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Clarifications of Skysense format

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This commit is contained in:
Magnus Lundmark 2019-01-22 09:44:58 +01:00
parent c252647e77
commit 3f6389a67d
1 changed files with 6 additions and 16 deletions
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22
pyModeS/extra/tcpclient.py
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@ -151,13 +151,7 @@ class BaseClient(Thread):
----------------------------------------------------------------------------------
Position: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
----------------------------------------------------------------------------------
Example: 24 8d 4c a5 c0 20 24 22 f1 28 38 20 f3 24 04 be 8d 0d d8 e0 80 66 ed b9
24 8d 4a b5 68 99 10 6f 13 90 40 93 7f 9f 61 2f 1d b7 5b 46 e0 98 4a c8
Example: 24 5d 3c 48 c8 ad 3d f9 00 00 00 00 00 00 00 be 8d 66 c4 c5 7c 4c d7 2d
24 5d 4a b5 68 88 90 db 00 00 00 00 00 00 00 2f 1b 1e eb 80 ad 9a 9a 75
SS field - Start character
Position 0:
1 byte = 8 bits
@ -168,7 +162,6 @@ class BaseClient(Thread):
14 bytes = 112 bits
Mode-S payload
In case of DF types that only carry 7 bytes of information position 8 through 14 are set to 0x00.
Decoding of payload information is not within the scope of this document.
TS field - Time stamp
Position 15 through 20:
@ -183,8 +176,7 @@ class BaseClient(Thread):
Bits 46 through 30 - 17 bits
Nanoseconds into current second, between 0 and 999999999
Bits 29 through 0 - 30 bits
Bits 29 through 0 - 30 bits
RS field - Signal Level
Position 21 through 23:
@ -202,11 +194,11 @@ class BaseClient(Thread):
SS_MSGLENGTH = 24
SS_STARTCHAR = 0x24
if len(self.buffer) < SS_MSGLENGTH:
if len(self.buffer) <= SS_MSGLENGTH:
return None
messages = []
while len(self.buffer) > SS_MSGLENGTH + 1:
while len(self.buffer) > SS_MSGLENGTH:
i = 0
if self.buffer[i] == SS_STARTCHAR and self.buffer[i+SS_MSGLENGTH] == SS_STARTCHAR:
i += 1
@ -217,14 +209,13 @@ class BaseClient(Thread):
#Short message
payload = self.buffer[i:i+7]
msg = ''.join('%02X' % j for j in payload)
i += 14
i += 14 #Both message types use 14 bytes
tsbin = self.buffer[i:i+6]
#print(tsbin)
sec = ( (tsbin[0] & 0x7f) << 10) | (tsbin[1] << 2 ) | (tsbin[2] >> 6)
nano = ( (tsbin[2] & 0x3f) << 24) | (tsbin[3] << 16) | (tsbin[4] << 8) | tsbin[5]
ts = sec + nano*1.0e-9
i += 6
#Signal level - Don't care
#Signal and noise level - Don't care for now
i += 3
self.buffer = self.buffer[SS_MSGLENGTH:]
messages.append( [msg,ts] )
@ -277,7 +268,6 @@ class BaseClient(Thread):
print("Unexpected Error:", e)
if __name__ == '__main__':
# for testing purpose only
host = sys.argv[1]