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Major upgrade. Rename to pyModeS. Added EHS decoding and testing modules.

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The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# A Python ADS-B Decoder
This is a python ADS-B message decoder written by Junzi Sun (TuDelft). It is related with the ADS-B decode guide we have published:
http://adsb-decode-guide.readthedocs.org
https://github.com/junzis/adsb-decode-guide

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A Python Mode-S Decoder
=======================
Python library for Mode-S message decoding. Two seprate methods are
develop to decode the following messages:
- Automatic Dependent Surveillance - Broadcast (ADS-B) (DF17)
- aircraft infomation that cotains: icao address, position,
altitude, velocity (ground speed), and callsign, etc.
- Mode-S Enhanced Surveillance (EHS) (DF20 and DF21)
- additional information in response to SSR interogation, such as:
true airspeed, indicated airspeed, mach number, track angle,
heading, and roll angle, etc.
A detailed manuel on Mode-S decoding is published by the author, at:
http://adsb-decode-guide.readthedocs.org
Source code
-----------
Checkourt and contribute to this open source project at:
https://github.com/junzis/pyModeS
Install
-------
Checkout source code, or install using pip:
::
pip install pyModeS
Usage
-----
.. code:: python
import pyModeS as pms
Core functions for ADS-B decoding:
.. code:: python
pms.adsb.icao(msg)
pms.adsb.callsign(msg)
pms.adsb.position(msg_odd, msg_even, t_odd, t_even)
pms.adsb.altitude(msg)
pms.adsb.velocity(msg)
pms.adsb.speed_heading(msg)
Core functions for EHS decoding:
.. code:: python
pms.ehs.icao(msg) # icao address
pms.ehs.BDS(msg) # Comm-B Data Selector Version
# for BDS version 2,0
pms.ehs.callsign(msg) # Aircraft callsign
# for BDS version 4,0
pms.ehs.alt_mcp(msg) # MCP/FCU selected altitude (ft)
pms.ehs.alt_fms(msg) # FMS selected altitude (ft)
pms.ehs.alt_pbaro(msg) # Barometric pressure (mb)
# for BDS version 5,0
pms.ehs.roll(msg) # roll angle (deg)
pms.ehs.track(msg) # track angle (deg)
pms.ehs.gs(msg) # ground speed (kt)
pms.ehs.rtrack(msg) # track angle rate (deg/sec)
pms.ehs.tas(msg) # true airspeed (kt)
# for BDS version 6,0
pms.ehs.heading(msg) # heading (deg)
pms.ehs.ias(msg) # indicated airspeed (kt)
pms.ehs.mach(msg) # MACH number
pms.ehs.baro_vr(msg) # barometric altitude rate (ft/min)
pms.ehs.ins_vr(msg) # inertial vertical speed (ft/min)
Some helper functions:
.. code:: python
pms.df(msg) # downlink format of a Mode-S message
pms.hex2bin(msg) # convert hexadecimal string to binary string
pms.hex2int(msg) # convert hexadecimal string to integer
pms.bin2int(msg) # convert binary string to integer

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"""
This is a decoder of ABS-D date from Mode-S receiver. The inputs
of most functions are the Hexdecial strings.
Created by : Junzi Sun (TU Delft)
Date : March 2015
"""
import math
MODES_CHECKSUM_TABLE = [
0x3935ea, 0x1c9af5, 0xf1b77e, 0x78dbbf,
0xc397db, 0x9e31e9, 0xb0e2f0, 0x587178,
0x2c38bc, 0x161c5e, 0x0b0e2f, 0xfa7d13,
0x82c48d, 0xbe9842, 0x5f4c21, 0xd05c14,
0x682e0a, 0x341705, 0xe5f186, 0x72f8c3,
0xc68665, 0x9cb936, 0x4e5c9b, 0xd8d449,
0x939020, 0x49c810, 0x24e408, 0x127204,
0x093902, 0x049c81, 0xfdb444, 0x7eda22,
0x3f6d11, 0xe04c8c, 0x702646, 0x381323,
0xe3f395, 0x8e03ce, 0x4701e7, 0xdc7af7,
0x91c77f, 0xb719bb, 0xa476d9, 0xadc168,
0x56e0b4, 0x2b705a, 0x15b82d, 0xf52612,
0x7a9309, 0xc2b380, 0x6159c0, 0x30ace0,
0x185670, 0x0c2b38, 0x06159c, 0x030ace,
0x018567, 0xff38b7, 0x80665f, 0xbfc92b,
0xa01e91, 0xaff54c, 0x57faa6, 0x2bfd53,
0xea04ad, 0x8af852, 0x457c29, 0xdd4410,
0x6ea208, 0x375104, 0x1ba882, 0x0dd441,
0xf91024, 0x7c8812, 0x3e4409, 0xe0d800,
0x706c00, 0x383600, 0x1c1b00, 0x0e0d80,
0x0706c0, 0x038360, 0x01c1b0, 0x00e0d8,
0x00706c, 0x003836, 0x001c1b, 0xfff409,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000
]
def hex2bin(hexstr):
"""Convert a hexdecimal string to binary string, with zero fillings. """
scale = 16
num_of_bits = len(hexstr) * math.log(scale, 2)
binstr = bin(int(hexstr, scale))[2:].zfill(int(num_of_bits))
return binstr
def bin2int(binstr):
return int(binstr, 2)
def hex2int(hexstr):
return int(hexstr, 16)
def checksum(msg):
if len(msg) == 28:
offset = 0
elif len(msg) == 14:
offset = 112-56
else:
# raise exception
return False
msgbin = hex2bin(msg)
checksum = int(msg[22:28], 16)
crc = 0
for i in xrange(len(msgbin)):
if int(msgbin[i]):
crc ^= MODES_CHECKSUM_TABLE[i+offset]
if crc == checksum:
return True
else:
return False
def get_df(msg):
"""Decode Downlink Format vaule, bits 1 to 5."""
msgbin = hex2bin(msg)
return bin2int(msgbin[0: 5])
def get_ca(msg):
"""Decode CA vaule, bits: 6 to 8."""
