23773

FED-STD-I037C

rac* way:    Wilhin a building. ah

ehdoiure. /.«.. channel, uied lO contain and prokcl »ir*i. cablei. or bul ban. (I 88)

rack: A frame upon which one or morę un iii of equipm*hl are mouhled. (188) Ncrtc. DODracki are aU>ayi yertical.

rac on: S&e radar beacon.

rad: Acronym far radlatlon absorbed dos*. The baiic unitof meamre for exprening abiorbed radianl ehergy per unii tran of materiał. Nom /. A rad correipondi loan abiorplion of 001 J/kg. ICO ergifg. Notu 2. The abiorbed radianl energy heati. iotii/ei.an^or deit/oyi the materiał upon which it ii incideht

rad.: Abbrcvt<utc?n far radlanfs).

radar: Acronym far radio detectlon and rangtng. I. A radio deleclbn iyilem that tram mili ihorl bunli (puliei) of rf energy ahd delecli their echoi from objecli (largili) luch ai ai rera flor lhipi. Notz. The round-trip propa galion lirre for the echo return may te uiedtodetermire thetarget'1 rangę (diitahos from the radar’i anten na). Tf the tran imitling anten ha hai a narro» beam (the uiual caie), the a/imuth or etevalioh of the largel may alio be determihed. Sywiym prlmary radar. ConJrasi wttk aocondary radar. 2. A radio dekelioh device that providei Information on rangę, a/imuth. and&r elevation of objecti. [JPI] 3. A radiodelermination lyitem baied on the oompariion of referenoe i igrali wilh radio lignali refleckd. or retranimitled. from the poiilion to be delermined. [NTTA] p.R]

radar beacon fracon):    I. A Uanimilter-reoeiver

aiiocialed s>ilh a fi*ed navjgational marle which. »hen triggered by a radar, aulomatica lly return i a diilihctive iignal whichcanappearon thediiplay of the triggerihg radar. providihg rangę, bearing ahd identification ihformation. [NTTA] [RR] 2. A receiyer-tfanimiller combinalion which lendiouta ccded iignal w hen triggered by the proper lype of pulie. enabling dekrminalion of rangę and bearing ihforrtation by the i nter rogali ng itation or aircrafl [JPI]

radar blind rangę: The rangę that oorreipondi to the iiluatioh ih »hich a radar tranimitter ii on ahd hence the receher muit be off, lothat the radarlranimilkd lignaldoei not ialurale./e.. doei not bl ind. i li own reoeiver. Notz. Radar blind rangei oocu; becauie there ii a time inkryal belsv<en tranimilkd puliei that correipondi k> the time rep ui red for a pulie to propagale fc> the objęci, to the largel. and iii refleclbn blrayel back. Thii cauiei an atlemptto meaiure the rangę juit ai the radar tranimitter ii tran imitling the ne*l pulie. Ho»ever. the reoeiverii off. Iherefore thii particular rangę cannol be meaiured The s**dlh of the rangę value that cannol be meaiureddependion theduratbn of the time that the radar reoeiver ii off. which dependi on the duratbn of the tranimilted pulie. The return-lirre inkryal oould be ooincident *.vith the sery rexl radar-tranimitled pulie, the fint pulie follov»ing a tranimilkd pulie. or the leoond. or the third. ahd 10 on. giving riie to a luoceuion of blind rangei. The blind rangei aregiven by r_M- (mcyO/n), where ii the blind rangę fora given value cfm, m ii a poiitive integer that ihdicatei which of the blind rangei ii being determihed, cii the yelocily ofeleclromagnetic s»ave propagation in vacuum (apprcwimalely 3 x U/ mfi)./iithe radar pulie repelilion rak. and a ii the refrailiyeinde^oftheiranimiiiioh medium (nearly I forair). The radar blind rangę ii independenlof the radar radio frepuency (rf)of the radar pulie. [From Weik' 89]

radar blind &p<*d:    The magnitude of the radial

componenl of velocily of an object. t.c.. a target. relatise Ł> a radar lite. that cannol be meaiured by the radaruhil Notz. Radar Wind ipeedi oocui becauie of the relatiomhip betioeen the tranimilted pulie repelilion ratę(PRR)and the reoeiyed pulie-repetilbn ratę. The Doppler pulie repelilion rak ii the differenoe between the tranimilledand receised pulie repelilioh raki. For e*ample. s>hen the object ii itationary w ith reipect to the radar i ile. the reflecled PRR i i the lamę a i the tran i mitled PRR and iherefore a net ./ero iignal ii indcated fer the radial componenl of sebcily. Tf il happem that the DopplerPRR ii the lamę ai the tranimilted PRR. t.c., the illuminating PRR. or il ii a muhipJe of the tranimilted PRR. a/ero iignal ii alioobtained and hence the radar ii blind to theie ipeedi,one foreaeh mulliple of the tram mitkd pulie repetilbn ratę. Tl ii noltheabioluk mągnilude of the ipeedof the object that ii meaiured, bulonly the radial oomponent of the ipeed. The radial

R-1