update ACAS and BDS61 structures and functions
This commit is contained in:
Junzi Sun
parent
c25c9d6b96
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2e9833148b
@ -10,6 +10,7 @@ except:
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from .decoder import tell
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from .decoder import adsb
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from .decoder import acas
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from .decoder import commb
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from .decoder import bds
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from .extra import aero
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@ -1,155 +1,123 @@
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"""
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Decoding Air-Air Surveillance (ACAS) DF=0/16
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[To be implemented]
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"""
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from __future__ import absolute_import, print_function, division
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from pyModeS import common
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def threat_type(msg):
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def rac(msg: str) -> str:
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"""Resolution Advisory Complement.
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:param msg: 28 hexdigits string
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:return: RACs
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"""
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Determine the threat type indicator
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mv = common.hex2bin(common.data(msg))
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===== =======
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Value Meaning
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===== =======
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0 No identity data in TID
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1 TID has Mode S address (ICAO)
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2 TID has altitude, range, and bearing
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3 Not assigned
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:param msg:
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:return: indicator of threat type
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RAC = []
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if mv[22] == "1":
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RAC.append("do not pass below")
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if mv[23] == "1":
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RAC.append("do not pass above")
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if mv[24] == "1":
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RAC.append("do not pass left")
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if mv[25] == "1":
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RAC.append("do not pass right")
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return "; ".join(RAC)
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def rat(msg: str) -> bool:
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"""RA terminated indicator
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Mode S transponder is still required to report RA 18 seconds after
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it is terminated by ACAS. Hence, the RAT filed is used.
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:param msg: 28 hexdigits string
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:return: if RA has been terminated
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"""
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mb = common.hex2bin(msg)[32:]
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tti = common.bin2int(mb[28:30])
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return tti
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mv = common.hex2bin(common.data(msg))
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mte = int(mv[26])
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return mte
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def threat_identity(msg):
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mb = common.hex2bin(msg)[32:]
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tti = threat_type(msg)
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# The ICAO of the threat is announced
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if tti == 1:
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return common.icao(mb[30:55])
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else:
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raise RuntimeError("%s: Missing threat identity (ICAO)")
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def threat_location(msg):
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def mte(msg: str) -> bool:
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"""Multiple threat encounter.
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:param msg: 28 hexdigits string
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:return: if there are multiple threats
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"""
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Get the altitude, range, and bearing of the threat
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Altitude is the Mode C altitude
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:param msg:
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:return: tuple of the Mode C altitude, range, and bearing
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mv = common.hex2bin(common.data(msg))
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mte = int(mv[27])
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return mte
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def ara(msg: str) -> str:
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"""Decode active resolution advisory.
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:param msg: 28 bytes hexadecimal message string
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:return: RA charactristics
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"""
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mb = common.hex2bin(msg)[32:]
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tti = threat_type(msg)
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# Altitude, range, and bearing of threat
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if tti == 2:
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grey = mb[31] + mb[32] + mb[33] + mb[34] + mb[35] + mb[36] \
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+ mb[38] + mb[38] + mb[39] + mb[40] + mb[41] + mb[42] \
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+ mb[43]
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mode_c_alt = common.gray2alt(grey)
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_range = common.bin2int(mb[44:51])
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bearing = common.bin2int(mb[51:57])
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return mode_c_alt, _range, bearing
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mv = common.hex2bin(common.data(msg))
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mte = int(mv[27])
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def has_multiple_threats(msg):
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"""
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Indicate if the ACAS is processing zero, one, or more than one threat
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simultaneously
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:param msg:
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:return: boolean
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"""
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mb = common.bin2int(msg)[32:]
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mte = mb[27]
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ara_b1 = mb[8]
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if ara_b1 == 0 and mte == 0:
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# There are no active threats
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return False
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elif ara_b1 == 1 and mte == 0:
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# There is a single threat
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return False
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elif mte == 1:
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# There are multiple threats
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return True
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else:
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return False
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def active_resolution_advisories(msg):
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mb = common.bin2int(msg)[32:]
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mte = mb[27]
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ara_b1 = mb[8]
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ara_b2 = mb[9]
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ara_b3 = mb[10]
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ara_b4 = mb[11]
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ara_b5 = mb[12]
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ara_b6 = mb[14]
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ara_b1 = int(mv[8])
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ara_b2 = int(mv[9])
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ara_b3 = int(mv[10])
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ara_b4 = int(mv[11])
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ara_b5 = int(mv[12])
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ara_b6 = int(mv[14])
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ara_b7 = int(mv[15])
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# ACAS III are bits 15-22
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# blah, now what? just return the byte string and leave it up to the user?