msgbin = hex2bin(msg)
return bin2int(msgbin[5:8])
def get_icao_addr(msg):
"""Get the ICAO 24 bits address, bytes 3 to 8. """
return msg[2:8]
def get_tc(msg):
"""Get Type Code, bits 33 to 37 """
msgbin = hex2bin(msg)
return bin2int(msgbin[32:37])
def get_nic(msg):
"""
Calculate NIC, navigation integrity category,
return -1 if not applicable
"""
msgbin = hex2bin(msg)
tc = get_tc(msg)
nic_sup_b = bin2int(msgbin[39])
if tc in [0, 18, 22]:
nic = 0
elif tc == 17:
nic = 1
elif tc == 16:
if nic_sup_b:
nic = 3
else:
nic = 2
elif tc == 15:
nic = 4
elif tc == 14:
nic = 5
elif tc == 13:
nic = 6
elif tc == 12:
nic = 7
elif tc == 11:
if nic_sup_b:
nic = 9
else:
nic = 8
elif tc in [10, 21]:
nic = 10
elif tc in [9, 20]:
nic = 11
else:
nic = -1
return nic
def get_oe_flag(msg):
"""Check the odd/even flag. Bit 54, 0 for even, 1 for odd."""
msgbin = hex2bin(msg)
return msgbin[53]
def get_alt(msg):
"""Calculate the altitude from the message. Bit 41 to 52, Q-bit at 48"""
msgbin = hex2bin(msg)
q = msgbin[47]
if q:
n = bin2int(msgbin[40:47]+msgbin[48:52])
alt = n * 25 - 1000
return alt
else:
return None
def get_cprlat(msg):
msgbin = hex2bin(msg)
return bin2int(msgbin[54:71])
def get_cprlon(msg):
msgbin = hex2bin(msg)
return bin2int(msgbin[71:88])
def get_position(msg0, msg1, t0, t1):
cprlat0 = get_cprlat(msg0)
cprlat1 = get_cprlat(msg1)
cprlon0 = get_cprlon(msg0)
cprlon1 = get_cprlon(msg1)
return cpr2position(cprlat0, cprlat1, cprlon0, cprlon1, t0, t1)
def cpr2position(cprlat0, cprlat1, cprlon0, cprlon1, t0, t1):
'''
This algorithm comes from:
http://www.lll.lu/~edward/edward/adsb/DecodingADSBposition.html.
131072 is 2^17 since CPR latitude and longitude are encoded in 17 bits.
'''
cprlat_even = cprlat0 / 131072.0
cprlat_odd = cprlat1 / 131072.0
cprlon_even = cprlon0 / 131072.0
cprlon_odd = cprlon1 / 131072.0
air_d_lat_even = 360.0 / 60
air_d_lat_odd = 360.0 / 59
# compute latitude index 'j'
j = int(math.floor(59 * cprlat_even - 60 * cprlat_odd + 0.5))
lat_even = float(air_d_lat_even * (j % 60 + cprlat_even))
lat_odd = float(air_d_lat_odd * (j % 59 + cprlat_odd))
if lat_even >= 270:
lat_even = lat_even - 360
if lat_odd >= 270:
lat_odd = lat_odd - 360
# check if both are in the same latidude zone, exit if not
if cprNL(lat_even) != cprNL(lat_odd):
return None
# compute ni, longitude index m, and longitude
if (t0 > t1):
ni = cprN(lat_even, 0)
m = math.floor(cprlon_even * (cprNL(lat_even)-1) -
cprlon_odd * cprNL(lat_even) + 0.5)
lon = (360.0 / ni) * (m % ni + cprlon_even)
lat = lat_even
else:
ni = cprN(lat_odd, 1)
m = math.floor(cprlon_even * (cprNL(lat_odd)-1) -
cprlon_odd * cprNL(lat_odd) + 0.5)
lon = (360.0 / ni) * (m % ni + cprlon_odd)
lat = lat_odd
if lon > 180:
lon = lon - 360
return lat, lon
def get_velocity(msg):
"""Calculate the speed, heading, and vertical rate"""
msgbin = hex2bin(msg)
subtype = bin2int(msgbin[37:40])
if subtype in (1, 2):
v_ew_sign = bin2int(msgbin[45])
v_ew = bin2int(msgbin[46:56]) - 1 # east-west velocity
v_ns_sign = bin2int(msgbin[56])
v_ns = bin2int(msgbin[57:67]) - 1 # north-south velocity
v_we = -1*v_ew if v_ew_sign else v_ew
v_sn = -1*v_ns if v_ns_sign else v_ns
spd = math.sqrt(v_sn*v_sn + v_we*v_we) # unit in kts
hdg = math.atan2(v_we, v_sn)
hdg = math.degrees(hdg) # convert to degrees
hdg = hdg if hdg >= 0 else hdg + 360 # no negative val
tag = 'GS'
else:
hdg = bin2int(msgbin[46:56]) / 1024.0 * 360.0
spd = bin2int(msgbin[57:67])
tag = 'AS'
vr_sign = bin2int(msgbin[68])
vr = bin2int(msgbin[68:77]) # vertical rate
rocd = -1*vr if vr_sign else vr # rate of climb/descend
return int(spd), hdg, int(rocd), tag
def get_speed_heading(msg):
"""Calculate the speed and heading."""
spd, hdg, rocd, tag = get_velocity(msg)
return spd, hdg
def get_callsign(msg):
"""Decode aircraft identification, aka. Callsign"""
chars = '#ABCDEFGHIJKLMNOPQRSTUVWXYZ#####_###############0123456789######'
msgbin = hex2bin(msg)
csbin = msgbin[40:96]
cs = ''
cs += chars[bin2int(csbin[0:6])]
cs += chars[bin2int(csbin[6:12])]
cs += chars[bin2int(csbin[12:18])]
cs += chars[bin2int(csbin[18:24])]
cs += chars[bin2int(csbin[24:30])]
cs += chars[bin2int(csbin[30:36])]
cs += chars[bin2int(csbin[36:42])]
cs += chars[bin2int(csbin[42:48])]
# clean string, remove spaces and marks, if any.
# cs = cs.replace('_', '')
cs = cs.replace('#', '')
return cs
def cprN(lat, is_odd):
nl = cprNL(lat) - is_odd
return nl if nl > 1 else 1
def cprNL(lat):
try:
nz = 60
a = 1 - math.cos(math.pi * 2 / nz)
b = math.cos(math.pi / 180.0 * abs(lat)) ** 2
nl = 2 * math.pi / (math.acos(1 - a/b))
return int(nl)
except:
# happens when latitude is +/-90 degree
return 1
def cprNL_lookup(lat):
"""
Lookup table to convert the latitude to index.
