Weapons - Principles o f Naval Weapon Systems S300 P roblem...

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£S300 Principles ofNaval Weapon Systems Problem Set 1 - AY 2011 j(ey Section: _ NAME: I. Frequencies from 100 MHz to 20,000 MHz are generally used in RADAR applications. Calculate the -f wavelengths associated with this range of frequencies. Record your answers in the table. C C ;xro( ~ 6 -;. ().6{C;~ -;: _ = C -: - ~ "oJ' 3""" )-. -:: f7 0 iJ c> lL (0 I -r (Df If) -z, , Frequency Wavelength (m) 100 MHz 3...... , 20,000 MHz o . 0 I (;" "'" 2. Match the wave propagation phenomena with the correct definition. l33 WEBLINK Refraction/Reflection Applet: i.J.UD:i/www.walter- fendl.de/ph 14e/huvgCl1spr.htm 333 Diffraction Applet: hUI1)/\\·\\ \\ .n!!Sir.nellirllls.wml Ilgl ish IHm/DI fIi·act ion3. hun A change in direction of an EM wave caused by a change Reflection A. in the speed of propagation in a medium. A change in direction of an EM wave caused by the wave's encounter with a conducting surface such that the change in Refraction B. direction is equal to the angle incident to the perpendicular of the conducting surface. Diffraction C. A change in direction of an EM wave caused by an obstruction in the wave's path. 3. The Airborne Laser Mine Detection System (ALMDS) is designed to detect, classifY and localize floating and near-surface moored mines. The ALMDS is integrated into the MH-60S helicopter to provide a rapid wide-area reconnaissance and assessment of mine threats in littoral zones, confined straits, choke points and amphibious objective areas. The ALMDS uses pulsed LASER light and streak tube receivers housed in an external equipment pod to image the entire near-surface volume potentially containing mines. Knowing that the index of refraction of air is I and the index of refraction of water is 1.33: a. What is the angle of refraction seen when an ALMDS LASER beam enters water at an angle of incidence = 15°? Alit V\>/II\. I :::Ov\'l,.'5;v\ e l- II. 2 0 V\ ,"'; \ ! J; \ S- ~ {. ,3 'S j"," ()"}, b. Draw and label the ALMDS beam refraction scenario: o PITFALL PREVENTION b. Don't confuse wave propagation phenomena with energy "losses" (also known as attenuation or propagation c.
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Weapons - Principles o f Naval Weapon Systems S300 P roblem...

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