390 lines
14 KiB
Python
390 lines
14 KiB
Python
#
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# Copyright 2010, 2012 Nick Foster
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#
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# This file is part of gr-air-modes
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#
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# gr-air-modes is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# gr-air-modes is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-air-modes; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import time, os, sys
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from string import split, join
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from altitude import decode_alt
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import math
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from air_modes.exceptions import *
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from air_modes import cpr
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#this implements a packet class which can retrieve its own fields.
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class data_field:
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def __init__(self, data):
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self.data = data
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self.fields = self.parse()
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types = { }
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offset = 1 #field offset applied to all fields. used for offsetting
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#subtypes to reconcile with the spec. Really just for readability.
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#get a particular field from the data
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def __getitem__(self, fieldname):
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mytype = self.get_type()
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if mytype in self.types:
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if fieldname in self.fields: #verify it exists in this packet type
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return self.fields[fieldname]
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else:
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raise FieldNotInPacket(fieldname)
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else:
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raise NoHandlerError(mytype)
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#grab all the fields in the packet as a dict
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#done once on init so you don't have to iterate down every time you grab a field
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def parse(self):
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fields = {}
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mytype = self.get_type()
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if mytype in self.types:
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for field in self.types[mytype]:
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bits = self.types[self.get_type()][field]
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if len(bits) == 3:
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obj = bits[2](self.get_bits(bits[0], bits[1]))
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fields.update(obj.parse())
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fields.update({field: obj})
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else:
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fields.update({field: self.get_bits(bits[0], bits[1])})
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else:
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raise NoHandlerError(mytype)
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return fields
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def get_type(self):
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raise NotImplementedError
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def get_numbits(self):
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raise NotImplementedError
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#retrieve bits from data given the offset and number of bits.
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#the offset is both left-justified (LSB) and starts at 1, to
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#correspond to the Mode S spec. Blame them.
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def get_bits(self, *args):
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startbit = args[0]
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num = args[1]
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try:
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bits = (self.data \
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>> (self.get_numbits() - startbit - num + self.offset)) \
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& ((1 << num) - 1)
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#the exception handler catches instances when you try to shift more than
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#the number of bits. this can happen when a garbage packet gets through
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#which reports itself as a short packet but of type long.
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#TODO: should find more productive way to throw this out
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except ValueError:
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bits = 0
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return bits
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class bds09_reply(data_field):
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offset = 6
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types = { #BDS0,9 subtype 0
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0: {"sub": (6,3), "dew": (10,1), "vew": (11,11), "dns": (22,1),
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"vns": (23,11), "str": (34,1), "tr": (35,6), "dvr": (41,1),
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"vr": (42,9)},
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#BDS0,9 subtypes 1-2 (differ only in velocity encoding)
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1: {"sub": (6,3), "icf": (9,1), "ifr": (10,1), "nuc": (11,3),
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"dew": (14,1), "vew": (15,10), "dns": (25,1), "vns": (26,10),
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"vrsrc": (36,1), "dvr": (37,1), "vr": (38,9), "dhd": (49,1), "hd": (50,6)},
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#BDS0,9 subtype 3-4 (airspeed and heading)
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3: {"sub": (6,3), "icf": (9,1), "ifr": (10,1), "nuc": (11,3), "mhs": (14,1),
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"hdg": (15,10), "ast": (25,1), "spd": (26,10), "vrsrc": (36,1),
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"dvr": (37,1), "vr": (38,9), "dhd": (49,1), "hd": (50,6)}