Slightly faster than calculation.
"""
if lat < 0 : lat = -lat # Table is simmetric about the equator.
if lat < 10.47047130 : return 59
if lat < 14.82817437 : return 58
if lat < 18.18626357 : return 57
if lat < 21.02939493 : return 56
if lat < 23.54504487 : return 55
if lat < 25.82924707 : return 54
if lat < 27.93898710 : return 53
if lat < 29.91135686 : return 52
if lat < 31.77209708 : return 51
if lat < 33.53993436 : return 50
if lat < 35.22899598 : return 49
if lat < 36.85025108 : return 48
if lat < 38.41241892 : return 47
if lat < 39.92256684 : return 46
if lat < 41.38651832 : return 45
if lat < 42.80914012 : return 44
if lat < 44.19454951 : return 43
if lat < 45.54626723 : return 42
if lat < 46.86733252 : return 41
if lat < 48.16039128 : return 40
if lat < 49.42776439 : return 39
if lat < 50.67150166 : return 38
if lat < 51.89342469 : return 37
if lat < 53.09516153 : return 36
if lat < 54.27817472 : return 35
if lat < 55.44378444 : return 34
if lat < 56.59318756 : return 33
if lat < 57.72747354 : return 32
if lat < 58.84763776 : return 31
if lat < 59.95459277 : return 30
if lat < 61.04917774 : return 29
if lat < 62.13216659 : return 28
if lat < 63.20427479 : return 27
if lat < 64.26616523 : return 26
if lat < 65.31845310 : return 25
if lat < 66.36171008 : return 24
if lat < 67.39646774 : return 23
if lat < 68.42322022 : return 22
if lat < 69.44242631 : return 21
if lat < 70.45451075 : return 20
if lat < 71.45986473 : return 19
if lat < 72.45884545 : return 18
if lat < 73.45177442 : return 17
if lat < 74.43893416 : return 16
if lat < 75.42056257 : return 15
if lat < 76.39684391 : return 14
if lat < 77.36789461 : return 13
if lat < 78.33374083 : return 12
if lat < 79.29428225 : return 11
if lat < 80.24923213 : return 10
if lat < 81.19801349 : return 9
if lat < 82.13956981 : return 8
if lat < 83.07199445 : return 7
if lat < 83.99173563 : return 6
if lat < 84.89166191 : return 5
if lat < 85.75541621 : return 4
if lat < 86.53536998 : return 3
if lat < 87.00000000 : return 2
else : return 1

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from util import hex2bin, bin2int, hex2int, df
import adsb
import ehs

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"""
A python package for decoding ABS-D messages.
Copyright (C) 2015 Junzi Sun (TU Delft)
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""
import math
import util
def checksum(msg):
"""CRC check the ADS-B message
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
bool: Checksum passed or not
"""
if len(msg) == 28:
offset = 0
elif len(msg) == 14:
offset = 112-56
else:
# raise exception
return False
msgbin = util.hex2bin(msg)
checksum = int(msg[22:28], 16)
crc = 0
for i in xrange(len(msgbin)):
# print msgbin[i]
if int(msgbin[i]):
crc ^= util.MODES_CHECKSUM_TABLE[i+offset]
if crc == checksum:
return True
else:
return False
def df(msg):
"""Get the downlink format (DF) number
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: DF number
"""
return util.df(msg)
def icao(msg):
"""Get the ICAO 24 bits address, bytes 3 to 8.
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
String: ICAO address in 6 bytes hexadecimal string
"""
return msg[2:8]
def data(msg):
"""Return the data frame in the message, bytes 9 to 22"""
return msg[8:22]
def typecode(msg):
"""Type code of ADS-B message
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: type code number
"""
msgbin = util.hex2bin(msg)
return util.bin2int(msgbin[32:37])
# ---------------------------------------------
# Aircraft Identification
# ---------------------------------------------
def category(msg):
"""Aircraft category number
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: category number
"""
if typecode(msg) < 1 or typecode(msg) > 4:
raise RuntimeError("%s: Not a identification message" % msg)
msgbin = util.hex2bin(msg)
return util.bin2int(msgbin[5:8])
def callsign(msg):
"""Aircraft callsign
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
string: callsign
"""
if typecode(msg) < 1 or typecode(msg) > 4:
raise RuntimeError("%s: Not a identification message" % msg)
chars = '#ABCDEFGHIJKLMNOPQRSTUVWXYZ#####_###############0123456789######'
msgbin = util.hex2bin(msg)
csbin = msgbin[40:96]
cs = ''
cs += chars[util.bin2int(csbin[0:6])]
cs += chars[util.bin2int(csbin[6:12])]
cs += chars[util.bin2int(csbin[12:18])]
cs += chars[util.bin2int(csbin[18:24])]
cs += chars[util.bin2int(csbin[24:30])]
cs += chars[util.bin2int(csbin[30:36])]
cs += chars[util.bin2int(csbin[36:42])]
cs += chars[util.bin2int(csbin[42:48])]
# clean string, remove spaces and marks, if any.
# cs = cs.replace('_', '')
cs = cs.replace('#', '')
return cs
# ---------------------------------------------
# Positions
# ---------------------------------------------
def oe_flag(msg):
"""Check the odd/even flag. Bit 54, 0 for even, 1 for odd.
