188宝金博页面版

Science in China Series F h,formation Sciences ◎ 2009 S C IE NC E lN C HINA P R ES S Springc r H P R F p u lse D LO NG Teng & R E N L iX iang t o pp le r st e pp e d w w w ． scic hina． c om info ． s cic hjna． co m w w w ． spring erlink ． co r n f re q ue nc y ra da r Radar Research Lab， Sc hool of Information and Electronics ， Beijing lnstitute of Technology, Beijing 1 00081， C hina Stepped frequency radar is a well known s cheme to generate high range res olution profile (HRRP) of targ ets ． T h ro u g h ap p rop riate ra d ar p a ra mete r d es ig n ，th e ra da r en a bles b oth u na mb ig u o us v elo c ity meas u re me nt an d hig h res o lutio n ran g in g w ith in a s ing le d we ll in a h ig h p u ls e re petitio n f re q ue nc y (HPRF) mode． T his paper analyzes in detail the design principle of the HPRF stepped frequency radar s y s te m，th e s o lu tio n to its a mb ig u ity is s u e ， as we ll a s its s ig n al p ro c es s in g me th od ．B oth the o retic al a na ly s is a n d s im ulat io n re s u lt s d em o ns t rate th at t he p ro p o s ed rad a r s c h em e c a n w o rk in de pe n de nt ly to s o lv e th e p ro b le m of mo tio n c o mpe ns atio n ， a nd is the refo re hig h ly a pp lic ab le to m any ne w ty pe s o f rad ar D FT, HP R F, p ulse Do pp le r ra da r, ste pp ed freq ue ncy rada r 1 Int ro d uc t io n T he stepped f r equency (SF ) radar is a kind of high range resolut ion fHR R ) radar．It t ransmits a se— ries of nar row ba nd pulses．wh ich a re stepped in frequency from p ulse to p ulse a nd form a burst that covers a w ide ba ndw idth ． SF ra dar requires only a narr ow instanta neous receiver b andw idth and hence can tre m endously reduce sy stem cor n — p lex ity a nd cost ． F ig ure 1【 1 J show s a schem atic di agra m of an SF ra dar sy stem ． H ow ever ，S F ra dar has the disadv ant ag e of b e— ing very sensit ive to targ et mo tio n，w hich resul ts in t arg et r ange shif t a s w ell a s echo spr ead in its H R R P so m otion com pensation is needed f o r m ov - in g t arg et p r o cess in g [ 一 ．T radit ional ly S F rad ar does m ot ion co m pensatio n wit h ta rget ve lo city in— form atio n obt ained unde r a narr ow— ba nd w or king R ec e iv ed J u ne 2 3 ， 2 0 0 8 ； a c ce pt e d F e b rua ry 1 0 ，2 0 0 9 doi：10． 1007／ sl 1432— 009— 0087— 8 Corresponding author (emaih lix iangr~ bit ． edu． cn) S upp ort e d by t he f un d of N a t iona l D e fe nse I ndu st ry I nn ov a t i ve T e a m m ode of t he r ada r or froln outside，w hich m ak es the ra dar sy stem fail to w or k indep endent ly． T he r esear ch r esults of th is pa per show s that ， in the H P R F m o de ．thro ug h car eful cho ice of r ada r design p ar am eters，S F r ad a r can a chieve b oth un— am big uo us veloc ity m ea s urem ent a nd hig h rang e resolution i n a sing le dw ell or burst ．w hich en— a bles th e in dep endent oper ation of t he r ada r ．F or SF r ada r ，the choice of sign al processing m et h— ods is a lso im p or tant for ra dar p er form a nce ． S F ra dar usua lly adop ts ID F T m et hod to obta in t ar— get H R R P 【 5 J．an d a lterna tively it ca n also adopt D F T m ethod ． In this ea s e．the S F r ada r can be seen a s a pulse Doppler stepped f r equency (PD SF) r ada r ． T he concept of H P R F SF r adar wa s f i rst dev el— op ed by M yers in 199 6 1 6,7】，w it h a sp ecif i c i mp le— lCitation： Lon gT， RenL x_HPRFpu lseDop ple r ste pp edfreq u en cy rad ar． SciChin aSe rF— InfSci； 20 09， 52(5)： 883 L89 3， d oi： 10． IO 07／ S11 432 一 』O 09 l -0087 8