Mn: NH V V TINH V DN NG iN TBi tp ln: M phng hin th mc tiu Radar trn mn hnh my tnh PC GVHD: Th.s Nguyn Tng ThnhSVTH: Nguyn Vn ng Dng Thng Hoi L Vit Qun Nguyn Trng V

Ni Dung

I. GII THIU V CHNG TRNH

1. Khi nim Radar:- Radar l h thng thit b tm kim (detect) v xc nh v tr ( ranging) ca i tng thng qua vic thu, pht v x l sng in t.

1.Khi nim Radar:

Phn loi: Ch ng (Active system): thc hin pht, thu v x l sng in t phn x t mc tiu radar B ng (Passive system): ch thu v x l sng in t bc x t mc tiu radar.

2. MC TIU RADAR:- Mc tiu radar l tt c cc i tng c kh nng phn x sng in t nm trong tm pht hin ca trm radar.Phn loi:-Mc tiu quan st:Mc tiu nhn toMc tiu t nhin-Mc tiu gi: l nhng i tng khng cn quan st nhng xut hin trong vng ph sng ca trm radar, gy nhiu i vi cc mc tiu cn quan st

Mc tiu quan st:Mc tiu nhn toMc tiu t nhin Mc tiu gi: l nhng i tng khng cn quan st nhng xut hin trong vng ph sng ca trm radar, gy nhiu i vi cc mc tiu cn quan st Tham s xc nh v tr:3D: M (D, , ) hoc M ( H, , ) trong : H = D sin ()2 D: M (D, ) Qu o mc tiu: tp hp cc v tr ca mc tiu theo thi gian.

NGUYN L C BN CA XUNG RADAR:

NGUYN L C BN CA XUNG RADAR:

rng xung PW- Pulse WidthThi gian bc x tn hiu trong mt chu k bc x.Tn s lp xung PRF - Pulse Repetition FrequencyS xung pht trong mt giy.Thi gian lp xung PRT - Pulse Repetition Time (PRT=1/PRF)PW nh hng n :Phm vi pht hin mc tiu ca RadarC ly ti thiu v ti a c th pht hin mc tiuPRF xc nh: C ly ti a pht hin mc tiu

3.TNH TON C LY:

- Ti trm radar sng in t c bc x ra khng gian, phm vi gim xc ca radar ty thuc vo cng sut ca my pht, khi gp phi vt th l sng in t s b vt th l hp th mt phn,mt phn s b phn x li trm ,tn hiu thu c s c x l bit chnh xc ta cng nh v tr ca vt th trong khng gian

Cc tham s cn xc nh:

4. C S VT L CA RADAR:

Radar lm vic da trn 4 tnh cht ca sng in t:1.Sng in t lan truyn vi vn tc hu hn, khng i c=3.108 (m/s)2. Sng in t truyn thng.3. Nng lng sng in t s phn x khi gp mi trng khng ng nht(mc tiu)4. Tn s thu c ti trm radar sai lch so vi tn s pht, gy nn do s chuyn ng tng i gia mc tiu v trm radar v c xc nh thng qua hiu ng doppler

4. C S VT L CA RADAR:

4. C S VT L CA RADAR:

5. CC BC X L TN HIU RADAR:Bc 1: Pht hin mc tiu:( detection)

Xc xut pht hin nhm: gy nn do tn hiu phn x t cc i tng

Bc 2: o c tham s:( Measurement )- C ly R o tr- o gc (fi,) cn c vo hng tnh ca bp sng radar- o vn tc hiu ng DopperXc nh c v tr v v qu o ca mc tiu Tnh c gia tc ca M

Bc 3: Phn bit mc tiu:( display)

Bc 4: Nhn bit mc tiu: (recorgnation)Ch thc hin c vi Radar ch ng th cp: Radar ch ng th cp l h thng radar c kh nng trao i thng tin ( truyn s liu ) vi i tng (mc tiu) Qu trnh trao i s liu gia M v RS c thc hin khi M nm lt trong bp sng radar. Thi gian trao i s liu ph thuc vo tc qut cnh sng v kch thc bp sng ca trm Radar

Radar th cp truyn cc tn hiu c m ha n b pht p ca mc tiu. Transponder phc p bng bn tin c m ha vi cc thng tin ca i tng ( airplane ) Mt transponder c th thit lp ti a khong 4096 m nhn dng - identifying codes Trong lnh vc qun s , cc transponders c gi l IFF (Identification, Friend or Foe)

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