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}
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def get_type(self):
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sub = self.get_bits(6,3)
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if sub == 0:
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return 0
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if 1 <= sub <= 2:
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return 1
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if 3 <= sub <= 4:
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return 3
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def get_numbits(self):
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return 51
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#type 17 extended squitter data
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class me_reply(data_field):
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#types in this format are listed by BDS register
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#TODO: add comments explaining these fields
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types = { 0x05: {"ftc": (1,5), "ss": (6,2), "saf": (8,1), "alt": (9,12), "time": (21,1), "cpr": (22,1), "lat": (23,17), "lon": (40,17)}, #airborne position
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0x06: {"ftc": (1,5), "mvt": (6,7), "gts": (13,1), "gtk": (14,7), "time": (21,1), "cpr": (22,1), "lat": (23,17), "lon": (40,17)}, #surface position
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0x07: {"ftc": (1,5),}, #TODO extended squitter status
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0x08: {"ftc": (1,5), "cat": (6,3), "ident": (9,48)}, #extended squitter identification and type
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0x09: {"ftc": (1,5), "bds09": (6,51, bds09_reply)},
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#0x0A: data link capability report
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#0x17: common usage capability report
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#0x18-0x1F: Mode S specific services capability report
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#0x20: aircraft identification
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0x61: {"ftc": (1,5), "eps": (9,3)}
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}
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#maps ftc to BDS register
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def get_type(self):
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ftc = self.get_bits(1,5)
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if 1 <= ftc <= 4:
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return 0x08
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elif 5 <= ftc <= 8:
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return 0x06
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elif 9 <= ftc <= 18 and ftc != 15: #FTC 15 does not appear to be valid
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return 0x05
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elif ftc == 19:
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return 0x09
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elif ftc == 28:
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return 0x61
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else:
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return NoHandlerError(ftc)
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def get_numbits(self):
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return 56
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#resolves the TCAS reply types from TTI info
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class tcas_reply(data_field):
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offset = 61
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types = { 0: {"tti": (61,2)}, #UNKNOWN
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1: {"tti": (61,2), "tid": (63,26)},
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2: {"tti": (61,2), "tida": (63,13), "tidr": (76,7), "tidb": (83,6)}
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}
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def get_type(self):
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return self.get_bits(61,2)
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def get_numbits(self):
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return 28
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#extended squitter types 20,21 MB subfield
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class mb_reply(data_field):
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offset = 33 #fields offset by 33 to match documentation
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#types are based on bds1 subfield
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types = { 0: {"bds1": (33,4), "bds2": (37,4)}, #TODO
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1: {"bds1": (33,4), "bds2": (37,4), "cfs": (41,4), "acs": (45,20), "bcs": (65,16), "ecs": (81,8)},
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2: {"bds1": (33,4), "bds2": (37,4), "ais": (41,48)},
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3: {"bds1": (33,4), "bds2": (37,4), "ara": (41,14), "rac": (55,4), "rat": (59,1),
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"mte": (60,1), "tcas": (61, 28, tcas_reply)}
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}
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def get_type(self):
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bds1 = self.get_bits(33,4)
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bds2 = self.get_bits(37,4)
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if bds1 not in (0,1,2,3) or bds2 not in (0,):
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raise NoHandlerError(bds1)
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return int(bds1)
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def get_numbits(self):
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return 56
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# #type MV (extended squitter type 16) subfields
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# mv_fields = { "ara": (41,14), "mte": (60,1), "rac": (55,4), "rat": (59,1),
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# "vds": (33,8), "vds1": (33,4), "vds2": (37,4)
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# }
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#the whole Mode S packet type
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class modes_reply(data_field):
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types = { 0: {"df": (1,5), "vs": (6,1), "cc": (7,1), "sl": (9,3), "ri": (14,4), "ac": (20,13), "ap": (33,24)},
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4: {"df": (1,5), "fs": (6,3), "dr": (9,5), "um": (14,6), "ac": (20,13), "ap": (33,24)},
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5: {"df": (1,5), "fs": (6,3), "dr": (9,5), "um": (14,6), "id": (20,13), "ap": (33,24)},
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11: {"df": (1,5), "ca": (6,3), "aa": (9,24), "pi": (33,24)},
