Thepaperpresentsanimprovedmethodforthedeinterleavingofradarsignals,basedonatimeofarrivalanalysisandtheuseofthesequentialdifferencehistogram(SDIF)fordeterminingthepulserepetitioninterval(PRI).TheoptimaldetectionthresholdintheSDIFhistogramisderived,whichgreatlycontributestotheefficienc