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: 0 or 1, for even or odd frame
"""
if typecode(msg) < 5 or typecode(msg) > 18:
raise RuntimeError("%s: Not a position message" % msg)
msgbin = util.hex2bin(msg)
return int(msgbin[53])
def cprlat(msg):
"""CPR encoded latitude
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: encoded latitude
"""
if typecode(msg) < 5 or typecode(msg) > 18:
raise RuntimeError("%s: Not a position message" % msg)
msgbin = util.hex2bin(msg)
return util.bin2int(msgbin[54:71])
def cprlon(msg):
"""CPR encoded longitude
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: encoded longitude
"""
if typecode(msg) < 5 or typecode(msg) > 18:
raise RuntimeError("%s: Not a position message" % msg)
msgbin = util.hex2bin(msg)
return util.bin2int(msgbin[71:88])
def position(msg0, msg1, t0, t1):
"""Decode position from the combination of even and odd position message
131072 is 2^17, since CPR lat and lon are 17 bits each.
Args:
msg0 (string): even message (28 bytes hexadecimal string)
msg1 (string): odd message (28 bytes hexadecimal string)
t0 (int): timestamps for the even message
t1 (int): timestamps for the odd message
Returns:
(float, float): (latitude, longitude) of the aircraft
"""
if typecode(msg0) < 5 or typecode(msg0) > 18:
raise RuntimeError("%s: Not a position message" % msg0)
if typecode(msg1) < 5 or typecode(msg1) > 18:
raise RuntimeError("%s: Not a position message" % msg1)
msgbin0 = util.hex2bin(msg0)
msgbin1 = util.hex2bin(msg1)
cprlat_even = util.bin2int(msgbin0[54:71]) / 131072.0
cprlon_even = util.bin2int(msgbin0[71:88]) / 131072.0
cprlat_odd = util.bin2int(msgbin1[54:71]) / 131072.0
cprlon_odd = util.bin2int(msgbin1[71:88]) / 131072.0
air_d_lat_even = 360.0 / 60
air_d_lat_odd = 360.0 / 59
# compute latitude index 'j'
j = int(math.floor(59 * cprlat_even - 60 * cprlat_odd + 0.5))
lat_even = float(air_d_lat_even * (j % 60 + cprlat_even))
lat_odd = float(air_d_lat_odd * (j % 59 + cprlat_odd))
if lat_even >= 270:
lat_even = lat_even - 360
if lat_odd >= 270:
lat_odd = lat_odd - 360
# check if both are in the same latidude zone, exit if not
if _cprNL(lat_even) != _cprNL(lat_odd):
return None
# compute ni, longitude index m, and longitude
if (t0 > t1):
ni = _cprN(lat_even, 0)
m = math.floor(cprlon_even * (_cprNL(lat_even)-1) -
cprlon_odd * _cprNL(lat_even) + 0.5)
lon = (360.0 / ni) * (m % ni + cprlon_even)
lat = lat_even
else:
ni = _cprN(lat_odd, 1)
m = math.floor(cprlon_even * (_cprNL(lat_odd)-1) -
cprlon_odd * _cprNL(lat_odd) + 0.5)
lon = (360.0 / ni) * (m % ni + cprlon_odd)
lat = lat_odd
if lon > 180:
lon = lon - 360
return round(lat, 5), round(lon, 5)
def _cprN(lat, is_odd):
nl = _cprNL(lat) - is_odd
return nl if nl > 1 else 1
def _cprNL(lat):
try:
nz = 60
a = 1 - math.cos(math.pi * 2 / nz)
b = math.cos(math.pi / 180.0 * abs(lat)) ** 2
nl = 2 * math.pi / (math.acos(1 - a/b))
return int(nl)
except:
# happens when latitude is +/-90 degree
return 1
def altitude(msg):
"""Decode aircraft altitude
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: altitude in feet
"""
if typecode(msg) < 9 or typecode(msg) > 18:
raise RuntimeError("%s: Not a position message" % msg)
msgbin = util.hex2bin(msg)
q = msgbin[47]
if q:
n = util.bin2int(msgbin[40:47]+msgbin[48:52])
alt = n * 25 - 1000
return alt
else:
return None
def nic(msg):
"""Calculate NIC, navigation integrity category
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
int: NIC number (from 0 to 11), -1 if not applicable
"""
if typecode(msg) < 9 or typecode(msg) > 18:
raise RuntimeError("%s: Not a airborne position message" % msg)
msgbin = util.hex2bin(msg)
tc = typecode(msg)
nic_sup_b = util.bin2int(msgbin[39])
if tc in [0, 18, 22]:
nic = 0
elif tc == 17:
nic = 1
elif tc == 16:
if nic_sup_b:
nic = 3
else:
nic = 2
elif tc == 15:
nic = 4
elif tc == 14:
nic = 5
elif tc == 13:
nic = 6
elif tc == 12:
nic = 7
elif tc == 11:
if nic_sup_b:
nic = 9
else:
nic = 8
elif tc in [10, 21]:
nic = 10
elif tc in [9, 20]:
nic = 11
else:
nic = -1
return nic
# ---------------------------------------------
# Velocity
# ---------------------------------------------
def velocity(msg):
"""Calculate the speed, heading, and vertical rate
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
(int, float, int, string): speed (kt), heading (degree),
rate of climb/descend (ft/min), and speed type
('GS' for ground speed, 'AS' for airspeed)
"""
if typecode(msg) != 19:
raise RuntimeError("%s: Not a airborne velocity message" % msg)
msgbin = util.hex2bin(msg)
subtype = util.bin2int(msgbin[37:40])
if subtype in (1, 2):
v_ew_sign = util.bin2int(msgbin[45])
v_ew = util.bin2int(msgbin[46:56]) - 1 # east-west velocity
v_ns_sign = util.bin2int(msgbin[56])
v_ns = util.bin2int(msgbin[57:67]) - 1 # north-south velocity
v_we = -1*v_ew if v_ew_sign else v_ew
v_sn = -1*v_ns if v_ns_sign else v_ns
spd = math.sqrt(v_sn*v_sn + v_we*v_we) # unit in kts
hdg = math.atan2(v_we, v_sn)
hdg = math.degrees(hdg) # convert to degrees
hdg = hdg if hdg >= 0 else hdg + 360 # no negative val
tag = 'GS'
else:
hdg = util.bin2int(msgbin[46:56]) / 1024.0 * 360.0
spd = util.bin2int(msgbin[57:67])
tag = 'AS'
vr_sign = util.bin2int(msgbin[68])
vr = util.bin2int(msgbin[68:77]) # vertical rate
rocd = -1*vr if vr_sign else vr # rate of climb/descend
return int(spd), round(hdg, 1), int(rocd), tag
def speed_heading(msg):
"""Get speed and heading only from the velocity message
Args:
msg (string): 28 bytes hexadecimal message string
Returns:
(int, float): speed (kt), heading (degree)
"""
spd, hdg, rocd, tag = velocity(msg)
return spd, hdg

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"""
A python package for decoding ModeS (DF20, DF21) messages.
