256 lines
8.6 KiB
Python
256 lines
8.6 KiB
Python
#
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# Copyright 2010 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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from cpr import cpr_decode
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import math
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class modes_parse:
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def __init__(self, mypos):
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self.my_location = mypos
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self.cpr_decoder = cpr_decoder(self.my_location)
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def parse0(self, shortdata, parity, ecc):
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# shortdata = long(shortdata, 16)
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#parity = long(parity)
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vs = bool(shortdata >> 26 & 0x1) #ground sensor -- airborne when 0
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cc = bool(shortdata >> 25 & 0x1) #crosslink capability, binary
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sl = shortdata >> 21 & 0x07 #operating sensitivity of onboard TCAS system. 0 means no TCAS sensitivity reported, 1-7 give TCAS sensitivity
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ri = shortdata >> 15 & 0x0F #speed coding: 0 = no onboard TCAS, 1 = NA, 2 = TCAS w/inhib res, 3 = TCAS w/vert only, 4 = TCAS w/vert+horiz, 5-7 = NA, 8 = no max A/S avail,
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#9 = A/S <= 75kt, 10 = A/S (75-150]kt, 11 = (150-300]kt, 12 = (300-600]kt, 13 = (600-1200]kt, 14 = >1200kt, 15 = NA
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altitude = decode_alt(shortdata & 0x1FFF, True) #bit 13 is set for type 0
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return [vs, cc, sl, ri, altitude]
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def parse4(self, shortdata, parity, ecc):
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# shortdata = long(shortdata, 16)
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fs = shortdata >> 24 & 0x07 #flight status: 0 is airborne normal, 1 is ground normal, 2 is airborne alert, 3 is ground alert, 4 is alert SPI, 5 is normal SPI
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dr = shortdata >> 19 & 0x1F #downlink request: 0 means no req, bit 0 is Comm-B msg rdy bit, bit 1 is TCAS info msg rdy, bit 2 is Comm-B bcast #1 msg rdy, bit2+bit0 is Comm-B bcast #2 msg rdy,
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#bit2+bit1 is TCAS info and Comm-B bcast #1 msg rdy, bit2+bit1+bit0 is TCAS info and Comm-B bcast #2 msg rdy, 8-15 N/A, 16-31 req to send N-15 segments
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um = shortdata >> 13 & 0x3F #transponder status readouts, no decoding information available
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altitude = decode_alt(shortdata & 0x1FFF, True)
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return [fs, dr, um, altitude]
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def parse5(self, shortdata, parity, ecc):
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# shortdata = long(shortdata, 16)
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fs = shortdata >> 24 & 0x07 #flight status: 0 is airborne normal, 1 is ground normal, 2 is airborne alert, 3 is ground alert, 4 is alert SPI, 5 is normal SPI
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dr = shortdata >> 19 & 0x1F #downlink request: 0 means no req, bit 0 is Comm-B msg rdy bit, bit 1 is TCAS info msg rdy, bit 2 is Comm-B bcast #1 msg rdy, bit2+bit0 is Comm-B bcast #2 msg rdy,
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#bit2+bit1 is TCAS info and Comm-B bcast #1 msg rdy, bit2+bit1+bit0 is TCAS info and Comm-B bcast #2 msg rdy, 8-15 N/A, 16-31 req to send N-15 segments
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um = shortdata >> 13 & 0x3F #transponder status readouts, no decoding information available
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return [fs, dr, um]
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def parse11(self, shortdata, parity, ecc):
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# shortdata = long(shortdata, 16)
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interrogator = ecc & 0x0F
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ca = shortdata >> 13 & 0x3F #capability
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icao24 = shortdata & 0xFFFFFF
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return [icao24, interrogator, ca]
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#def parse17(self, shortdata, longdata, parity, ecc):
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# shortdata = long(shortdata, 16)
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# longdata = long(longdata, 16)
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# parity = long(parity, 16)
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# ecc = long(ecc, 16)
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# subtype = (longdata >> 51) & 0x1F;
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#the subtypes are:
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#0: No position information
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#1: Identification (Category set D)
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#2: Identification (Category set C)
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#3: "" (B)
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#4: "" (A)
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#5: Surface position accurate to 7.5m
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#6: "" to 25m
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#7: "" to 185.2m (0.1nm)
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#8: "" above 185.2m
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#9: Airborne position to 7.5m
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#10-18: Same with less accuracy
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#19: Airborne velocity
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#20: Airborne position w/GNSS height above earth
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#21: same to 25m
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#22: same above 25m
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#23: Reserved
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#24: Reserved for surface system status
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#25-27: Reserved
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#28: Extended squitter aircraft status
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#29: Current/next trajectory change point
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#30: Aircraft operational coordination
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#31: Aircraft operational status
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# if subtype == 4:
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# retstr = parseBDS08(shortdata, longdata, parity, ecc)
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# elif subtype >= 9 and subtype <= 18:
