared an emergency
"""
if common.typecode(msg) != 28:
raise RuntimeError("%s: Not an airborne status message, expecting TC=28" % msg)
mb = common.hex2bin(msg)[32:]
subtype = common.bin2int(mb[5:8])
emergency_state = common.bin2int(mb[8:11])
if subtype == 2:
raise RuntimeError("%s: Emergency message is ACAS-RA, not implemented")
if subtype == 0:
return False
elif subtype == 1 and emergency_state == 0:
return False
else:
return True
def emergency(msg):
"""
Return the aircraft emergency
===== =======
Value Meaning
===== =======
1 General emergency
2 Lifeguard/Medical
3 Minimum fuel
4 No communications
5 Unlawful communications
6 Reserved
7 Reserved
:param msg:
:return: If the aircraft has declared an emergency, the type
"""
if not is_emergency(msg):
raise RuntimeError("%s: Aircraft not declared an emergency" % msg)
else:
mb = common.hex2bin(msg)[32:]
subtype = common.bin2int(mb[5:8])
emergency_state = common.bin2int(mb[8:11])
return emergency_state
def emergency_squawk(msg):
"""
Squawk code of the transmitting aircraft
Emergency value 1 will be squawk 7700
Emergency value 4 will be squawk 7600
Emergency value 5 will be squawk 7500
:param msg:
:return: aircraft squawk code
"""
if common.typecode(msg) != 28:
raise RuntimeError("%s: Not an airborne status message, expecting TC=28" % msg)
mb = common.hex2bin(msg)[32:]
C1 = mb[11]
A1 = mb[12]
C2 = mb[13]
A2 = mb[14]
C4 = mb[15]
A4 = mb[16]
B1 = mb[17]
D1 = mb[18]
B2 = mb[19]
D2 = mb[20]
B4 = mb[21]
D4 = mb[22]
byte1 = int(A4 + A2 + A1, 2)
byte2 = int(B4 + B2 + B1, 2)
byte3 = int(C4 + C2 + C1, 2)
byte4 = int(D4 + D2 + D1, 2)
return str(byte1) + str(byte2) + str(byte3) + str(byte4)

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@ -80,6 +80,11 @@ def test_adsb_velocity():
assert adsb.altitude_diff("8D485020994409940838175B284F") == 550
def test_adsb_emergency():
assert not adsb.is_emergency('8DA2C1B6E112B600000000760759')
assert adsb.emergency_squawk('8DA2C1B6E112B600000000760759') == '6615'
# def test_nic():
# assert adsb.nic('8D3C70A390AB11F55B8C57F65FE6') == 0
# assert adsb.nic('8DE1C9738A4A430B427D219C8225') == 1