update EHS BDS identification, add isBDS50or60() function
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Junzi Sun
parent
5697e5b88e
commit
4911e69171
@ -6,3 +6,5 @@ from .decoder import ehs
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from .decoder import els
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from .decoder import util
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from .decoder import modes_common
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from .extra import aero
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from .extra import beastclient
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@ -18,8 +18,9 @@ A python package for decoding ModeS (DF20, DF21) messages.
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"""
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from __future__ import absolute_import, print_function, division
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from . import util, modes_common
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from scipy.stats import multivariate_normal
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import numpy as np
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from pyModeS.decoder import util, modes_common
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from pyModeS.extra import aero
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def icao(msg):
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return modes_common.icao(msg)
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@ -972,6 +973,61 @@ def vr60ins(msg):
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return roc
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def isBDS50or60(msg, spd_ref, trk_ref, alt_ref):
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"""Use reference ground speed and trk to determine BDS50 and DBS60
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Args:
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msg (String): 28 bytes hexadecimal message string
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spd_ref (float): reference speed (ADS-B ground speed), kts
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trk_ref (float): reference track (ADS-B track angle), deg
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alt_ref (float): reference altitude (ADS-B altitude), ft
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Returns:
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String or None: BDS version, or possible versions, or None if nothing matches.
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"""
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def vxy(v, angle):
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vx = v * np.sin(np.deg2rad(angle))
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vy = v * np.cos(np.deg2rad(angle))
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return vx, vy
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if not (isBDS50(msg) and isBDS60(msg)):
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return None
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h50 = trk50(msg)
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v50 = gs50(msg)
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h50 = np.nan if h50 is None else h50
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v50 = np.nan if v50 is None else v50
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h60 = hdg60(msg)
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m60 = mach60(msg)
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i60 = ias60(msg)
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h60 = np.nan if h60 is None else h60
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m60 = np.nan if m60 is None else m60
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i60 = np.nan if i60 is None else i60
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XY5 = vxy(v50*aero.kts, h50)
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XY6m = vxy(aero.mach2tas(m60, alt_ref*aero.ft), h60)
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XY6i = vxy(aero.cas2tas(i60*aero.kts, alt_ref*aero.ft), h60)
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allbds = ['BDS50', 'BDS60', 'BDS60']
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X = np.array([XY5, XY6m, XY6i])
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Mu = np.array(vxy(spd_ref*aero.kts, trk_ref*aero.kts))
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# compute Mahalanobis distance matrix
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# Cov = [[20**2, 0], [0, 20**2]]
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# mmatrix = np.sqrt(np.dot(np.dot(X-Mu, np.linalg.inv(Cov)), (X-Mu).T))
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# dist = np.diag(mmatrix)
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# since the covariance matrix is identity matrix,
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# M-dist is same as eculidian distance
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dist = np.linalg.norm(X-Mu, axis=1)
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BDS = allbds[np.nanargmin(dist)]
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return BDS
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def BDS(msg):
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"""Estimate the most likely BDS code of an message
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@ -994,78 +1050,16 @@ def BDS(msg):
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is53 = isBDS53(msg)
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is60 = isBDS60(msg)
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BDS = ["BDS17", "BDS20", "BDS40", "BDS44", "BDS44REV", "BDS50", "BDS53", "BDS60"]
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allbds = np.array([
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"BDS17", "BDS20", "BDS40", "BDS44", "BDS44REV",
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"BDS50", "BDS53", "BDS60"
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])
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isBDS = [is17, is20, is40, is44, is44rev, is50, is53, is60]
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if sum(isBDS) == 0:
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bds = ','.join(sorted(allbds[isBDS]))
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if len(bds) == 0:
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return None
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elif sum(isBDS) == 1:
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return BDS[isBDS.index(True)]
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else:
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bds_ = [bds for (bds, i) in zip(BDS, isBDS) if i]
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return ','.join(bds_)
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def Vxy(V, angle):
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Vx = V*np.sin(np.deg2rad(angle))
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Vy = V*np.cos(np.deg2rad(angle))
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return Vx, Vy
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def BDSv2(msg, SPDref=np.nan, TRKref=np.nan, ALTref=np.nan):
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"""Use probabilistic method to determine the most likely BDS code of an message
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Args:
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msg (String): 28 bytes hexadecimal message string
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SPDref (float): reference speed (for example ADS-B GS)
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TRKref (float): reference track (for example ADS-B TRK)
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ALTref (float): reference altitude (for example ADS-B altitude)
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Returns:
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String or None: BDS version, or possible versions, or None if nothing matches.
