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Merge pull request #44 from amhirsch/fix-velocity

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Decoder recognizes supersonic velocity subtype
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Junzi Sun 2019-06-06 11:33:26 +02:00 committed by GitHub
commit 57ad40ec57
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1 changed files with 6 additions and 0 deletions
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pyModeS/decoder/bds/bds09.py
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@ -59,9 +59,13 @@ def airborne_velocity(msg, rtn_sources=False):
if subtype in (1, 2): if subtype in (1, 2):
v_ew_sign = -1 if mb[13]=='1' else 1 v_ew_sign = -1 if mb[13]=='1' else 1
v_ew = common.bin2int(mb[14:24]) - 1 # east-west velocity v_ew = common.bin2int(mb[14:24]) - 1 # east-west velocity
if subtype == 2: # Supersonic
v_ew *= 4
v_ns_sign = -1 if mb[24]=='1' else 1 v_ns_sign = -1 if mb[24]=='1' else 1
v_ns = common.bin2int(mb[25:35]) - 1 # north-south velocity v_ns = common.bin2int(mb[25:35]) - 1 # north-south velocity
if subtype == 2: # Supersonic
v_ns *= 4
v_we = v_ew_sign * v_ew v_we = v_ew_sign * v_ew
v_sn = v_ns_sign * v_ns v_sn = v_ns_sign * v_ns
@ -88,6 +92,8 @@ def airborne_velocity(msg, rtn_sources=False):
spd = common.bin2int(mb[25:35]) spd = common.bin2int(mb[25:35])
spd = None if spd==0 else spd-1 spd = None if spd==0 else spd-1
if subtype == 4: # Supersonic
spd *= 4
if mb[24]=='0': if mb[24]=='0':
tag = 'IAS' tag = 'IAS'