Copyright (C) 2016 Junzi Sun (TU Delft)
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""
import util
def crc(msg):
"""Calculate the cyclic redundancy checksum of an message
Args:
msg (String): 28 or 14 bytes hexadecimal message string
Returns:
int: checksum in integer
"""
if len(msg) == 28:
offset = 0
elif len(msg) == 14:
offset = 112-56
else:
raise RuntimeError("wrong message length, need to be 28 or 14 bytes")
msgbin = util.hex2bin(msg)
crc = 0
for i in xrange(len(msgbin)):
if int(msgbin[i]):
crc ^= util.MODES_CHECKSUM_TABLE[i+offset]
return crc
def df(msg):
"""Get the downlink format (DF) number
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
int: DF number
"""
return util.df(msg)
def data(msg):
"""Return the data frame in the message, bytes 9 to 22"""
return msg[8:22]
def icao(msg):
"""Calculate the ICAO address from an Mode-S message
with DF4, DF5, DF20, DF21
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
String: ICAO address in 6 bytes hexadecimal string
"""
if df(msg) not in (4, 5, 20, 21):
# raise RuntimeError("Message DF must be in (4, 5, 20, 21)")
return None
c0 = crc(msg)
c1 = util.hex2int(msg[-6:])
icao = '%06X' % (c0 ^ c1)
return icao
def checkbits(data, sb, msb, lsb):
"""Check if the status bit and field bits are consistency. This Function
is used for checking BDS code versions.
"""
# status bit, most significant bit, least significant bit
status = int(data[sb-1])
value = util.bin2int(data[msb-1:lsb])
if not status:
if value != 0:
return False
return True
# ------------------------------------------
# DF 20/21, BDS 2,0
# ------------------------------------------
def isBDS20(msg):
"""Check if a message is likely to be BDS code 2,0
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
bool: True or False
"""
# status bit 1, 14, and 27
d = util.hex2bin(data(msg))
result = True
if util.bin2int(d[0:4]) != 2 or util.bin2int(d[4:8]) != 0:
result &= False
cs = callsign(msg)
if '#' in cs:
result &= False
return result
def callsign(msg):
"""Aircraft callsign
Args:
msg (String): 28 bytes hexadecimal message (BDS40) string
Returns:
string: callsign, max. 8 chars
"""
chars = '#ABCDEFGHIJKLMNOPQRSTUVWXYZ#####_###############0123456789######'
d = util.hex2bin(data(msg))
cs = ''
cs += chars[util.bin2int(d[8:14])]
cs += chars[util.bin2int(d[14:20])]
cs += chars[util.bin2int(d[20:26])]
cs += chars[util.bin2int(d[26:32])]
cs += chars[util.bin2int(d[32:38])]
cs += chars[util.bin2int(d[38:44])]
cs += chars[util.bin2int(d[44:50])]
cs += chars[util.bin2int(d[50:56])]
return cs
# ------------------------------------------
# DF 20/21, BDS 4,0
# ------------------------------------------
def isBDS40(msg):
"""Check if a message is likely to be BDS code 4,0
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
bool: True or False
"""
# status bit 1, 14, and 27
d = util.hex2bin(data(msg))
result = True
result = result & checkbits(d, 1, 2, 13) \
& checkbits(d, 14, 15, 26) & checkbits(d, 27, 28, 39)
# bits 40-47 and 52-53 shall all be zero
if util.bin2int(d[39:47]) != 0:
result &= False
if util.bin2int(d[51:53]) != 0:
result &= False
return result
def alt_mcp(msg):
"""Selected altitude, MCP/FCU
Args:
msg (String): 28 bytes hexadecimal message (BDS40) string
Returns:
int: altitude in feet
"""
d = util.hex2bin(data(msg))
alt = util.bin2int(d[1:13]) * 16 # ft
return alt
def alt_fms(msg):
"""Selected altitude, FMS
Args:
msg (String): 28 bytes hexadecimal message (BDS40) string
Returns:
int: altitude in feet
"""
d = util.hex2bin(data(msg))
alt = util.bin2int(d[14:26]) * 16 # ft
return alt
def pbaro(msg):
"""Barometric pressure setting
Args:
msg (String): 28 bytes hexadecimal message (BDS40) string
Returns:
float: pressure in millibar
"""
d = util.hex2bin(data(msg))
p = util.bin2int(d[27:39]) * 0.1 + 800 # millibar
return p
# ------------------------------------------
# DF 20/21, BDS 5,0
# ------------------------------------------
def isBDS50(msg):
"""Check if a message is likely to be BDS code 5,0
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
bool: True or False
"""
# status bit 1, 12, 24, 35, 46
d = util.hex2bin(data(msg))
result = True
result = result & checkbits(d, 1, 3, 11) & checkbits(d, 12, 13, 23) \
& checkbits(d, 24, 25, 34) & checkbits(d, 35, 36, 45) \
& checkbits(d, 46, 47, 56)
if d[2:11] == "000000000":
result &= True
else:
if abs(roll(msg)) > 30:
result &= False
if gs(msg) > 500:
result &= False
if tas(msg) > 500:
result &= False
if abs(tas(msg) - gs(msg)) > 100:
result &= False
return result
def roll(msg):
"""Aircraft roll angle
Args:
msg (String): 28 bytes hexadecimal message (BDS50) string
Returns:
float: angle in degrees,
negative->left wing down, positive->right wing down
"""
d = util.hex2bin(data(msg))
sign = int(d[1]) # 1 -> left wing down
value = util.bin2int(d[2:11]) * 45 / 256.0 # degree
angle = -1 * value if sign else value
return round(angle, 1)
def track(msg):
"""True track angle
Args:
msg (String): 28 bytes hexadecimal message (BDS50) string
Returns:
float: angle in degrees to true north (from 0 to 360)
"""
d = util.hex2bin(data(msg))
sign = int(d[12]) # 1 -> west
