Decoder recognizes supersonic velocity subtype
If the aircraft velocity message indicates a supersonic subtype (2 or 4), multiply the derived velocity by four. This is in accordance with Table A-2-9[a, b] in the "Technical Provisions for Mode-S Services and Extended Squitter"
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@ -59,9 +59,13 @@ def airborne_velocity(msg, rtn_sources=False):
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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_we = v_ew_sign * v_ew
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v_sn = v_ns_sign * v_ns
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@ -88,6 +92,8 @@ def airborne_velocity(msg, rtn_sources=False):
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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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if mb[24]=='0':
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tag = 'IAS'
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