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# retstr = parseBDS05(shortdata, longdata, parity, ecc)
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# elif subtype == 19:
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# subsubtype = (longdata >> 48) & 0x07
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# if subsubtype == 0:
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# retstr = parseBDS09_0(shortdata, longdata, parity, ecc)
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# elif subsubtype == 1:
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# retstr = parseBDS09_1(shortdata, longdata, parity, ecc)
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# else:
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# retstr = "BDS09 subtype " + str(subsubtype) + " not implemented"
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# else:
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# retstr = "Type 17, subtype " + str(subtype) + " not implemented"
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# return retstr
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def parseBDS08(self, shortdata, longdata, parity, ecc):
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icao24 = shortdata & 0xFFFFFF
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msg = ""
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for i in range(0, 8):
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msg += self.charmap( longdata >> (42-6*i) & 0x3F)
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#retstr = "Type 17 subtype 04 (ident) from " + "%x" % icao24 + " with data " + msg
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return msg
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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, shortdata, longdata, parity, ecc):
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icao24 = shortdata & 0xFFFFFF
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encoded_lon = longdata & 0x1FFFF
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encoded_lat = (longdata >> 17) & 0x1FFFF
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cpr_format = (longdata >> 34) & 1
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enc_alt = (longdata >> 36) & 0x0FFF
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altitude = decode_alt(enc_alt, False)
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[decoded_lat, decoded_lon, rnge, bearing] = cpr_decoder.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. fuck.
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def parseBDS06(self, shortdata, longdata, parity, ecc):
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icao24 = shortdata & 0xFFFFFF
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encoded_lon = longdata & 0x1FFFF
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encoded_lat = (longdata >> 17) & 0x1FFFF
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cpr_format = (longdata >> 34) & 1
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# enc_alt = (longdata >> 36) & 0x0FFF
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altitude = 0
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[decoded_lat, decoded_lon, rnge, bearing] = cpr_decoder.decode(icao24, encoded_lat, encoded_lon, cpr_format, 1)
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return [altitude, decoded_lat, decoded_lon, rnge, bearing]
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def parseBDS09_0(self, shortdata, longdata, parity, ecc):
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icao24 = shortdata & 0xFFFFFF
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vert_spd = ((longdata >> 6) & 0x1FF) * 32
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ud = bool((longdata >> 15) & 1)
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if ud:
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vert_spd = 0 - vert_spd
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turn_rate = (longdata >> 16) & 0x3F
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turn_rate = turn_rate * 15/62
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rl = bool((longdata >> 22) & 1)
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if rl:
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turn_rate = 0 - turn_rate
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ns_vel = (longdata >> 23) & 0x7FF - 1
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ns = bool((longdata >> 34) & 1)
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ew_vel = (longdata >> 35) & 0x7FF - 1
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ew = bool((longdata >> 46) & 1)
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subtype = (longdata >> 48) & 0x07
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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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#retstr = "Type 17 subtype 09-0 (track report) from " + "%x" % icao24 + " with velocity " + "%.0f" % velocity + "kt heading " + "%.0f" % heading + " VS " + "%.0f" % vert_spd
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return [velocity, heading, vert_spd]
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def parseBDS09_1(self, shortdata, longdata, parity, ecc):
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icao24 = shortdata & 0xFFFFFF
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alt_geo_diff = longdata & 0x7F - 1
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above_below = bool((longdata >> 7) & 1)
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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((longdata >> 10) & 0x1FF - 1)
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ud = bool((longdata >> 19) & 1)
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if ud:
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vert_spd = 0 - vert_spd
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vert_src = bool((longdata >> 20) & 1)
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ns_vel = float((longdata >> 21) & 0x3FF - 1)
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ns = bool((longdata >> 31) & 1)
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ew_vel = float((longdata >> 32) & 0x3FF - 1)
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ew = bool((longdata >> 42) & 1)
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subtype = (longdata >> 48) & 0x07
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if subtype == 0x02:
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ns_vel *= 4
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ew_vel *= 4
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vert_spd *= 64
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alt_geo_diff *= 25
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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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#retstr = "Type 17 subtype 09-1 (track report) from " + "%x" % icao24 + " with velocity " + "%.0f" % velocity + "kt heading " + "%.0f" % heading + " VS " + "%.0f" % vert_spd
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return [velocity, heading, vert_spd]
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