Specific Emitter Identification Based on a Hybrid Deep Neural Network for ACARS Authentication

Table 1

Character structure of transmission packet in ACARS.

Component	Length	Value
Pre-key	85 ms	All binary “ones”
Bit sync	2 characters	<+> (0x2B), <> (0x2A)
Character sync	2 characters	<+ > (0x2B), <> (0x2A)
Start of header	1 character	<SOH> (0x01)
Text	234 characters maximum	\
Suffix	1 character	<ETX> (0x03) or < ETB> (0x17)
BCS	2 characters	\
BCS suffix	1 character	<DEL> (0x7F)