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add ehs BDS10 decoder, cut redundancies

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pull/17/head
Junzi Sun 7 years ago
parent 4911e69171
commit 8b48fabf5a
6 changed files with 210 additions and 166 deletions
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3
pyModeS/__init__.py
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@ -3,8 +3,7 @@ from __future__ import absolute_import, print_function, division
from .decoder.util import *
from .decoder import adsb
from .decoder import ehs
from .decoder import els
from .decoder import util
from .decoder import modes_common
from .decoder import modes
from .extra import aero
from .extra import beastclient

255
pyModeS/decoder/ehs.py
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@ -19,17 +19,17 @@ A python package for decoding ModeS (DF20, DF21) messages.
from __future__ import absolute_import, print_function, division
import numpy as np
from pyModeS.decoder import util, modes_common
from pyModeS.decoder import util, modes
from pyModeS.extra import aero
def icao(msg):
return modes_common.icao(msg)
return modes.icao(msg)
def data(msg):
"""Return the data frame in the message, bytes 9 to 22"""
return msg[8:22]
def isnull(msg):
def allzeros(msg):
"""check if the data bits are all zeros
Args:
@ -45,7 +45,7 @@ def isnull(msg):
else:
return True
def checkbits(data, sb, msb, lsb):
def wrongstatus(data, sb, msb, lsb):
"""Check if the status bit and field bits are consistency. This Function
is used for checking BDS code versions.
"""
@ -56,44 +56,59 @@ def checkbits(data, sb, msb, lsb):
if not status:
if value != 0:
return False
return True
return False
return True
# ------------------------------------------
# Common functions
# BDS 1,0
# Data link capability report
# ------------------------------------------
def df20alt(msg):
"""Computes the altitude from DF20 message, bit 20-32
def isBDS10(msg):
"""Check if a message is likely to be BDS code 1,0
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
int: altitude in ft
bool: True or False
"""
if util.df(msg) != 20:
raise RuntimeError("Message must be Downlink Format 20.")
if allzeros(msg):
return False
d = util.hex2bin(data(msg))
# first 8 bits must be 0x10
if d[0:8] != '00010000':
return False
return modes_common.altcode(msg)
# bit 10 to 14 are reserved
if util.bin2int(d[9:14]) != 0:
return False
# overlay capabilty conflict
if d[14] == '1' and util.bin2int(d[16:23]) < 5:
return False
if d[14] == '0' and util.bin2int(d[16:23]) > 4:
return False
return True
def df21id(msg):
"""Computes identity (squawk code) from DF21, bit 20-32
def ovc10(msg):
"""Return the overlay control capability
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
string: squawk code
int: Whether the transponder is OVC capable
"""
d = util.hex2bin(data(msg))
if util.df(msg) != 21:
raise RuntimeError("Message must be Downlink Format 21.")
return modes_common.idcode(msg)
return int(d[14])
# ------------------------------------------
# BDS 1,7
@ -110,24 +125,22 @@ def isBDS17(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
d = util.hex2bin(data(msg))
result = True
if util.bin2int(d[28:56]) != 0:
result &= False
return False
caps = cap17(msg)
# basic BDS codes for ADS-B shall be supported
# assuming ADS-B out is installed (2017EU/2020US mandate)
if not set(['BDS05', 'BDS06', 'BDS09', 'BDS20']).issubset(caps):
result &= False
return False
return result
return True
def cap17(msg):
"""Extract capacities from BDS 1,7 message
@ -148,6 +161,7 @@ def cap17(msg):
return capacity
# ------------------------------------------
# BDS 2,0
# Aircraft identification
@ -163,23 +177,22 @@ def isBDS20(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
# status bit 1, 14, and 27
d = util.hex2bin(data(msg))
result = True
# status bit 1, 14, and 27
if util.bin2int(d[0:4]) != 2 or util.bin2int(d[4:8]) != 0:
result &= False
return False
cs = callsign(msg)
if '#' in cs:
result &= False
return False
return result
return True
def callsign(msg):
@ -223,25 +236,31 @@ def isBDS40(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
# status bit 1, 14, and 27
d = util.hex2bin(data(msg))
result = True
# status bit 1, 14, and 27
if wrongstatus(d, 1, 2, 13):
return False
result = result & checkbits(d, 1, 2, 13) \
& checkbits(d, 14, 15, 26) & checkbits(d, 27, 28, 39)
if wrongstatus(d, 14, 15, 26):
return False
if wrongstatus(d, 27, 28, 39):
return False
# bits 40-47 and 52-53 shall all be zero
if util.bin2int(d[39:47]) != 0:
result &= False
return False
if util.bin2int(d[51:53]) != 0:
result &= False
return False
return result
return True
def alt40mcp(msg):
@ -315,44 +334,62 @@ def isBDS44(msg, rev=False):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