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16: {"df": (1,5), "vs": (6,1), "sl": (9,3), "ri": (14,4), "ac": (20,13), "mv": (33,56), "ap": (88,24)},
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17: {"df": (1,5), "ca": (6,3), "aa": (9,24), "me": (33,56, me_reply), "pi": (88,24)},
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20: {"df": (1,5), "fs": (6,3), "dr": (9,5), "um": (14,6), "ac": (20,13), "mb": (33,56, mb_reply), "ap": (88,24)},
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21: {"df": (1,5), "fs": (6,3), "dr": (9,5), "um": (14,6), "id": (20,13), "mb": (33,56, mb_reply), "ap": (88,24)},
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24: {"df": (1,5), "ke": (6,1), "nd": (7,4), "md": (11,80), "ap": (88,24)}
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}
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def is_long(self):
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return self.data > (1 << 56)
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def get_numbits(self):
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return 112 if self.is_long() else 56
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def get_type(self):
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return self.get_bits(1,5)
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class parse:
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def __init__(self, mypos):
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self.my_location = mypos
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self.cpr = cpr.cpr_decoder(self.my_location)
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def parse0(self, data):
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altitude = decode_alt(data["ac"], True)
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return [data["vs"], data["cc"], data["sl"], data["ri"], altitude]
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def parse4(self, data):
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altitude = decode_alt(data["ac"], True)
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return [data["fs"], data["dr"], data["um"], altitude]
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def parse5(self, data):
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return [data["fs"], data["dr"], data["um"], data["id"]]
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def parse11(self, data, ecc):
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interrogator = ecc & 0x0F
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return [data["aa"], interrogator, data["ca"]]
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categories = [["NO INFO", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED"],\
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["NO INFO", "SURFACE EMERGENCY VEHICLE", "SURFACE SERVICE VEHICLE", "FIXED OBSTRUCTION", "CLUSTER OBSTRUCTION", "LINE OBSTRUCTION", "RESERVED"],\
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["NO INFO", "GLIDER", "BALLOON/BLIMP", "PARACHUTE", "ULTRALIGHT", "RESERVED", "UAV", "SPACECRAFT"],\
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["NO INFO", "LIGHT", "SMALL", "LARGE", "LARGE HIGH VORTEX", "HEAVY", "HIGH PERFORMANCE", "ROTORCRAFT"]]
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def parseBDS08(self, data):
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catstring = self.categories[data["ftc"]-1][data["cat"]]
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msg = ""
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for i in range(0, 8):
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msg += self.charmap(data["ident"] >> (42-6*i) & 0x3F)
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return (msg, catstring)
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def charmap(self, d):
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if d > 0 and d < 27:
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retval = chr(ord("A")+d-1)
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elif d == 32:
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retval = " "
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elif d > 47 and d < 58:
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retval = chr(ord("0")+d-48)
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else:
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retval = " "
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return retval
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def parseBDS05(self, data):
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icao24 = data["aa"]
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encoded_lon = data["lon"]
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encoded_lat = data["lat"]
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cpr_format = data["cpr"]
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altitude = decode_alt(data["alt"], False)
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[decoded_lat, decoded_lon, rnge, bearing] = self.cpr.decode(icao24, encoded_lat, encoded_lon, cpr_format, 0)
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return [altitude, decoded_lat, decoded_lon, rnge, bearing]
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#welp turns out it looks like there's only 17 bits in the BDS0,6 ground packet after all.
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def parseBDS06(self, data):
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icao24 = data["aa"]
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encoded_lon = data["lon"]
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encoded_lat = data["lat"]
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cpr_format = data["cpr"]
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ground_track = data["gtk"] * 360. / 128
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[decoded_lat, decoded_lon, rnge, bearing] = self.cpr.decode(icao24, encoded_lat, encoded_lon, cpr_format, 1)
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return [ground_track, decoded_lat, decoded_lon, rnge, bearing]
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def parseBDS09_0(self, data):
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#0: ["sub", "dew", "vew", "dns", "vns", "str", "tr", "svr", "vr"],
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vert_spd = data["vr"] * 32
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ud = bool(data["dvr"])
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if ud:
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vert_spd = 0 - vert_spd
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turn_rate = data["tr"] * 15/62
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rl = data["str"]
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if rl:
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turn_rate = 0 - turn_rate
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ns_vel = data["vns"] - 1
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ns = bool(data["dns"])
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ew_vel = data["vew"] - 1
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ew = bool(data["dew"])
