Create uplink.py (#55)
First basic functionality for uplink messages - UF and ICAO address.
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pyModeS/decoder/uplink.py
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24
pyModeS/decoder/uplink.py
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from pyModeS.decoder import common
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def uplink_icao(msg):
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"""Calculate the ICAO address from a Mode-S interrogation (uplink message)"""
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p_gen = 0xfffa0480 << ((len(msg)-14)*4)
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data = int(msg[:-6],16)
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PA = int(msg[-6:],16)
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ad = 0
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topbit = 0b1 << (len(msg)*4-25)
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for j in range(0,len(msg)*4,1):
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if (data & topbit):
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data^=p_gen
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data = (data << 1) + ((PA >> 23) & 1)
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PA = PA << 1
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if (j>(len(msg)*4-26)):
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ad = ad + ((data >> (len(msg)*4-25)) & 1)
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ad = ad << 1
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return "%06X" % (ad >> 2)
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def uf(msg):
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"""Decode Uplink Format value, bits 1 to 5."""
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ufbin = common.hex2bin(msg[:2])
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return min(common.bin2int(ufbin[0:5]), 24)
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