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# There are several indicators depending on if the ara_b1 and mte are set
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RA = []
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return mb[8:15]
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if ara_b1 == 1:
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if ara_b2:
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RA.append("corrective")
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else:
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RA.append("preventive")
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if ara_b3:
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RA.append("downward sense")
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else:
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RA.append("upward sense")
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def is_ra_terminated(msg):
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"""
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Indicate if the threat is still being generated. If not, this can be due to
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the threat no longer existing or the aircraft generating the indicator is
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no longer broadcasting an altitude while the threat is still a threat
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:param msg:
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:return: if the threat is terminated
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"""
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mb = common.bin2int(msg)[32:]
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return mb[26] == 1
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if ara_b4:
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RA.append("increased rate")
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if ara_b5:
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RA.append("sense reversal")
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def no_pass_below(msg):
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"""
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Indication to aircraft to pass below or not
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:param msg:
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:return: boolean
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"""
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mb = common.bin2int(msg)[32:]
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return mb[22] == 1
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if ara_b6:
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RA.append("altitude crossing")
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if ara_b7:
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RA.append("positive")
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else:
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RA.append("vertical speed limit")
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def no_pass_above(msg):
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"""
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Indication to aircraft to pass above or not
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:param msg:
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:return: boolean
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"""
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mb = common.bin2int(msg)[32:]
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return mb[23] == 1
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if ara_b1 == 0 and mte == 1:
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if ara_b2:
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RA.append("requires a correction in the upward sense")
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if ara_b3:
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RA.append("requires a positive climb")
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def no_pass_left(msg):
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"""
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Indication to aircraft to pass on the left or not
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:param msg:
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:return: boolean
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"""
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mb = common.bin2int(msg)[32:]
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return mb[24] == 1
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if ara_b4:
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RA.append("requires a correction in downward sense")
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if ara_b5:
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RA.append("requires a positive descent")
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def no_pass_right(msg):
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"""
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Indication to aircraft to pass on the right or not
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:param msg:
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:return: boolean
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"""
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mb = common.bin2int(msg)[32:]
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return mb[25] == 1
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if ara_b6:
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RA.append("requires a crossing")
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if ara_b7:
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RA.append("requires a sense reversal")
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return "; ".join(RA)
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@ -28,7 +28,11 @@ from pyModeS.decoder.bds.bds06 import (
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)
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from pyModeS.decoder.bds.bds08 import category, callsign
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from pyModeS.decoder.bds.bds09 import airborne_velocity, altitude_diff
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from pyModeS.decoder.bds.bds61 import is_emergency, emergency_state, emergency_squawk
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from pyModeS.decoder.bds.bds61_st1 import (
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is_emergency,
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emergency_state,
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emergency_squawk,
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)
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def df(msg):
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@ -2,6 +2,7 @@
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# BDS 6,1
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# ADS-B TC=28
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# Aircraft Airborne status
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# (Subtype 1)
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# ------------------------------------------
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from pyModeS import common
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100
pyModeS/decoder/bds/bds61_st2.py
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100
pyModeS/decoder/bds/bds61_st2.py
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@ -0,0 +1,100 @@
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# ------------------------------------------
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# BDS 6,1
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# ADS-B TC=28
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# Aircraft Airborne status
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# (Subtype 1)
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# ------------------------------------------
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from typing import Tuple
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from pyModeS import common
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from pyModeS.decoder import acas
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def threat_type(msg: str) -> int:
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"""Determine the threat type indicator.
