Problemset2-2011 - Principles o f Naval Weapon Systems E...

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ES300 Principles ofNaval Weapon Systems Problem Set 2 -A Y 2011 Section: NAME: -------------,It:---==-- I. Beamwidth, 8, is a function of hich of the following RADAR system characteristics? a. RADAR reflector/linear array size b. RADAR reflector/linear array shape c. Wavelength @ All of the above 2. Concerning RADAR target resolution: o PITFALL PREVENTION Don't confuse range resolution with bearing resolution. If range resolution value increases, does the range resolution pe~r:m ce improve 0 egrade. d. 1Il WEBLINK Antenna: http://www.falstad.com/antcnnaldir ectiolls.html ~e. What does it mean to be able to "resolve" two targets? 10 /~l.( ,J/l'I'/( AI. .+~T, ~: .e, 70 IPfI'l'V ",cy (NO fA-(l6 €'C) Vlee CJ,Nr t/1(l.(5e N"LI!'.,t What are the main determinants to RADAR range resolution? r vtl Y( vJ' V Itt (PvJ) "- P e ~ c. What are the main detetminants to RADAR angul r resolution? 'g,l!J\K vvIV-rH (~J L f K An extended array of dipoles can create better RADAR angular resolution. The AN/SPS-48 operates at 3 GHz. It is 5.3m wide. Calculate its angular resolt tion at 20 km. ). -:. !::- -: !D' n l- ,'- (gq (: I (5,3 0-", POO\ r.: J : '$ n fVV\ If the operating frequency range were adjustable from 2.8 to 3.1 GHz, I. Which frequency would provide the best angular resolution? 1. f ?H:c. 2. Explain your answer. A.f .(: t }. J, ~ e", e~ e t (1\lAp" f2. ell-Iff } . I O. I ~ 3. The directional gain of an antenna is defined by the following ratio: Power per unit of solid angle radiated in a specific direction Power per unit of solid angle that would have been radiated had the same total power been radiated isotropically. o PREVENTION Gain is always output Input In this case it is a comparison of power input to that same power amplified by beamforming and reduced by antenna losses.
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Problemset2-2011 - Principles o f Naval Weapon Systems E...

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