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"""
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BDS = pms.ehs.BDS(msg)
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if type(BDS) != list:
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return BDS
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else:
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if 'BDS53' in BDS:
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BDS.remove('BDS53')
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if 'BDS40' in BDS:
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fms = pms.ehs.alt40fms(msg)
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mcp = pms.ehs.alt40mcp(msg)
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baro = pms.ehs.p40baro(msg)
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if fms != None:
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if (((fms % 100) <= 8) or ((fms % 100) >= 92)) and fms < 50500:
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return 'BDS40'
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if mcp != None:
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if (((mcp % 100) <= 8) or ((mcp % 100) >= 92)) and mcp < 50500:
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return 'BDS40'
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if baro != None:
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if (983 <= baro <= 1043): #1013 -+ 30
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return 'BDS40'
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if set(BDS).issubset(['BDS50', 'BDS60']):
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if ~(np.isnan(SPDref) or np.isnan(TRKref) or np.isnan(ALTref)):
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meanV = Vxy(SPDref, TRKref)
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sigmaV = 20
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covV = [[sigmaV**2, 0], [0, sigmaV**2]]
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try: # Because register field is not available.
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pBDS50 = multivariate_normal(meanV, covV).pdf(Vxy(pms.ehs.gs50(msg), pms.ehs.trk50(msg)))
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pBDS60_1 = multivariate_normal(meanV, covV).pdf(Vxy(aero.mach2tas(pms.ehs.mach60(msg), ALTref*aero.ft)/aero.kts, pms.ehs.hdg60(msg)))
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pBDS60_2 = multivariate_normal(meanV, covV).pdf(Vxy(aero.cas2tas(pms.ehs.ias60(msg)*aero.kts, ALTref*aero.ft)/aero.kts, pms.ehs.hdg60(msg)))
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pBDS60 = max(pBDS60_1, pBDS60_2)
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except:
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return BDS
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if pBDS50 + pBDS60 > 0: #Avoid None values
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if pBDS50 > pBDS60:
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return 'BDS50'
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elif pBDS50 < pBDS60:
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return 'BDS60'
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return BDS
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return bds
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1
pyModeS/extra/__init__.py
Normal file
1
pyModeS/extra/__init__.py
Normal file
@ -0,0 +1 @@
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from __future__ import absolute_import, print_function, division
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@ -11,12 +11,12 @@ International Standard Atmosphere
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rho = density(H) # calls atmos but retruns only pressure [Pa]
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Speed conversion at altitude H[m] in ISA:
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Mach = tas2mach(Vtas,H) # true airspeed (Vtas) to mach number conversion
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Mach = tas2mach(Vtas,H) # true airspeed (Vtas) to mach number conversion
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Vtas = mach2tas(Mach,H) # true airspeed (Vtas) to mach number conversion
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Vtas = eas2tas(Veas,H) # equivalent airspeed to true airspeed, H in [m]
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Veas = tas2eas(Vtas,H) # true airspeed to equivent airspeed, H in [m]
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Vtas = cas2tas(Vcas,H) # Vcas to Vtas conversion both m/s, H in [m]
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Vcas = tas2cas(Vtas,H) # Vtas to Vcas conversion both m/s, H in [m]
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Vtas = eas2tas(Veas,H) # equivalent airspeed to true airspeed, H in [m]
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Veas = tas2eas(Vtas,H) # true airspeed to equivent airspeed, H in [m]
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Vtas = cas2tas(Vcas,H) # Vcas to Vtas conversion both m/s, H in [m]
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Vcas = tas2cas(Vtas,H) # Vtas to Vcas conversion both m/s, H in [m]
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Vcas = mach2cas(Mach,H) # Mach to Vcas conversion Vcas in m/s, H in [m]
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Mach = cas2mach(Vcas,H) # Vcas to mach copnversion Vcas in m/s, H in [m]
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"""
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@ -95,8 +95,8 @@ def distance(lat1, lon1, lat2, lon2, H=0):
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theta1 = np.radians(lon1)
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theta2 = np.radians(lon2)
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cos = np.sin(phi1) * np.sin(phi2) * np.cos(theta1 - theta2) \
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+ np.cos(phi1) * np.cos(phi2)
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cos = np.sin(phi1) * np.sin(phi2) * np.cos(theta1 - theta2) + np.cos(phi1) * np.cos(phi2)
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cos = np.where(cos>1, 1, cos)
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arc = np.arccos(cos)
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dist = arc * (r_earth + H) # meters, radius of earth
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@ -5,11 +5,11 @@ import argparse
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import curses
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import numpy as np
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import time
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import pyModeS as pms
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from threading import Lock
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from client import BaseClient
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from stream import Stream
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from screen import Screen
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from pyModeS.decoder import util
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from pyModeS.extra.beastclient import BaseClient
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from pyModeS.streamer.stream import Stream
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from pyModeS.streamer.screen import Screen
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LOCK = Lock()
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ADSB_MSG = []
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@ -43,7 +43,7 @@ class ModesClient(BaseClient):
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if len(msg) < 28: # only process long messages
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continue
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df = pms.df(msg)
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df = util.df(msg)
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if df == 17 or df == 18:
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local_buffer_adsb_msg.append(msg)
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@ -1,8 +1,7 @@
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from __future__ import print_function, division
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from __future__ import absolute_import, print_function, division
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import numpy as np
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import time
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import pyModeS as pms
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from pyModeS.decoder import adsb, ehs
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class Stream():
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def __init__(self, lat0, lon0):
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@ -32,8 +31,8 @@ class Stream():
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# process adsb message
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for t, msg in zip(adsb_ts, adsb_msgs):
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icao = pms.adsb.icao(msg)
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tc = pms.adsb.typecode(msg)
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icao = adsb.icao(msg)
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tc = adsb.typecode(msg)
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if icao not in self.acs:
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self.acs[icao] = {
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@ -52,10 +51,10 @@ class Stream():
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self.acs[icao]['t'] = t
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if 1 <= tc <= 4:
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self.acs[icao]['callsign'] = pms.adsb.callsign(msg)
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self.acs[icao]['callsign'] = adsb.callsign(msg)
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if (5 <= tc <= 8) or (tc == 19):
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vdata = pms.adsb.velocity(msg)
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vdata = adsb.velocity(msg)
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if vdata is None:
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continue
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@ -69,7 +68,7 @@ class Stream():
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self.acs[icao]['tv'] = t
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if (5 <= tc <= 18):
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oe = pms.adsb.oe_flag(msg)
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oe = adsb.oe_flag(msg)
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self.acs[icao][oe] = msg
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self.acs[icao]['t'+str(oe)] = t
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@ -77,12 +76,12 @@ class Stream():
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# use single message decoding
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rlat = self.acs[icao]['lat']
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rlon = self.acs[icao]['lon']
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latlon = pms.adsb.position_with_ref(msg, rlat, rlon)
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latlon = adsb.position_with_ref(msg, rlat, rlon)
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elif ('t0' in self.acs[icao]) and ('t1' in self.acs[icao]) and \
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(abs(self.acs[icao]['t0'] - self.acs[icao]['t1']) < 10):
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# use multi message decoding
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try:
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latlon = pms.adsb.position(
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latlon = adsb.position(
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self.acs[icao][0],
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self.acs[icao][1],
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self.acs[icao]['t0'],
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@ -99,29 +98,29 @@ class Stream():
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self.acs[icao]['tpos'] = t
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self.acs[icao]['lat'] = latlon[0]
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self.acs[icao]['lon'] = latlon[1]
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self.acs[icao]['alt'] = pms.adsb.altitude(msg)
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self.acs[icao]['alt'] = adsb.altitude(msg)
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local_updated_acs_buffer.append(icao)
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# process ehs message
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for t, msg in zip(ehs_ts, ehs_msgs):
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icao = pms.ehs.icao(msg)
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icao = ehs.icao(msg)
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if icao not in self.acs:
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continue
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bds = pms.ehs.BDS(msg)
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bds = ehs.BDS(msg)
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if bds == 'BDS50':
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tas = pms.ehs.tas50(msg)
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tas = ehs.tas50(msg)
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if tas:
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self.acs[icao]['t50'] = t
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self.acs[icao]['tas'] = tas
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elif bds == 'BDS60':
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ias = pms.ehs.ias60(msg)
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hdg = pms.ehs.hdg60(msg)
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mach = pms.ehs.mach60(msg)
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ias = ehs.ias60(msg)
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hdg = ehs.hdg60(msg)
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mach = ehs.mach60(msg)
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if ias or hdg or mach:
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self.acs[icao]['t60'] = t
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@ -14,10 +14,14 @@ def test_df20alt():
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def test_ehs_BDS():
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assert ehs.BDS("A0001838201584F23468207CDFA5") == 'BDS20'
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assert ehs.BDS("A0001839CA3800315800007448D9") == 'BDS40'
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# assert ehs.BDS("A000031DBAA9DD18622C441330E9") == 'BDS44'
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assert ehs.BDS("A000139381951536E024D4CCF6B5") == 'BDS50'
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assert ehs.BDS("A00004128F39F91A7E27C46ADC21") == 'BDS60'
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def test_ehs_isBDS50or60():
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assert ehs.isBDS50or60("A0001838201584F23468207CDFA5", 0, 0, 0) == None
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assert ehs.isBDS50or60("A0000000FFDA9517000464000000", 182, 237, 1250) == 'BDS50'
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assert ehs.isBDS50or60("A0000000919A5927E23444000000", 413, 54, 18700) == 'BDS60'
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def test_ehs_BDS20_callsign():
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assert ehs.callsign("A000083E202CC371C31DE0AA1CCF") == 'KLM1017_'
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assert ehs.callsign("A0001993202422F2E37CE038738E") == 'IBK2873_'
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