DABS Uplink Coding

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. Tbts report.detaflsthe md~. ttiiques inmrprated intothe D~S upliti ales@. Ju Stti:czcion is givenfor the " " errormntrol metkd selectedti terms of tie lid ~hara~teristi~s " an~ des%c .~~~tra~ts~ Petiormnce results. ticludti intensiveevaluation by simulatio: md bch test, are presentedfor the selectedcode. A btiaw shortened ~clic mde briw 24 r~undantbits WaSselected. Tbe Overhead tie tOtie mde redundancy is mititized by a schemeM wtich theparityheck bits are overlayedon tie discrete address field titieenwded message. This codeis shomtob2ve thecapabili~of protectingaDAOStranspnder from accePtiz merroneousuptik message tithan emor prokbiliv of less tbn 10-7 in. severe interferace e–nrimnment. This same codetiUbe usedin tie D~domli&in a burst eramre correctionmode. Results of theamlysisof thedotii~till appearing separaterewrt. Unclassified Unclassified 42 'ormDOT F 1700.7 (x-72) Reproductionof c.o " ,plcted page a.t)l " r[zc?d