Tuyen tap bao cao khoa hoc Hdi nghi Khoa hgc ky thuat Do ludng toan qudc Idn thfl IV Hd Ngi, 11 - 2005 4TINH TOAN VA MO PHONG TREN MAY TINH DONG HOC DIEU KHIEN CUA HE TLT DONG BAM TIN HIEU GOC TRONG DA! RADA Le Chung Hgc vien Ky thudt Qudn sif Nguyin Bdc Thdng Trung tdm Khoa hgi ky thudt - Cdng nghe Qudn Sif Tdm tdt: Bdi bdo trinh bdy vi mot plufffng phdp tong hgiJ cd'u true cho he tif ddng hdm tin hieu gdc ddi Rada nhdm ddp dug i di yeu cdu ddc biet cua logi he thd'ng bdm ndy Ke't qud i lia phitaug phdp long hgi) he hdm gdc ddi rada dd dugc kiem chifng bdng md phong tren mdy tinh I DAT VAN DE Hfi thd'ng tu ddng bam tin hifiu gdc dai Rada boat ddng theo nguyen tdc dua vao vific so sdnh gia trj thuc cua toa dfi gdc muc tieu vdi hudng can bdng tin hifiu (hudiig cue dai ciia cdnh sdng anten) Bai bao trinh bay vfi mfit phuong phap tifi'p can dd tdng hgp cdu true cho he tu ddng bdm tfn hifiu gdc dai Rada, nhdm dap utig cac yfiu cau ddc bifit va gdp phdn xdy dung phuong phdp tinb todn ddng hgc didu khidn cua hfi thd'ng tu ddng bam tin hifiu gdc muc tifiu II TINH TOAN DONG HOC CUA HE TUDONG BAM TIN HIEU GOC Di tdng hgp hfi tu dgng bam cd thd dung mdt sd phuong phap khac [1,2,3,7] nhdm dat dugc cdc yfiu cdu vd chi tifiu chd't lugng cua he thdng trang thai qua va trang thdi xac ldp, yfiu cdu vd tinh dieu khien dugc, quan sat dugc Dd'i vdi bfi thd'ng bam tin hifiu gdc ddi Rada, ngudi la quan ldm nhifiu tdi vific giam sai sd cua he thd'ng trang thai xac lap Sau ddy se trinh bay mdt sd ndi dung nham thuc hien muc dfch dd'i vdi he thd'ng L Lira chgn bac phiem tinh Tfn hifiu dau vao cua he tu ddng bdm gdc chfla thdng tin vd toa dd gdc muc tifiu, dflgc tao dua tren co sd tin hifiu phan xa Tin hifiu la tin hifiu bifi'n ddi chdm vi bi ban chfi' bdi kha nang co ddng cua muc lieu [2,5] Vi vay dd dam bao chd't Iugng bam sat, hfi thdng tu ddng bdm gdc muc tifiu ciia dai Rada ihudng la he thd'ng phifi'm tinh bdc nhd'l [4,5] Khi hfi thfi'ng chiu tac dfing bdi cdc tfn hieu bifi'n doi chSm thi ngudi ta thudng kd tdi sai sd V 2a theo tdc dd AXy = — va cd sai sd iheo gia td'c Ax^ = — ; dd v la tdc ciia tfn hifiu K K ddu vao ; a la gia td'c bie'n thifin cua tin hieu ddu vao va K la hfi sd truydn mach hd cua he Ihdng Trong he thdng tu ddng bam gdc dai Rada, hfi sd tmydn mach hd K thudng dugc chgn kha \dn Vi vdy, sai sd theo td'c dd va theo gia td'c thudng cd gia tri nhd Di hfi Ihdng la he phie'm tmh bdc nhd't, cd the chgn dang dac tfnh bien dd tdn sd Idgaril L(to) cua hfi thd'ng hd [1,2,3,4] Khi chgn dang dac Ifnh bien dd tdn sd Idgarit cua he Ihdng Ihi khdng nhflng cdn thoa man yfiu cdu ve dd chinh xac cua he thdng dfldi lac ddng ciia tin hifiu dieu khidn, ma cdn cdn liru y dap flng dugc yeu cdu vd dd du trfl dn djnb, ve cdc chi lieu chd'l lugng cua he thd'ng trang thai qua dd (nhu thdi gian qua dd, qua dieu chinh) va kha nang Igc nhifiu ciia he Ihdng v.v [1,3,5 ] Chgn so dd ca'u true ciia be thdng ta dgng bam tin hieu goc muc tieu So dd cd'u true be thdng tu dgng bam gdc muc tieu dugc chgn [2,5,6 ] cd dang hinh I AtrTr-V''i'>''i ^ M ^ t^bph Un j KHCNT(P) | — » | KCH(P) Hmh L So cau true cua he ttr ddng bam