LOCATING AND REMOVING A PREAMBLE/ASM SEQUENCE IN AERONAUTICAL TELEMETRY
AffiliationBrigham Young University
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AbstractThis paper describes how to locate and remove periodically inserted preamble and ASM bit fields in the presence of the phase ambiguity caused by decision-directed PLLs used in most telemetry demodulators. The phase ambiguity is resolved by correlating rotated or delayed versions of the data with a stored template of the preamble and ASM bits. A finite state machine in conjunction with a FIFO is used to remove the preamble and ASM bits from the output bit stream.
SponsorsInternational Foundation for Telemetering