d = util.hex2bin(data(msg))
result = True
if not rev:
# status bit 5, 35, 47, 50
result = result & checkbits(d, 5, 6, 23) \
& checkbits(d, 35, 36, 46) & checkbits(d, 47, 48, 49) \
& checkbits(d, 50, 51, 56)
if wrongstatus(d, 5, 6, 23):
return False
if wrongstatus(d, 35, 36, 46):
return False
if wrongstatus(d, 47, 48, 49):
return False
if wrongstatus(d, 50, 51, 56):
return False
# Bits 1-4 indicate source, values > 4 reserved and should not occur
if util.bin2int(d[0:4]) > 4:
result &= False
return False
else:
# status bit 5, 15, 24, 36, 49
result = result & checkbits(d, 5, 6, 14) \
& checkbits(d, 15, 16, 23) & checkbits(d, 24, 25, 35) \
& checkbits(d, 36, 37, 47) & checkbits(d, 49, 50, 56)
if wrongstatus(d, 5, 6, 14):
return False
if wrongstatus(d, 15, 16, 23):
return False
if wrongstatus(d, 24, 25, 35):
return False
if wrongstatus(d, 36, 37, 47):
return False
if wrongstatus(d, 49, 50, 56):
return False
# Bits 1-4 are reserved and should be zero
if util.bin2int(d[0:4]) != 0:
result &= False
if not result:
return False
return False
vw = wind44(msg, rev=rev)
if vw is not None and vw[0] > 250:
result &= False
return False
if temp44(msg):
if temp44(msg) > 60 or temp44(msg) < -80:
result &= False
return False
elif temp44(msg) == 0:
result &= False
return False
return result
return True
def wind44(msg, rev=False):
@ -498,40 +535,45 @@ def isBDS50(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
# status bit 1, 12, 24, 35, 46
d = util.hex2bin(data(msg))
result = True
# status bit 1, 12, 24, 35, 46
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 wrongstatus(d, 1, 3, 11):
return False
if not result:
if wrongstatus(d, 12, 13, 23):
return False
if d[2:11] == "000000000":
result &= True
else:
if wrongstatus(d, 24, 25, 34):
return False
if wrongstatus(d, 35, 36, 45):
return False
if wrongstatus(d, 46, 47, 56):
return False
if d[2:11] != "000000000":
roll = abs(roll50(msg))
if roll and roll > 60:
result &= False
return False
gs = gs50(msg)
if gs is not None and gs > 600:
result &= False
return False
tas = tas50(msg)
if tas is not None and tas > 500:
result &= False
return False
if (gs is not None) and (tas is not None) and (abs(tas - gs) > 200):
result &= False
return False
return result
return True
def roll50(msg):
@ -666,38 +708,45 @@ def isBDS53(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
# status bit 1, 13, 24, 34, 47
d = util.hex2bin(data(msg))
result = True
# status bit 1, 13, 24, 34, 47
result = result & checkbits(d, 1, 3, 12) & checkbits(d, 13, 14, 23) \
& checkbits(d, 24, 25, 33) & checkbits(d, 34, 35, 46) \
& checkbits(d, 47, 49, 56)
if wrongstatus(d, 1, 3, 12):
return False
if wrongstatus(d, 13, 14, 23):
return False
if wrongstatus(d, 24, 25, 33):
return False
if wrongstatus(d, 34, 35, 46):
return False
if not result:
if wrongstatus(d, 47, 49, 56):
return False
ias = ias53(msg)
if ias is not None and ias > 500:
result &= False
return False
mach = mach53(msg)
if mach is not None and mach > 1:
result &= False
return False
tas = tas53(msg)
if tas is not None and tas > 500:
result &= False
return False
vr = vr53(msg)
if vr is not None and abs(vr) > 8000:
result &= False
return False
return result
return True
def hdg53(msg):
@ -822,38 +871,45 @@ def isBDS60(msg):
bool: True or False
"""
if isnull(msg):
if allzeros(msg):
return False
# status bit 1, 13, 24, 35, 46
d = util.hex2bin(data(msg))
result = True
# status bit 1, 13, 24, 35, 46
if wrongstatus(d, 1, 2, 12):
return False
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 wrongstatus(d, 13, 14, 23):
return False
if not result:
if wrongstatus(d, 24, 25, 34):
return False
if wrongstatus(d, 35, 36, 45):
return False
if wrongstatus(d, 46, 47, 56):
return False
ias = ias60(msg)
if ias is not None and ias > 500:
result &= False
return False
mach = mach60(msg)
if mach is not None and mach > 1:
result &= False
return False
vr_baro = vr60baro(msg)
if vr_baro is not None and abs(vr_baro) > 6000:
result &= False
return False
vr_ins = vr60ins(msg)
if vr_ins is not None and abs(vr_ins) > 6000:
result &= False
return False
return result
return True
def hdg60(msg):
@ -1038,9 +1094,10 @@ def BDS(msg):
String or None: BDS version, or possible versions, or None if nothing matches.
"""
if isnull(msg):
if allzeros(msg):
return None
is10 = isBDS10(msg)
is17 = isBDS17(msg)
is20 = isBDS20(msg)
is40 = isBDS40(msg)
@ -1051,11 +1108,11 @@ def BDS(msg):
is60 = isBDS60(msg)
allbds = np.array([
"BDS17", "BDS20", "BDS40", "BDS44", "BDS44REV",
"BDS10", "BDS17", "BDS20", "BDS40", "BDS44", "BDS44REV",
"BDS50", "BDS53", "BDS60"
])
isBDS = [is17, is20, is40, is44, is44rev, is50, is53, is60]
isBDS = [is10, is17, is20, is40, is44, is44rev, is50, is53, is60]
bds = ','.join(sorted(allbds[isBDS]))