gdc dd: t^ - Lugng vao cua hfi thd'ng lu ddng bam gdc ty - Lugng ciia hfi thd'ng tu ddng bam gdc + OQ (t) - Tac ddng su thang giang bien dd cua tin hieu phan xa &ij{t) - Tac ddng nhifiu loan Kt,ph - He sd truyen cua bfi phan phdn biet thdi gian KHCNT(P) " Ham sd truydn cua co ca'u hieu chinh nd'i tifi'p KCH(P) - Ham sd truydn cua phdn tfl chd'p hanh Ddi vdi hfi thdng nay, chu ky quel T^ cua cac xung gdc cua canh sdng anten cd gia tri rd't nhd (T^ « Is), nfin cd thd sfl dung phep xap x i : n (I) Sau hgp nhd'l cac khdu ndm sau bd phdn biet vao phdn chd'p hdnh, se cd ham sd truydn ciia phdn tfl chd'p hdnh: K,„(.P) _K,„(\ + T,p) p(\ + T,p) Trong dd: K^H hfi sd truyen ciia phan tfl chap hanh T, va T, - cac hang sd thdi gian (2) III LUA CHON CAC THAM SO CHO HE BAM TIN HIEU GOC TRONG DAI RADA Vific lua chgn cac Iham sd cho hfi thd'ng tu ddng bam gdc cdn dua vao cac chi tifiu chd'l lugng yfiu cdu dd'i vdi qua trinh dieu chinh cua he Ihdng nhu thdi gian qua T , dd qua dieu chinh cue dai a^ax ' s^' so bam sdt cho phep v.v nhu da ndi tren Trong thuc t^, dd'i vdi cdc muc lifiu la thie't bi bay cd ngudi ldi thi su bie'n thifin toa gdc d ddu vao he bam gdc [3,5] thudng khdng qua 2[°/s] Yfiu can vd dd chinh xac xac dinh toa dd gdc che' dd xac ldp d chfi' dd tu ddng bam sat la khdng qua 1,5 phut gdc, nghia la sai sd theo td'c dd d chfi dd xac ldp l^ < 1,5 Ngoai ra, dd he tu dfing bam gdc dam bao yfiu cdu ve tdc ddng nhanh, Ihi b ddy cd thd chgn thdi gian qua dd cho phep T^^ = (0,55 -r 0,65)[s] va dd qud dicu chinh cue dai (7ynz\ - (20 "=" 30)% De dap flng cdc yfiu cdu ddc biet ciia hfi thdng tu ddng bam gdc dai Rada,[l,3 5] cd thd chgn dac tfnh tdn sd bifin loga mach hd mong mudn Lm(o)) cd dang hinh A Lm((i)) [dB] Igra [1/s] Hinh Dac tinh bien tan sd loga mong muon Dat u = t,, y = t, va chgn cac tham bie'n trang thai x, = y, x, = >•, x,= y tuong ung se nhan dugc phuong trinh trang thai cua he thong kfn mong mud'n co dang: X = AX + BU] (3) Y = CX I 0 (4) c=[b, b, 6„: (5) l + KT, Trong dd: T,T, TJ, 0; * TJ TJ, K - He so' truyen ciia he thd'ng hd mong mudn Dua vao ydu cau cha't lugng ddi vdi he thd'ng tu ddng bam gdc muc tidu dd'i vdi mdt loai dai Rada, se xac dinh duoc cac thdng sd: K = 100, Tl = 0,81 s, T2 = 0,135 s, T3 =0,015 s IV MO PHONG DONG HOC DIEU KHIEN CUA HE TU DONG BAM GOC MUC TIEU Sir dung phan mem cdng cu Matlab d^ md phong he tu dgng bam gdc muc tieu ddi vdi mdt loai dai Rada cd so dd e4'u true (hinh 1) va phugng trinh trang thai ciia he thd'ng kfn mong mud'n (3), vdi cac thdng sd K = 100, T, = 0,81s, T, = 0,I35s, T, =0,OI5s; se cd: + Sg dd md phdng he tu dgng bam toa gdc muc tieu dai rada (hmh 3) + So dd md phong tao gia quy dao muc tieu mat phang ngang (hinh 4) + So dd md phong he tu dgng bam toa dd gdc che'do bam sat (hlnh 5) + Dac tfnh qua ciia he tit ddng bam tfn hidu gdc dai radar (hlnh 6) Hinh So dd mo phdng he tu dpng bam toa goc muc tieu dai rada H—1|^ H "' I L—' [^AritdidDiiDBtie ti>iri MiK ipTWyS fiV-i-*L_rtr' Hinh So d6 tao gia quy dao muc tieu mat phang ngang (tuong tu ddi vdi mat phSng dflng) H imuwi Tnuitrtn , ^-^^Hi}* "^ IL>J CD- mrinJ —KD IjJSifiillbinslirIi j„,„f„ I