pyModeS.common module¶
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pyModeS.common.allzeros(msg)[source]¶ Check if the data bits are all zeros.
- Parameters
msg (String) – 28 bytes hexadecimal message string
- Returns
True or False
- Return type
bool
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pyModeS.common.altcode(msg)[source]¶ Compute the altitude.
Applicable only for DF4 or DF20 message, bit 20-32. credit: @fbyrkjeland
- Parameters
msg (String) – 28 bytes hexadecimal message string
- Returns
altitude in ft
- Return type
int
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pyModeS.common.crc(msg, encode=False)[source]¶ Mode-S Cyclic Redundancy Check.
Detect if bit error occurs in the Mode-S message. When encode option is on, the checksum is generated.
- Parameters
msg (string) – 28 bytes hexadecimal message string
encode (bool) – True to encode the date only and return the checksum
- Returns
message checksum, or partity bits (encoder)
- Return type
int
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pyModeS.common.crc_legacy(msg, encode=False)[source]¶ Mode-S Cyclic Redundancy Check. (Legacy code, 2x slow).
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pyModeS.common.floor(x)[source]¶ Mode-S floor function.
Defined as the greatest integer value k, such that k <= x For example: floor(3.6) = 3 and floor(-3.6) = -4
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pyModeS.common.hex2bin(hexstr)[source]¶ Convert a hexdecimal string to binary string, with zero fillings.
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pyModeS.common.icao(msg)[source]¶ Calculate the ICAO address from an Mode-S message.
Applicable only with DF4, DF5, DF20, DF21 messages.
- Parameters
msg (String) – 28 bytes hexadecimal message string
- Returns
ICAO address in 6 bytes hexadecimal string
- Return type
String
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pyModeS.common.idcode(msg)[source]¶ Compute identity (squawk code).
Applicable only for DF5 or DF21 messages, bit 20-32. credit: @fbyrkjeland
- Parameters
msg (String) – 28 bytes hexadecimal message string
- Returns
squawk code
- Return type
string
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pyModeS.common.is_icao_assigned(icao)[source]¶ Check whether the ICAO address is assigned (Annex 10, Vol 3).