bug fix: altiude and TAS
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Junzi Sun
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89e67fae31
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3bb8c361e9
@ -34,13 +34,13 @@ def airborne_position(msg0, msg1, t0, t1):
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raise RuntimeError("Both even and odd CPR frames are required.")
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# 131072 is 2^17, since CPR lat and lon are 17 bits each.
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cprlat_even = common.bin2int(mb0[22:39]) / 131072.0
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cprlon_even = common.bin2int(mb0[39:56]) / 131072.0
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cprlat_odd = common.bin2int(mb1[22:39]) / 131072.0
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cprlon_odd = common.bin2int(mb1[39:56]) / 131072.0
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cprlat_even = common.bin2int(mb0[22:39]) / 131072
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cprlon_even = common.bin2int(mb0[39:56]) / 131072
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cprlat_odd = common.bin2int(mb1[22:39]) / 131072
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cprlon_odd = common.bin2int(mb1[39:56]) / 131072
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air_d_lat_even = 360.0 / 60
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air_d_lat_odd = 360.0 / 59
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air_d_lat_even = 360 / 60
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air_d_lat_odd = 360 / 59
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# compute latitude index 'j'
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j = common.floor(59 * cprlat_even - 60 * cprlat_odd + 0.5)
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@ -64,13 +64,13 @@ def airborne_position(msg0, msg1, t0, t1):
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nl = common.cprNL(lat)
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ni = max(common.cprNL(lat) - 0, 1)
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m = common.floor(cprlon_even * (nl - 1) - cprlon_odd * nl + 0.5)
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lon = (360.0 / ni) * (m % ni + cprlon_even)
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lon = (360 / ni) * (m % ni + cprlon_even)
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else:
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lat = lat_odd
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nl = common.cprNL(lat)
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ni = max(common.cprNL(lat) - 1, 1)
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m = common.floor(cprlon_even * (nl - 1) - cprlon_odd * nl + 0.5)
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lon = (360.0 / ni) * (m % ni + cprlon_odd)
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lon = (360 / ni) * (m % ni + cprlon_odd)
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if lon > 180:
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lon = lon - 360
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@ -95,11 +95,11 @@ def airborne_position_with_ref(msg, lat_ref, lon_ref):
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mb = common.hex2bin(msg)[32:]
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cprlat = common.bin2int(mb[22:39]) / 131072.0
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cprlon = common.bin2int(mb[39:56]) / 131072.0
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cprlat = common.bin2int(mb[22:39]) / 131072
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cprlon = common.bin2int(mb[39:56]) / 131072
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i = int(mb[21])
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d_lat = 360.0 / 59 if i else 360.0 / 60
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d_lat = 360 / 59 if i else 360 / 60
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j = common.floor(lat_ref / d_lat) + common.floor(
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0.5 + ((lat_ref % d_lat) / d_lat) - cprlat
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@ -110,9 +110,9 @@ def airborne_position_with_ref(msg, lat_ref, lon_ref):
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ni = common.cprNL(lat) - i
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if ni > 0:
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d_lon = 360.0 / ni
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d_lon = 360 / ni
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else:
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d_lon = 360.0
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d_lon = 360
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m = common.floor(lon_ref / d_lon) + common.floor(
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0.5 + ((lon_ref % d_lon) / d_lon) - cprlon
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@ -143,9 +143,8 @@ def altitude(msg):
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if tc < 19:
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altcode = altbin[0:6] + "0" + altbin[6:]
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alt = common.altitude(altcode)
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else:
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altcode = altbin[0:6] + "0" + altbin[6:]
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alt = common.altitude(altcode)
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alt = common.bin2int(altbin) * 3.28084
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return alt
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@ -24,7 +24,7 @@ def airborne_velocity(msg, source=False):
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- Angle (degree), either ground track or heading
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- Vertical rate (ft/min)
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- Speed type ('GS' for ground speed, 'AS' for airspeed)
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- [Optional] Direction source ('TRUE_NORTH' or 'MAGENTIC_NORTH')
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- [Optional] Direction source ('TRUE_NORTH' or 'MAGNETIC_NORTH')
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- [Optional] Vertical rate source ('BARO' or 'GNSS')
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"""
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@ -35,29 +35,35 @@ def airborne_velocity(msg, source=False):
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subtype = common.bin2int(mb[5:8])
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if common.bin2int(mb[14:24]) == 0 or common.bin2int(mb[25:35]) == 0:
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return None
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if subtype in (1, 2):
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v_ew_sign = -1 if mb[13] == "1" else 1
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v_ew = common.bin2int(mb[14:24]) - 1 # east-west velocity
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if subtype == 2: # Supersonic
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v_ew *= 4
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v_ns_sign = -1 if mb[24] == "1" else 1
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v_ns = common.bin2int(mb[25:35]) - 1 # north-south velocity
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if subtype == 2: # Supersonic
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v_ns *= 4
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v_ew = common.bin2int(mb[14:24])
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v_ns = common.bin2int(mb[25:35])
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v_we = v_ew_sign * v_ew
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v_sn = v_ns_sign * v_ns
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if v_ew == 0 or v_ns == 0:
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spd = None
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trk_or_hdg = None
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vs = None
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else:
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v_ew_sign = -1 if mb[13] == "1" else 1
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v_ew = v_ew - 1 # east-west velocity
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if subtype == 2: # Supersonic
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v_ew *= 4
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spd = math.sqrt(v_sn * v_sn + v_we * v_we) # unit in kts
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spd = int(spd)
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v_ns_sign = -1 if mb[24] == "1" else 1
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v_ns = v_ns - 1 # north-south velocity
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if subtype == 2: # Supersonic
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v_ns *= 4
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trk = math.atan2(v_we, v_sn)
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trk = math.degrees(trk) # convert to degrees
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trk = trk if trk >= 0 else trk + 360 # no negative val
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v_we = v_ew_sign * v_ew
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v_sn = v_ns_sign * v_ns
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spd = math.sqrt(v_sn * v_sn + v_we * v_we) # unit in kts
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spd = int(spd)
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trk = math.atan2(v_we, v_sn)
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trk = math.degrees(trk) # convert to degrees
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trk = trk if trk >= 0 else trk + 360 # no negative val
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spd_type = "GS"
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trk_or_hdg = round(trk, 2)
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@ -67,13 +73,15 @@ def airborne_velocity(msg, source=False):
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if mb[13] == "0":
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hdg = None
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else:
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hdg = common.bin2int(mb[14:24]) / 1024.0 * 360.0
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hdg = common.bin2int(mb[14:24]) / 1024 * 360.0
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hdg = round(hdg, 2)
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trk_or_hdg = hdg
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spd = common.bin2int(mb[25:35])
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spd = None if spd == 0 else spd - 1
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if subtype == 4: # Supersonic
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spd *= 4
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@ -82,7 +90,7 @@ def airborne_velocity(msg, source=False):
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else:
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spd_type = "TAS"
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dir_type = "MAGENTIC_NORTH"
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dir_type = "MAGNETIC_NORTH"
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vr_source = "GNSS" if mb[35] == "0" else "BARO"
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vr_sign = -1 if mb[36] == "1" else 1
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@ -96,7 +104,7 @@ def airborne_velocity(msg, source=False):
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def altitude_diff(msg):
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"""Decode the differece between GNSS and barometric altitude.
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"""Decode the difference between GNSS and barometric altitude.
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Args:
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msg (str): 28 hexdigits string, TC=19
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