value = util.bin2int(d[13:23]) * 90 / 512.0 # degree
angle = 360 - value if sign else value
return round(angle, 1)
def gs(msg):
"""Aircraft ground speed
Args:
msg (String): 28 bytes hexadecimal message (BDS50) string
Returns:
int: ground speed in knots
"""
d = util.hex2bin(data(msg))
spd = util.bin2int(d[24:34]) * 2 # kts
return spd
def rtrack(msg):
"""Track angle rate
Args:
msg (String): 28 bytes hexadecimal message (BDS50) string
Returns:
float: angle rate in degrees/second
"""
d = util.hex2bin(data(msg))
sign = int(d[35]) # 1 -> minus
value = util.bin2int(d[36:45]) * 8 / 256.0 # degree / sec
angle = -1 * value if sign else value
return round(angle, 3)
def tas(msg):
"""Aircraft true airspeed
Args:
msg (String): 28 bytes hexadecimal message (BDS50) string
Returns:
int: true airspeed in knots
"""
d = util.hex2bin(data(msg))
spd = util.bin2int(d[46:56]) * 2 # kts
return spd
# ------------------------------------------
# DF 20/21, BDS 6,0
# ------------------------------------------
def isBDS60(msg):
"""Check if a message is likely to be BDS code 6,0
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
bool: True or False
"""
# status bit 1, 13, 24, 35, 46
d = util.hex2bin(data(msg))
result = True
result = result & checkbits(d, 1, 2, 12) & checkbits(d, 13, 14, 23) \
& checkbits(d, 24, 25, 34) & checkbits(d, 35, 36, 45) \
& checkbits(d, 46, 47, 56)
if not (1 < ias(msg) < 500):
result &= False
if not (0.0 < mach(msg) < 1.0):
result &= False
if abs(baro_vr(msg)) > 5000:
result &= False
if abs(ins_vr(msg)) > 5000:
result &= False
return result
def heading(msg):
"""Megnetic heading of aircraft
Args:
msg (String): 28 bytes hexadecimal message (BDS60) string
Returns:
float: heading in degrees to megnetic north (from 0 to 360)
"""
d = util.hex2bin(data(msg))
sign = int(d[1]) # 1 -> west
value = util.bin2int(d[2:12]) * 90 / 512.0 # degree
hdg = 360 - value if sign else value
return round(hdg, 1)
def ias(msg):
"""Indicated airspeed
Args:
msg (String): 28 bytes hexadecimal message (BDS60) string
Returns:
int: indicated airspeed in knots
"""
d = util.hex2bin(data(msg))
ias = util.bin2int(d[13:23]) # kts
return ias
def mach(msg):
"""Aircraft MACH number
Args:
msg (String): 28 bytes hexadecimal message (BDS60) string
Returns:
float: MACH number
"""
d = util.hex2bin(data(msg))
mach = util.bin2int(d[24:34]) * 2.048 / 512.0
return round(mach, 3)
def baro_vr(msg):
"""Vertical rate from barometric measurement
Args:
msg (String): 28 bytes hexadecimal message (BDS60) string
Returns:
int: vertical rate in feet/minutes
"""
d = util.hex2bin(data(msg))
sign = d[35] # 1 -> minus
value = util.bin2int(d[36:45]) * 32 # feet/min
roc = -1*value if sign else value
return roc
def ins_vr(msg):
"""Vertical rate messured by onbard equiments (IRS, AHRS)
Args:
msg (String): 28 bytes hexadecimal message (BDS60) string
Returns:
int: vertical rate in feet/minutes
"""
d = util.hex2bin(data(msg))
sign = d[46] # 1 -> minus
value = util.bin2int(d[47:56]) * 32 # feet/min
roc = -1*value if sign else value
return roc
def BDS(msg):
"""Estimate the most likely BDS code of an message
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
String|None: Version: "BDS40", "BDS50", or "BDS60". Or None, if nothing
matched
"""
is2 = isBDS20(msg)
is4 = isBDS40(msg)
is5 = isBDS50(msg)
is6 = isBDS60(msg)
if is2 and not is4 and not is5 and not is6:
return "BDS20"
elif not is2 and is4 and not is5 and not is6:
return "BDS40"
elif not is2 and not is4 and is5 and not is6:
return "BDS50"
elif not is2 and not is4 and not is5 and is6:
return "BDS60"
else:
return None

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"""
Common functions for ADS-B and Mode-S EHS decoder
Copyright (C) 2015 Junzi Sun (TU Delft)
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""
import math
MODES_CHECKSUM_TABLE = [
0x3935ea, 0x1c9af5, 0xf1b77e, 0x78dbbf,
0xc397db, 0x9e31e9, 0xb0e2f0, 0x587178,
0x2c38bc, 0x161c5e, 0x0b0e2f, 0xfa7d13,
0x82c48d, 0xbe9842, 0x5f4c21, 0xd05c14,
0x682e0a, 0x341705, 0xe5f186, 0x72f8c3,
0xc68665, 0x9cb936, 0x4e5c9b, 0xd8d449,
0x939020, 0x49c810, 0x24e408, 0x127204,
0x093902, 0x049c81, 0xfdb444, 0x7eda22,
0x3f6d11, 0xe04c8c, 0x702646, 0x381323,
0xe3f395, 0x8e03ce, 0x4701e7, 0xdc7af7,
0x91c77f, 0xb719bb, 0xa476d9, 0xadc168,
0x56e0b4, 0x2b705a, 0x15b82d, 0xf52612,
0x7a9309, 0xc2b380, 0x6159c0, 0x30ace0,
0x185670, 0x0c2b38, 0x06159c, 0x030ace,
0x018567, 0xff38b7, 0x80665f, 0xbfc92b,
0xa01e91, 0xaff54c, 0x57faa6, 0x2bfd53,
0xea04ad, 0x8af852, 0x457c29, 0xdd4410,
0x6ea208, 0x375104, 0x1ba882, 0x0dd441,
0xf91024, 0x7c8812, 0x3e4409, 0xe0d800,
0x706c00, 0x383600, 0x1c1b00, 0x0e0d80,
0x0706c0, 0x038360, 0x01c1b0, 0x00e0d8,
0x00706c, 0x003836, 0x001c1b, 0xfff409,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000
]
def hex2bin(hexstr):
"""Convert a hexdecimal string to binary string, with zero fillings. """
scale = 16
num_of_bits = len(hexstr) * math.log(scale, 2)
binstr = bin(int(hexstr, scale))[2:].zfill(int(num_of_bits))
return binstr
def bin2int(binstr):
return int(binstr, 2)
def hex2int(hexstr):
return int(hexstr, 16)
def df(msg):
"""Decode Downlink Format vaule, bits 1 to 5."""
