GPS接收机的自适应门限设定方法(英文).pdfVIP

第 30 卷 　第 2 期 电 子 器 件 Vol. 30 　No . 2 2007 年 4 月 　　　 Ch inese J ou r nal Of Elect ro n D evices 　　 Ap r . 200 7 3 Novel Ada pt ive Thr eshol d et t in g Algor it h m for GP Receiver GU A N X ua n , BA Xi a o2hui , M U R on g2z en g , C H E N G Ya2qi , C H E N J ie ( In st it ute of M ic r oe lec t r oni cs , Chin ese A c a demy of ci en ces , Be ij in g 100029 , Chi n a) Abstr act :Th e ai m of t his pap er i s t o p r e se nt a novel t h r esho ld set ti ng al gor it h m by which bot h t h e fal se a2 larm r ate and t h e p robabili ty of det ect io n coul d be kep t const an t in a r an ge while t he N R of r eceived sig2 n al s va rie s. Wh at make s i t differ ent fr om t he former adap tive t h r esho ld set ti ng rule s is t hat it i s not based on t he conven tional CFA R cr it erion bu t on a novel con sta nt e quivalent si gnal t o noise r atio ( CE N R) cr it e2 r ion. i nce only when t h e out p u t N R i s constan t can t he p r obabilit y of d et ection be kep t st able alon g w it h a desir ed fal se alar m r ate , t he goal of t he t h reshol d det ector i s to main tain a con st ant out p ut N R by usi ng t h e non2coher en t combi nation . On one side , t he adap tive t hr esho l d is set as a f unction of t he esti mated no ise p ower , t h us guar ant ee t he accumu lated outp ut t hat exceed t he t hr eshol d woul d r each a r equi red re2 sult in g si gnal to noi se r at io . On t he ot her si de , t he n u mber of t est ed sa mp les i s adap t ively adj u sted , which mean s , t he in tegrat ion t ime is i ncr ea sed unt il t he non2cohe