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velocity = math.hypot(ns_vel, ew_vel)
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if ew:
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ew_vel = 0 - ew_vel
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if ns:
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ns_vel = 0 - ns_vel
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heading = math.atan2(ew_vel, ns_vel) * (180.0 / math.pi)
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if heading < 0:
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heading += 360
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return [velocity, heading, vert_spd, turn_rate]
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def parseBDS09_1(self, data):
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#1: ["sub", "icf", "ifr", "nuc", "dew", "vew", "dns", "vns", "vrsrc", "dvr", "vr", "dhd", "hd"],
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alt_geo_diff = data["hd"] * 25
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above_below = bool(data["dhd"])
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if above_below:
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alt_geo_diff = 0 - alt_geo_diff;
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vert_spd = float(data["vr"] - 1) * 64
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ud = bool(data["dvr"])
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if ud:
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vert_spd = 0 - vert_spd
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vert_src = bool(data["vrsrc"])
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ns_vel = float(data["vns"])
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ns = bool(data["dns"])
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ew_vel = float(data["vew"])
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ew = bool(data["dew"])
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subtype = data["sub"]
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if subtype == 0x02:
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ns_vel <<= 2
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ew_vel <<= 2
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velocity = math.hypot(ns_vel, ew_vel)
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if ew:
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ew_vel = 0 - ew_vel
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if ns_vel == 0:
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heading = 0
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else:
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heading = math.atan(float(ew_vel) / float(ns_vel)) * (180.0 / math.pi)
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if ns:
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heading = 180 - heading
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if heading < 0:
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heading += 360
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return [velocity, heading, vert_spd]
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def parseBDS62(self, data):
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eps_strings = ["NO EMERGENCY", "GENERAL EMERGENCY", "LIFEGUARD/MEDICAL", "FUEL EMERGENCY",
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"NO COMMUNICATIONS", "UNLAWFUL INTERFERENCE", "RESERVED", "RESERVED"]
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return eps_strings[data["eps"]]
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def parseMB_id(self, data): #bds1 == 2, bds2 == 0
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msg = ""
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for i in range(0, 8):
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msg += self.charmap( data["ais"] >> (42-6*i) & 0x3F)
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return (msg)
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def parseMB_TCAS_resolutions(self, data):
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#these are LSB because the ICAO are asshats
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ara_bits = {41: "CLIMB", 42: "DON'T DESCEND", 43: "DON'T DESCEND >500FPM", 44: "DON'T DESCEND >1000FPM",
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45: "DON'T DESCEND >2000FPM", 46: "DESCEND", 47: "DON'T CLIMB", 48: "DON'T CLIMB >500FPM",
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49: "DON'T CLIMB >1000FPM", 50: "DON'T CLIMB >2000FPM", 51: "TURN LEFT", 52: "TURN RIGHT",
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53: "DON'T TURN LEFT", 54: "DON'T TURN RIGHT"}
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rac_bits = {55: "DON'T DESCEND", 56: "DON'T CLIMB", 57: "DON'T TURN LEFT", 58: "DON'T TURN RIGHT"}
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ara = data["ara"]
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#check to see which bits are set
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resolutions = ""
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for bit, name in ara_bits:
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if ara & (1 << (54-bit)):
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resolutions += " " + name
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complements = ""
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for bit, name in rac_bits:
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if rac & (1 << (58-bit)):
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complements += " " + name
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return (resolutions, complements)
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#rat is 1 if resolution advisory terminated <18s ago
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#mte is 1 if multiple threats indicated
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#tti is threat type: 1 if ID, 2 if range/brg/alt
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#tida is threat altitude in Mode C format
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def parseMB_TCAS_threatid(self, data): #bds1==3, bds2==0, TTI==1
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#3: {"bds1": (33,4), "bds2": (37,4), "ara": (41,14), "rac": (55,4), "rat": (59,1),
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# "mte": (60,1), "tti": (61,2), "tida": (63,13), "tidr": (76,7), "tidb": (83,6)}
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(resolutions, complements) = self.parseMB_TCAS_resolutions(data)
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return (resolutions, complements, data["rat"], data["mte"], data["tid"])
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def parseMB_TCAS_threatloc(self, data): #bds1==3, bds2==0, TTI==2
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(resolutions, complements) = self.parseMB_TCAS_resolutions(data)
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threat_alt = decode_alt(data["tida"], True)
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return (resolutions, complements, data["rat"], data["mte"], threat_alt, data["tidr"], data["tidb"])
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