37
pyModeS/decoder/els.py
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@ -1,37 +0,0 @@
from __future__ import absolute_import, print_function, division
from . import util, modes_common
def icao(msg):
return modes_common.icao(msg)
def df4alt(msg):
"""Computes the altitude from DF4 message, bit 20-32
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
int: altitude in ft
"""
if util.df(msg) != 4:
raise RuntimeError("Message must be Downlink Format 4.")
return modes_common.altcode(msg)
def df5id(msg):
"""Computes identity (squawk code) from DF5 message, bit 20-32
Args:
msg (String): 28 bytes hexadecimal message string
Returns:
string: squawk code
"""
if util.df(msg) != 5:
raise RuntimeError("Message must be Downlink Format 5.")
return modes_common.idcode(msg)

15
pyModeS/decoder/modes_common.py → pyModeS/decoder/modes.py
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@ -110,13 +110,14 @@ def altcode(msg):
return alt
def gray2alt(codestr):
gc500 = codestr[:8]
n500 = util.gray2int(gc500)
n500 = gray2int(gc500)
# in 100-ft step must be converted first
gc100 = codestr[8:]
n100 = util.gray2int(gc100)
n100 = gray2int(gc100)
if n100 in [0, 5, 6]:
return None
@ -129,3 +130,13 @@ def gray2alt(codestr):
alt = (n500*500 + n100*100) - 1300
return alt
def gray2int(graystr):
"""Convert greycode to binary"""
num = util.bin2int(graystr)
num ^= (num >> 8)
num ^= (num >> 4)
num ^= (num >> 2)
num ^= (num >> 1)
return num

