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rework BDS 44 and 45

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pull/39/head
Junzi Sun 6 years ago
parent b97299ce1b
commit abdafd7dea
2 changed files with 190 additions and 105 deletions
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177
pyModeS/decoder/bds/bds44.py
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@ -21,8 +21,10 @@
from __future__ import absolute_import, print_function, division
from pyModeS.decoder.common import hex2bin, bin2int, data, allzeros, wrongstatus
def is44(msg, rev=False):
"""Check if a message is likely to be BDS code 4,4
def is44(msg):
"""Check if a message is likely to be BDS code 4,4.
Meteorological routine air report
Args:
@ -31,68 +33,47 @@ def is44(msg, rev=False):
Returns:
bool: True or False
"""
"""
if allzeros(msg):
return False
d = hex2bin(data(msg))
# status bit 5, 35, 47, 50
if wrongstatus(d, 5, 6, 23):
return False
if not rev:
# status bit 5, 35, 47, 50
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 bin2int(d[0:4]) > 4:
return False
else:
# status bit 5, 15, 24, 36, 49
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, 35, 36, 46):
return False
if wrongstatus(d, 36, 37, 47):
return False
if wrongstatus(d, 47, 48, 49):
return False
if wrongstatus(d, 49, 50, 56):
return False
if wrongstatus(d, 50, 51, 56):
return False
# Bits 1-4 are reserved and should be zero
if bin2int(d[0:4]) != 0:
return False
# Bits 1-4 indicate source, values > 4 reserved and should not occur
if bin2int(d[0:4]) > 4:
return False
vw = wind44(msg, rev=rev)
vw = wind44(msg)
if vw is not None and vw[0] > 250:
return False
if temp44(msg):
if temp44(msg) > 60 or temp44(msg) < -80:
temp = temp44(msg)
if temp:
if temp > 60 or temp < -80:
return False
elif temp44(msg) == 0:
elif temp == 0:
return False
return True
def wind44(msg, rev=False):
"""reported wind speed and direction
def wind44(msg):
"""Wind speed and direction.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
@ -100,32 +81,22 @@ def wind44(msg, rev=False):
Returns:
(int, float): speed (kt), direction (degree)
"""
d = hex2bin(data(msg))
if not rev:
status = int(d[4])
if not status:
return None
speed = bin2int(d[5:14]) # knots
direction = bin2int(d[14:23]) * 180.0 / 256.0 # degree
else:
spd_status = int(d[4])
dir_status = int(d[14])
if (not spd_status) or (not dir_status):
return None
status = int(d[4])
if not status:
return None
speed = bin2int(d[5:14]) # knots
direction = bin2int(d[15:23]) * 180.0 / 128.0 # degree
speed = bin2int(d[5:14]) # knots
direction = bin2int(d[14:23]) * 180.0 / 256.0 # degree
return round(speed, 0), round(direction, 1)
def temp44(msg, rev=False):
"""reported air temperature
def temp44(msg):
"""Static air temperature.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
@ -133,39 +104,27 @@ def temp44(msg, rev=False):
Returns:
float: tmeperature in Celsius degree
"""
d = hex2bin(data(msg))
if not rev:
# if d[22] == '0':
# return None
sign = int(d[23])
value = bin2int(d[24:34])
if sign:
value = value - 1024
# if d[22] == '0':
# return None
temp = value * 0.125 # celsius
temp = round(temp, 1)
else:
# if d[23] == '0':
# return None
sign = int(d[23])
value = bin2int(d[24:34])
sign = int(d[24])
value = bin2int(d[25:35])
if sign:
value = value - 1024
if sign:
value = value - 1024
temp = value * 0.125 # celsius
temp = round(temp, 1)
temp = value * 0.125 # celsius
temp = round(temp, 1)
return temp
def p44(msg, rev=False):
"""reported average static pressure
def p44(msg):
"""Static pressure.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
@ -173,26 +132,20 @@ def p44(msg, rev=False):
Returns:
int: static pressure in hPa
"""
d = hex2bin(data(msg))
if not rev:
if d[34] == '0':
return None
p = bin2int(d[35:46]) # hPa
if d[34] == '0':
return None
else:
if d[35] == '0':
return None
p = bin2int(d[36:47]) # hPa
p = bin2int(d[35:46]) # hPa
return p
def hum44(msg, rev=False):
"""reported humidity
def hum44(msg):
"""humidity
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
@ -203,16 +156,30 @@ def hum44(msg, rev=False):
"""
d = hex2bin(data(msg))
if not rev:
if d[49] == '0':
return None
if d[49] == '0':
return None
hm = bin2int(d[50:56]) * 100.0 / 64 # %
hm = bin2int(d[50:56]) * 100.0 / 64 # %
else:
if d[48] == '0':
return None
return round(hm, 1)
hm = bin2int(d[49:56]) # %
return round(hm, 1)
def turb44(msg):
"""Turblence.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
rev (bool): using revised version
Returns:
int: turbulence level. 0: NIL, 1: Light, 2: Moderate, 3: Severe
"""
d = hex2bin(data(msg))
if d[46] == '0':
return None
turb = bin2int(d[47:49])
return turb

118
pyModeS/decoder/bds/bds45.py
Unescape View File

@ -0,0 +1,118 @@
# Copyright (C) 2018 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/>.
# ------------------------------------------
# BDS 4,5
# Meteorological hazard report
# ------------------------------------------
from __future__ import absolute_import, print_function, division
from pyModeS.decoder.common import hex2bin, bin2int, data, allzeros, wrongstatus
def is45(msg):
"""Check if a message is likely to be BDS code 4,5.
Meteorological harzard report
Args:
msg (String): 28 bytes hexadecimal message string
rev (bool): using revised version
Returns:
bool: True or False
"""
if allzeros(msg):
return False
d = hex2bin(data(msg))
# status bit 1, 4, 7, 10, 13, 16, 27, 39
if wrongstatus(d, 1, 2, 3):
return False
if wrongstatus(d, 4, 5, 6):
return False
if wrongstatus(d, 7, 8, 9):
return False
if wrongstatus(d, 10, 11, 12):
return False
if wrongstatus(d, 13, 14, 15):
return False
if wrongstatus(d, 16, 17, 26):
return False
if wrongstatus(d, 17, 28, 38):
return False
if wrongstatus(d, 39, 40, 51):
return False
# reserved
if bin2int(d[51:56]) != 0:
return False
temp = temp45(msg)
if temp:
if temp > 60 or temp < -80:
return False
return True
def temp45(msg):
"""Static air temperature.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
rev (bool): using revised version
Returns:
float: tmeperature in Celsius degree
"""
d = hex2bin(data(msg))
sign = int(d[16])
value = bin2int(d[17:26])
if sign:
value = value - 512
temp = value * 0.25 # celsius
temp = round(temp, 1)
return temp
def p44(msg, rev=False):
"""Average static pressure.
Args:
msg (String): 28 bytes hexadecimal message (BDS44) string
rev (bool): using revised version
Returns:
int: static pressure in hPa
"""
d = hex2bin(data(msg))
p = bin2int(d[27:38]) # hPa
return p
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