def read_message(self, msg, ts):
"""
Process ADSB messages
"""
if len(msg) < 28:
return
df = decoder.get_df(msg)
if df == 17:
addr = decoder.get_icao_addr(msg)
tc = decoder.get_tc(msg)
if tc >= 1 and tc <= 4:
# aircraft identification
callsign = decoder.get_callsign(msg)
self.update_callsign(addr, callsign)
if tc >= 9 and tc <= 18:
# airbone postion frame
alt = decoder.get_alt(msg)
oe = decoder.get_oe_flag(msg) # odd or even frame
cprlat = decoder.get_cprlat(msg)
cprlon = decoder.get_cprlon(msg)
self.update_cprpos(addr, oe, ts, alt, cprlat, cprlon)
elif tc == 19: # airbone velocity frame
sh = decoder.get_speed_heading(msg)
if len(sh) == 2:
spd = sh[0]
hdg = sh[1]
self.update_spd_hdg(addr, spd, hdg)
return
def read_message(self, msg, ts):
"""
Process ADSB messages
"""
if len(msg) < 28:
return
df = decoder.get_df(msg)
if df == 17:
addr = decoder.get_icao_addr(msg)
tc = decoder.get_tc(msg)
if tc >= 1 and tc <= 4:
# aircraft identification
callsign = decoder.get_callsign(msg)
self.update_callsign(addr, callsign)
if tc >= 9 and tc <= 18:
# airbone postion frame
alt = decoder.get_alt(msg)
oe = decoder.get_oe_flag(msg) # odd or even frame
cprlat = decoder.get_cprlat(msg)
cprlon = decoder.get_cprlon(msg)
self.update_cprpos(addr, oe, ts, alt, cprlat, cprlon)
elif tc == 19: # airbone velocity frame
sh = decoder.get_speed_heading(msg)
if len(sh) == 2:
spd = sh[0]
hdg = sh[1]
self.update_spd_hdg(addr, spd, hdg)
return
def read_message(self, msgtype, data, datalen):
''' Process the message that received from remote TCP server '''
if msgtype == 3:
# get time from the Aircraft
t_sec_ac = 0
t_sec_ac |= data[0] << 24
t_sec_ac |= data[1] << 16
t_sec_ac |= data[2] << 8
t_sec_ac |= data[3]
# get receiver timestamp
t_sec_receiver = 0
t_sec_receiver |= data[4] << 24
t_sec_receiver |= data[5] << 16
t_sec_receiver |= data[6] << 8
t_sec_receiver |= data[7]
# ignor receiver id, data[8]
# ignor data[9], for now
mlat = 0
mlat |= data[10] << 24
mlat |= data[11] << 16
mlat |= data[12] << 8
mlat |= data[13]
power = 0
power |= data[14] << 8
power |= data[15]
power &= 0x3FFF
power = power >> 6
# process msg in the data frame
msg = ''
msglen = 14 # type 3 data length is 14
msgstart = 16
msgend = msgstart + msglen
for i in data[msgstart : msgend] :
msg += "%02X" % i
# print "Type:%d | Len:%d | AcTime:%d | ReceiverTime:%d | Power:%d | MSG: %s" % \
# (msgtype, datalen, t_sec_ac, t_sec_receiver, power, msg)
df = adsb_decoder.get_df(msg)
tc = adsb_decoder.get_tc(msg)
ca = adsb_decoder.get_ca(msg)
if df == 17:
addr = adsb_decoder.get_icao_addr(msg)
if tc>=1 and tc<=4: # aircraft identification
callsign = adsb_decoder.get_callsign(msg)
self.datafeed.update_callsign_data(addr, callsign)
if tc>=9 and tc<=18: # airbone postion frame
alt = adsb_decoder.get_alt(msg)
oe = adsb_decoder.get_oe_flag(msg) # odd or even frame
cprlat = adsb_decoder.get_cprlat(msg)
cprlon = adsb_decoder.get_cprlon(msg)
dataset = {'addr':addr, 'oe':oe, 'time':t_sec_ac, 'alt':alt,
'cprlat':cprlat, 'cprlon':cprlon}
# print dataset
self.datafeed.push_cprpos_data(dataset)
elif tc==19: # airbone velocity frame
sh = adsb_decoder.get_speed_heading(msg)
if sh:
dataset = {'addr':addr, 'speed':sh[0], 'heading':sh[1]}
self.datafeed.push_speed_heading_data(dataset)
return
def decode_adsb(fs_msg):
"""
decode message
@param fs_msg: message to decode
"""
# logger
# M_LOG.info(">> decode_adsb")
# invalid message ?
if not (fs_msg.startswith('*') and fs_msg.endswith(';')):
# logger
M_LOG.warning("decode_adsb:<E01: invalid message [{}]".format(fs_msg))
# return
return
# obtém a mensagem em hexadecimal
ls_hex_message = fs_msg[1:-2]
M_LOG.debug("ls_hex_message: {}".format(ls_hex_message))
#if not dcdr.checksum(ls_hex_message):
#M_LOG.debug("decode_adsb:Erro de checksum !!!")