msgbin = hex2bin(msg)
return bin2int(msgbin[0: 5])

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import decoder
print '*************************'
print 'Testing the ADS-B decoder'
print '*************************'
print
# decode call sign test
print "------- Test Callsign -------"
msg_cs = '8D51004E20092578DB782072C825'
cs = decoder.get_callsign(msg_cs)
print 'Message:', msg_cs
print 'Call sign:', cs
print
# decode position
print "------- Test Postiions -------"
msg_pos_0 = '8D40058B58C901375147EFD09357'
msg_pos_1 = '8D40058B58C904A87F402D3B8C59'
t0 = 1446332400
t1 = 1446332405
pos = decoder.get_position(msg_pos_0, msg_pos_1, t0, t1)
print 'Message E:', msg_pos_0
print 'Message O:', msg_pos_1
print 'Position:', pos
print
# decode velocity
print "------- Test Velocity -------"
msg_v_s1 = '8D485020994409940838175B284F' # subtype 1
msg_v_s3 = '8DA05F219B06B6AF189400CBC33F' # subtype 3
v1 = decoder.get_velocity(msg_v_s1)
v2 = decoder.get_velocity(msg_v_s3)
print 'Message:', msg_v_s1
print 'velocity:', v1
print 'Message:', msg_v_s3
print 'velocity:', v2
print
# test NIC
print "------- Test NIC -------"
msg_nic = '8D40621D58C382D690C8AC2863A7'
nic = decoder.get_nic(msg_nic)
print 'Message:', msg_nic
print 'NIC:', nic
print

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"""A setuptools based setup module.
See:
https://packaging.python.org/en/latest/distributing.html
https://github.com/pypa/sampleproject
"""
# Always prefer setuptools over distutils
from setuptools import setup, find_packages
# To use a consistent encoding
from codecs import open
from os import path
here = path.abspath(path.dirname(__file__))
# Get the long description from the README file
with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
long_description = f.read()