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Value Meaning
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----- ---------------------------------------
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0 No identity data in TID
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1 TID has Mode S address (ICAO)
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2 TID has altitude, range, and bearing
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3 Not assigned
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:param msg: 28 hexdigits string
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:return: indicator of threat type
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"""
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mb = common.hex2bin(common.data(msg))
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tti = common.bin2int(mb[28:30])
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return tti
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def threat_identity(msg: str) -> str:
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mb = common.hex2bin(common.data(msg))
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tti = threat_type(msg)
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# The ICAO of the threat is announced
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if tti == 1:
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return common.icao(mb[30:55])
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else:
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raise RuntimeError("%s: Missing threat identity (ICAO)")
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def threat_location(msg: str) -> Tuple:
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"""Get the altitude, range, and bearing of the threat.
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Altitude is the Mode C altitude
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:param msg: 28 hexdigits string
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:return: tuple of the Mode C altitude, range, and bearing
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"""
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mb = common.hex2bin(common.data(msg))
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tti = threat_type(msg)
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# Altitude, range, and bearing of threat
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if tti == 2:
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altitude = common.altitude(mb[31:44])
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distance = common.bin2int(mb[44:51])
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bearing = common.bin2int(mb[51:57])
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return altitude, distance, bearing
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def has_multiple_threats(msg: str) -> bool:
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""" Indicate if the ACAS is processing multiple threats simultaneously.
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:param msg: 28 hexdigits string
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:return: if there are multiple threats
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"""
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return acas.mte(msg) == 1
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def active_resolution_advisories(msg: str) -> str:
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"""Decode active resolution advisory.
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Uses ARA decoding function from ACAS module.
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:param msg: 28 bytes hexadecimal message string
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:return: RA charactristics
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"""
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return acars.ara(msg)
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def is_ra_terminated(msg: str) -> bool:
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"""Indicate if the threat is still being generated.
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Mode S transponder is still required to report RA 18 seconds after
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it is terminated by ACAS. Hence, the RAT filed is used.
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:param msg: 28 hexdigits string
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:return: if the threat is terminated
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"""
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return acas.rat(msg) == 1
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def ra_complement(msg: str) -> str:
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"""Resolution Advisory Complement.
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:param msg: 28 hexdigits string
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:return: RACs
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"""
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return acas.rac(msg)
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40
tests/test_acas.py
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40
tests/test_acas.py
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@ -0,0 +1,40 @@
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import pyModeS as pms
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msgs = [
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"80E1983958C392E8710C642D0BAD",
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"8609F8E19E90653083FDE096BE26",
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"80011B41F40017D0000012E06B45",
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"808182365813667446EB715E253D",
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"80E1953058AB029BE8F4E60D989E",
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"8667ECFA8FE06B30E59A124D5AEF",
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"80030AA000042C0AD05D6205DB2C",
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"8631A80000373C463B6E7A00008B",
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"80E19131588B146108DE703F3C47",
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"825CC4A0001595C4600030A40000",
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"808182365813667438EB710EB6D8",
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"80A18393581D3655E90354A664B2",
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"8081823658136309B4F22BCB5F8D",
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"80E1953058AB06516E8602756DD8",
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"80E1991058C9063AB6A3E4744DC3",
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"8073EC91840AFCED8F300BE765C5",
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"8571F54AA814BF8130066A19A31D",
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"864070E1990D3B1E78048BAE6987",
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"80E1991058C9063AB6A3E4744DC3",
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"80818298581581F7CAF8C3C1EEA4",
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"80004E98BC90000FF01010951298",
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"8526D57E4D963C92CDEE1B6C7C49",
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"802A613C93F65A7FF803A51B5ADB",
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"85B6C54279B67BE2A0001998FFDA",
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"851944F15881648338D1AF4B7A27",
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"8321014858208000787905B0E800",
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"866DD078EDEBD330404FFFAE9BA5",
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"80E196905AB503260E835D849E35",
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]
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for msg in msgs:
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print("-" * 80)
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print(msg)
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print("ARA", pms.acas.ara(msg))
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print("RAC", pms.acas.rac(msg))
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print("MTE", pms.acas.mte(msg))
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print("RAT", pms.acas.rat(msg))
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