#return
# calcula o tamanho da mensagem em binário
ln_bits = 4 * len(ls_hex_message)
# obtém a mensagem em binário
ls_bin_message = bin(int(ls_hex_message, 16))[2:].zfill(ln_bits)
# downlink format
li_df = int(ls_bin_message[0:5], 2)
# mensagem ADS-B tratável ?
if li_df not in [ 17 ]:
# logger
M_LOG.warning("decode_adsb:<E02: tipo de mensagem não tratada.")
# return
return
# message subtype / capability (3 bits) (get_cap)
li_cap = int(ls_bin_message[5:8], 2)
# ICAO aircraft address (get_icao_addr)
ls_icao_addr = ls_hex_message[2:8]
# CRC (error check)
ls_crc = ls_hex_message[-6:]
M_LOG.debug("ls_crc: {}".format(ls_crc))
# extended squitter type (get_tc)
li_type_code = int(ls_bin_message[32:37], 2)
try:
# aircraft identification
if li_type_code in xrange(1, 5):
M_LOG.debug("aircraft identification")
# aircraft category (3 bits)
li_type = int(ls_bin_message[38:40], 2)
M_LOG.debug("li_type: {}".format(li_type))
# atualiza o callsign na aeronave
s_callsign = dcdr.get_callsign(ls_bin_message)
# surface position
elif li_type_code in xrange(5, 9):
M_LOG.debug("surface position")
pass
# airborne position
elif li_type_code in xrange(9, 19):
M_LOG.debug("airborne position (Baro Alt)")
# surveillance status (2 bits)
#
# - 0 no emergency or other Mode 3/A code information
# - 1 permanent alert (emergency code)
# - 2 temporary alert (change of Mode 3/A code other than emergency)
# - 3 special position indicator (SPI) condition
sv_status = int(ls_bin_message[37:39], 2)
M_LOG.debug("sv_status: {}".format(sv_status))
# altitude (12 bits) (get_alt)
altitude = dcdr.get_alt(ls_bin_message)
M_LOG.debug("altitude: {}".format(altitude))
# CPR odd/even flag (1 bit) (get_oe_flag)
cpr_format_flag = int(ls_bin_message[53])
if 1 == cpr_format_flag:
if (ls_icao_addr in dct_cpr) and (dct_cpr[ls_icao_addr] is not None):
lat, lng = dcdr.cpr2position(dcdr.get_cprlat(dct_cpr[ls_icao_addr]),
dcdr.get_cprlat(ls_bin_message),
dcdr.get_cprlng(dct_cpr[ls_icao_addr]),
dcdr.get_cprlng(ls_bin_message), 0, 1)
M_LOG.debug(">>>>>>>>>>>>>> lat, lng: {}".format((lat, lng)))
dct_cpr[ls_icao_addr] = None
elif 0 == cpr_format_flag:
dct_cpr[ls_icao_addr] = ls_bin_message
# airborne velocities ?
elif 19 == li_type_code:
M_LOG.debug("airborne velocities")
# extended squitter subtype
es_subtype = int(ls_bin_message[38:40], 2)
M_LOG.debug("es_subtype: {}".format(es_subtype))
# obtém a velocidade e a proa
l_vel, l_proa = dcdr.get_speed_heading(ls_bin_message)
M_LOG.debug("speed, heading: {}".format((l_vel, l_proa)))
# turn indicator (2-bit)
turn_indicator = int(ls_bin_message[78:79], 2)
M_LOG.debug("turn_indicator: {}".format(turn_indicator))
# airborne position (GNSS height) ?
elif li_type_code in xrange(20, 23):
M_LOG.debug("airborne position (GNSS height)")
pass
# test message ?
elif 23 == li_type_code:
M_LOG.debug("test message")
pass
# surface system status ?
elif 24 == li_type_code:
M_LOG.debug("surface system status")
pass
# reserved ?
elif li_type_code in xrange(25, 28):
M_LOG.debug("reserved")
pass
# extended squitter AC status ?
elif 28 == li_type_code:
M_LOG.debug("extended squitter AC status")
pass
# target state and status (V.2) ?
elif 29 == li_type_code:
M_LOG.debug("target state and status (V.2)")
pass
# reserved ?
elif 30 == li_type_code:
M_LOG.debug("reserved")
pass
# aircraft operation status ?
elif 31 == li_type_code:
M_LOG.debug("aircraft operation status")
pass
# senão,...
else:
# logger
l_log = logging.getLogger("CEmulaVisADSB::decode_adsb")
l_log.setLevel(logging.NOTSET)
l_log.warning("E01: mensagem não reconhecida ou não tratada.")
except: pass