setup(
name='pyModeS',
# Versions should comply with PEP440. For a discussion on single-sourcing
# the version across setup.py and the project code, see
# https://packaging.python.org/en/latest/single_source_version.html
version='1.0.2',
description='Python Mode-S Decoder',
long_description=long_description,
# The project's main homepage.
url='https://github.com/junzis/pyModes',
# Author details
author='Junzi Sun',
author_email='j.sun-1@tudelft.nl',
# Choose your license
license='GNU GPL v3',
# See https://pypi.python.org/pypi?%3Aaction=list_classifiers
classifiers=[
# How mature is this project? Common values are
# 3 - Alpha
# 4 - Beta
# 5 - Production/Stable
'Development Status :: 3 - Alpha',
# Indicate who your project is intended for
'Intended Audience :: Developers',
'Topic :: Software Development :: Build Tools',
# Pick your license as you wish (should match "license" above)
'License :: OSI Approved :: MIT License',
# Specify the Python versions you support here. In particular, ensure
# that you indicate whether you support Python 2, Python 3 or both.
'Programming Language :: Python :: 2',
'Programming Language :: Python :: 2.6',
'Programming Language :: Python :: 2.7',
# 'Programming Language :: Python :: 3',
# 'Programming Language :: Python :: 3.3',
# 'Programming Language :: Python :: 3.4',
# 'Programming Language :: Python :: 3.5',
],
# What does your project relate to?
keywords='Mode-S ADS-B EHS decoding',
# You can just specify the packages manually here if your project is
# simple. Or you can use find_packages().
packages=find_packages(exclude=['contrib', 'docs', 'tests']),
# Alternatively, if you want to distribute just a my_module.py, uncomment
# this:
# py_modules=["my_module"],
# List run-time dependencies here. These will be installed by pip when
# your project is installed. For an analysis of "install_requires" vs pip's
# requirements files see:
# https://packaging.python.org/en/latest/requirements.html
install_requires=[''],
# List additional groups of dependencies here (e.g. development
# dependencies). You can install these using the following syntax,
# for example:
# $ pip install -e .[dev,test]
# extras_require={
# 'dev': ['check-manifest'],
# 'test': ['coverage'],
# },
# If there are data files included in your packages that need to be
# installed, specify them here. If using Python 2.6 or less, then these
# have to be included in MANIFEST.in as well.
# package_data={
# 'sample': ['package_data.dat'],
# },
# Although 'package_data' is the preferred approach, in some case you may
# need to place data files outside of your packages. See:
# http://docs.python.org/3.4/distutils/setupscript.html#installing-additional-files # noqa
# In this case, 'data_file' will be installed into '<sys.prefix>/my_data'
# data_files=[('my_data', ['data/data_file'])],
# To provide executable scripts, use entry points in preference to the
# "scripts" keyword. Entry points provide cross-platform support and allow
# pip to create the appropriate form of executable for the target platform.
# entry_points={
# 'console_scripts': [
# 'sample=sample:main',
# ],
# },
)

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# the inclusion of the tests module is not meant to offer best practices for
# testing in general, but rather to support the `find_packages` example in
# setup.py that excludes installing the "tests" package

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import os, sys, inspect
currentdir = os.path.dirname(os.path.abspath(
inspect.getfile(inspect.currentframe())))
parentdir = os.path.dirname(currentdir)
sys.path.insert(0, parentdir)
import pyModeS as pms
from pyModeS import adsb
from pyModeS import ehs
# === TEST ADS-B package ===
def test_adsb_icao():
assert adsb.icao("8D406B902015A678D4D220AA4BDA") == "406B90"
def test_adsb_category():
assert adsb.category("8D406B902015A678D4D220AA4BDA") == 5
def test_adsb_callsign():
assert adsb.callsign("8D406B902015A678D4D220AA4BDA") == "EZY85MH_"
def test_adsb_position():
pos = adsb.position("8D40058B58C901375147EFD09357",
"8D40058B58C904A87F402D3B8C59",
1446332400, 1446332405)
assert pos == (49.81755, 6.08442)
def test_adsb_alt():
assert adsb.altitude("8D40058B58C901375147EFD09357") == 39000
def test_adsb_velocity():
vgs = adsb.velocity("8D485020994409940838175B284F")
vas = adsb.velocity("8DA05F219B06B6AF189400CBC33F")
assert vgs == (159, 182.9, -263, 'GS')
assert vas == (376, 244.0, -274, 'AS')
def test_nic():
assert adsb.nic('8D3C70A390AB11F55B8C57F65FE6') == 0
assert adsb.nic('8DE1C9738A4A430B427D219C8225') == 1
assert adsb.nic('8D44058880B50006B1773DC2A7E9') == 2
assert adsb.nic('8D44058881B50006B1773DC2A7E9') == 3
assert adsb.nic('8D4AB42A78000640000000FA0D0A') == 4
assert adsb.nic('8D4405887099F5D9772F37F86CB6') == 5
assert adsb.nic('8D4841A86841528E72D9B472DAC2') == 6
assert adsb.nic('8D44057560B9760C0B840A51C89F') == 7
assert adsb.nic('8D40621D58C382D690C8AC2863A7') == 8
assert adsb.nic('8F48511C598D04F12CCF82451642') == 9
assert adsb.nic('8DA4D53A50DBF8C6330F3B35458F') == 10
assert adsb.nic('8D3C4ACF4859F1736F8E8ADF4D67') == 11
# === TEST Mode-S EHS package ===
def test_ehs_icao():
assert ehs.icao("A0001839CA3800315800007448D9") == '400940'
assert ehs.icao("A000139381951536E024D4CCF6B5") == '3C4DD2'
assert ehs.icao("A000029CFFBAA11E2004727281F1") == '4243D0'
def test_ehs_BDS():
assert ehs.BDS("A0001838201584F23468207CDFA5") == 'BDS20'
assert ehs.BDS("A0001839CA3800315800007448D9") == 'BDS40'
assert ehs.BDS("A000139381951536E024D4CCF6B5") == 'BDS50'
assert ehs.BDS("A000029CFFBAA11E2004727281F1") == 'BDS60'
assert ehs.BDS("A0281838CAE9E12FA03FFF2DDDE5") is None
def test_ehs_BDS20_callsign():
assert ehs.callsign("A000083E202CC371C31DE0AA1CCF") == 'KLM1017_'
assert ehs.callsign("A0001993202422F2E37CE038738E") == 'IBK2873_'
def test_ehs_BDS40_functions():
assert ehs.alt_mcp("A000029C85E42F313000007047D3") == 3008
assert ehs.alt_fms("A000029C85E42F313000007047D3") == 3008
assert ehs.pbaro("A000029C85E42F313000007047D3") == 1020.0
def test_ehs_BDS50_functions():
assert ehs.roll("A000139381951536E024D4CCF6B5") == 2.1
assert ehs.track("A000139381951536E024D4CCF6B5") == 114.3
assert ehs.gs("A000139381951536E024D4CCF6B5") == 438
assert ehs.rtrack("A000139381951536E024D4CCF6B5") == 0.125
assert ehs.tas("A000139381951536E024D4CCF6B5") == 424
def test_ehs_BDS60_functions():
assert ehs.heading("A000029CFFBAA11E2004727281F1") == 180.9
assert ehs.ias("A000029CFFBAA11E2004727281F1") == 336
assert ehs.mach("A000029CFFBAA11E2004727281F1") == 0.48
assert ehs.baro_vr("A000029CFFBAA11E2004727281F1") == 0
assert ehs.ins_vr("A000029CFFBAA11E2004727281F1") == -3648
# === Decode sample data file ===
def adsb_decode_all(n=None):
print "===== Decode all ADS-B sample data====="
import csv
f = open('adsb.csv', 'rt')
msg0 = None
msg1 = None
for i, r in enumerate(csv.reader(f)):
if n and i > n:
break
ts = r[0]
m = r[1]
icao = adsb.icao(m)
tc = adsb.typecode(m)
if 1 <= tc <= 4:
print ts, m, icao, tc, adsb.category(m), adsb.callsign(m)
if tc == 19:
print ts, m, icao, tc, adsb.velocity(m)
if 5 <= tc <= 18:
if adsb.oe_flag(m):
msg1 = m
t1 = ts
else:
msg0 = m
t0 = ts
if msg0 and msg1:
pos = adsb.position(msg0, msg1, t0, t1)
alt = adsb.altitude(m)
print ts, m, icao, tc, pos, alt
def ehs_decode_all(n=None):
print "===== Decode all Mode-S EHS sample data====="
import csv
f = open('ehs.csv', 'rt')
for i, r in enumerate(csv.reader(f)):
if n and i > n:
break
ts = r[1]
m = r[2]
icao = ehs.icao(m)
vBDS = ehs.BDS(m)
if vBDS:
if vBDS == "BDS20":
print ts, m, icao, vBDS, ehs.callsign(m)
if vBDS == "BDS40":
print ts, m, icao, vBDS, ehs.alt_mcp(m), \
ehs.alt_fms(m), ehs.pbaro(m)
if vBDS == "BDS50":
print ts, m, icao, vBDS, ehs.roll(m), ehs.track(m), \
ehs.gs(m), ehs.rtrack(m), ehs.tas(m)
if vBDS == "BDS60":
print ts, m, icao, vBDS, ehs.heading(m), ehs.ias(m), \
ehs.mach(m), ehs.baro_vr(m), ehs.ins_vr(m)
else:
print ts, m, icao, vBDS
if __name__ == '__main__':
adsb_decode_all(100)
ehs_decode_all(100)