# # Copyright 2010, 2012 Nick Foster # # This file is part of gr-air-modes # # gr-air-modes is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3, or (at your option) # any later version. # # gr-air-modes is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with gr-air-modes; see the file COPYING. If not, write to # the Free Software Foundation, Inc., 51 Franklin Street, # Boston, MA 02110-1301, USA. # import time, os, sys from string import split, join from altitude import decode_alt import cpr import math from modes_exceptions import * class modes_parse: def __init__(self, mypos): self.my_location = mypos self.cpr = cpr.cpr_decoder(self.my_location) def parse0(self, shortdata): vs = bool(shortdata >> 26 & 0x1) #ground sensor -- airborne when 0 cc = bool(shortdata >> 25 & 0x1) #crosslink capability, binary sl = shortdata >> 21 & 0x07 #operating sensitivity of onboard TCAS system. 0 means no TCAS sensitivity reported, 1-7 give TCAS sensitivity 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, #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 altitude = decode_alt(shortdata & 0x1FFF, True) #bit 13 is set for type 0 return [vs, cc, sl, ri, altitude] def parse4(self, shortdata): 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 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, #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 um = shortdata >> 13 & 0x3F #transponder status readouts, no decoding information available altitude = decode_alt(shortdata & 0x1FFF, True) return [fs, dr, um, altitude] def parse5(self, shortdata): 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 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, #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 um = shortdata >> 13 & 0x3F #transponder status readouts, no decoding information available return [fs, dr, um] def parse11(self, shortdata, ecc): interrogator = ecc & 0x0F ca = shortdata >> 13 & 0x3F #capability icao24 = shortdata & 0xFFFFFF return [icao24, interrogator, ca] #the Type 17 subtypes are: #0: No position information #1: Identification (Category set D) #2: Identification (Category set C) #3: "" (B) #4: "" (A) #5: Surface position accurate to 7.5m #6: "" to 25m #7: "" to 185.2m (0.1nm) #8: "" above 185.2m #9: Airborne position to 7.5m #10-18: Same with less accuracy #19: Airborne velocity #20: Airborne position w/GNSS height above earth #21: same to 25m #22: same above 25m #23: Reserved #24: Reserved for surface system status #25-27: Reserved #28: Extended squitter aircraft status #29: Current/next trajectory change point #30: Aircraft operational coordination #31: Aircraft operational status categories = [["NO INFO", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED", "RESERVED"],\ ["NO INFO", "SURFACE EMERGENCY VEHICLE", "SURFACE SERVICE VEHICLE", "FIXED OBSTRUCTION", "RESERVED", "RESERVED", "RESERVED"],\ ["NO INFO", "GLIDER", "BALLOON/BLIMP", "PARACHUTE", "ULTRALIGHT", "RESERVED", "UAV", "SPACECRAFT"],\ ["NO INFO", "LIGHT", "SMALL", "LARGE", "LARGE HIGH VORTEX", "HEAVY", "HIGH PERFORMANCE", "ROTORCRAFT"]] def parseBDS08(self, shortdata, longdata): icao24 = shortdata & 0xFFFFFF subtype = (longdata >> 51) & 0x1F category = (longdata >> 48) & 0x07 catstring = self.categories[subtype-1][category] msg = "" for i in range(0, 8): msg += self.charmap( longdata >> (42-6*i) & 0x3F) return (msg, catstring) def charmap(self, d): if d > 0 and d < 27: retval = chr(ord("A")+d-1) elif d == 32: retval = " " elif d > 47 and d < 58: retval = chr(ord("0")+d-48) else: retval = " " return retval def parseBDS05(self, shortdata, longdata): icao24 = shortdata & 0xFFFFFF encoded_lon = longdata & 0x1FFFF encoded_lat = (longdata >> 17) & 0x1FFFF cpr_format = (longdata >> 34) & 1 enc_alt = (longdata >> 36) & 0x0FFF altitude = decode_alt(enc_alt, False) [decoded_lat, decoded_lon, rnge, bearing] = self.cpr.decode(icao24, encoded_lat, encoded_lon, cpr_format, 0) return [altitude, decoded_lat, decoded_lon, rnge, bearing] #welp turns out it looks like there's only 17 bits in the BDS0,6 ground packet after all. def parseBDS06(self, shortdata, longdata): icao24 = shortdata & 0xFFFFFF encoded_lon = longdata & 0x1FFFF encoded_lat = (longdata >> 17) & 0x1FFFF cpr_format = (longdata >> 34) & 1 altitude = 0 [decoded_lat, decoded_lon, rnge, bearing] = self.cpr.decode(icao24, encoded_lat, encoded_lon, cpr_format, 1) return [altitude, decoded_lat, decoded_lon, rnge, bearing] def parseBDS09_0(self, shortdata, longdata): icao24 = shortdata & 0xFFFFFF vert_spd = ((longdata >> 6) & 0x1FF) * 32 ud = bool((longdata >> 15) & 1) if ud: vert_spd = 0 - vert_spd turn_rate = (longdata >> 16) & 0x3F turn_rate = turn_rate * 15/62 rl = bool((longdata >> 22) & 1) if rl: turn_rate = 0 - turn_rate ns_vel = (longdata >> 23) & 0x7FF - 1 ns = bool((longdata >> 34) & 1) ew_vel = (longdata >> 35) & 0x7FF - 1 ew = bool((longdata >> 46) & 1) subtype = (longdata >> 48) & 0x07 velocity = math.hypot(ns_vel, ew_vel) if ew: ew_vel = 0 - ew_vel if ns: ns_vel = 0 - ns_vel heading = math.atan2(ew_vel, ns_vel) * (180.0 / math.pi) if heading < 0: heading += 360 return [velocity, heading, vert_spd, turn_rate] def parseBDS09_1(self, shortdata, longdata): icao24 = shortdata & 0xFFFFFF alt_geo_diff = longdata & 0x7F - 1 above_below = bool((longdata >> 7) & 1) if above_below: alt_geo_diff = 0 - alt_geo_diff; vert_spd = float((longdata >> 10) & 0x1FF - 1) ud = bool((longdata >> 19) & 1) if ud: vert_spd = 0 - vert_spd vert_src = bool((longdata >> 20) & 1) ns_vel = float((longdata >> 21) & 0x3FF - 1) ns = bool((longdata >> 31) & 1) ew_vel = float((longdata >> 32) & 0x3FF - 1) ew = bool((longdata >> 42) & 1) subtype = (longdata >> 48) & 0x07 if subtype == 0x02: ns_vel *= 4 ew_vel *= 4 vert_spd *= 64 alt_geo_diff *= 25 velocity = math.hypot(ns_vel, ew_vel) if ew: ew_vel = 0 - ew_vel if ns_vel == 0: heading = 0 else: heading = math.atan(float(ew_vel) / float(ns_vel)) * (180.0 / math.pi) if ns: heading = 180 - heading if heading < 0: heading += 360 return [velocity, heading, vert_spd]