27
pyModeS/decoder/util.py
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@ -97,11 +97,22 @@ def floor(x):
return int(np.floor(x))
def gray2int(graystr):
"""Convert greycode to binary (DF4, 20 altitude coding)"""
num = bin2int(graystr)
num ^= (num >> 8)
num ^= (num >> 4)
num ^= (num >> 2)
num ^= (num >> 1)
return num
def is_icao_assigned(icao):
""" Check whether the ICAO address is assigned (Annex 10, Vol 3)"""
if (icao is None) or (not isinstance(icao, str)) or (len(icao)!=6):
return False
icaoint = hex2int(icao)
if 0x200000 < icaoint < 0x27FFFF: return False # AFI
if 0x280000 < icaoint < 0x28FFFF: return False # SAM
if 0x500000 < icaoint < 0x5FFFFF: return False # EUR, NAT
if 0x600000 < icaoint < 0x67FFFF: return False # MID
if 0x680000 < icaoint < 0x6F0000: return False # ASIA
if 0x900000 < icaoint < 0x9FFFFF: return False # NAM, PAC
if 0xB00000 < icaoint < 0xBFFFFF: return False # CAR
if 0xD00000 < icaoint < 0xDFFFFF: return False # future
if 0xF00000 < icaoint < 0xFFFFFF: return False # future
return True

39
tests/test_ehs.py
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@ -1,5 +1,5 @@
from pyModeS import ehs
from pyModeS import modes_common
from pyModeS import modes
def test_ehs_icao():
assert ehs.icao("A0001839CA3800315800007448D9") == '400940'
@ -7,8 +7,11 @@ def test_ehs_icao():
assert ehs.icao("A000029CFFBAA11E2004727281F1") == '4243D0'
def test_df20alt():
assert ehs.df20alt("A02014B400000000000000F9D514") == 32300
def test_modes_altcode():
assert ehs.modes.altcode("A02014B400000000000000F9D514") == 32300
def test_modes_idcode():
assert ehs.modes.idcode("A800292DFFBBA9383FFCEB903D01") == '1346'
def test_ehs_BDS():
@ -49,18 +52,18 @@ def test_ehs_BDS60_functions():
assert ehs.vr60ins("A00004128F39F91A7E27C46ADC21") == -1920
def test_graycode_to_altitude():
assert modes_common.gray2alt('00000000010') == -1000
assert modes_common.gray2alt('00000001010') == -500
assert modes_common.gray2alt('00000011011') == -100
assert modes_common.gray2alt('00000011010') == 0
assert modes_common.gray2alt('00000011110') == 100
assert modes_common.gray2alt('00000010011') == 600
assert modes_common.gray2alt('00000110010') == 1000
assert modes_common.gray2alt('00001001001') == 5800
assert modes_common.gray2alt('00011100100') == 10300
assert modes_common.gray2alt('01100011010') == 32000
assert modes_common.gray2alt('01110000100') == 46300
assert modes_common.gray2alt('01010101100') == 50200
assert modes_common.gray2alt('11011110100') == 73200
assert modes_common.gray2alt('10000000011') == 126600
assert modes_common.gray2alt('10000000001') == 126700
assert modes.gray2alt('00000000010') == -1000
assert modes.gray2alt('00000001010') == -500
assert modes.gray2alt('00000011011') == -100
assert modes.gray2alt('00000011010') == 0
assert modes.gray2alt('00000011110') == 100
assert modes.gray2alt('00000010011') == 600
assert modes.gray2alt('00000110010') == 1000
assert modes.gray2alt('00001001001') == 5800
assert modes.gray2alt('00011100100') == 10300
assert modes.gray2alt('01100011010') == 32000
assert modes.gray2alt('01110000100') == 46300
assert modes.gray2alt('01010101100') == 50200
assert modes.gray2alt('11011110100') == 73200
assert modes.gray2alt('10000000011') == 126600
assert modes.gray2alt('10000000001') == 126700

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