Fundamentals of radar signal processing mark a. richards

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Transcript of Fundamentals of radar signal processing mark a. richards

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Resolution is the ability of a radar to resolve(distinguish) between two or more targets on the same bearing but at different ranges
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Range cell (or) Resolution cell is smallest range increment the radar is capable of detecting. If the radar has a range resolution of 50 yards and a total range of 60000 yards there are 60000/50=1200 range cells
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Angular Resolution is the ability of the radar system to separate objects at the same range but at slightly different bearings.
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Transmitted power density
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It is a measure of target size as seen by radar
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the RCS of a radar target is an effective area that intercepts the transmitted radar power and then scatters that power isotropically back to the radar receiver.
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The aspect angle is the angle measured from radar antenna to the target path of the object
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The Swerling models are used to describe the statistical properties of the RCS of objects with complex formed surface.
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The Swerling cases I and II applies to a target that is made up of many independent scatterers of roughly equal areas like airplanes. Cases III and IV approximates an object with one large scattering surface with several other small scattering surfaces. This may be the case for ships.
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v/c <<1
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doppler shifts are very small so, doppler radars must employ stable transmitters and receivers
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doppler shift measured from phase shift
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if max phase chnge is less than pi/4 second phase term can be neglected
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The pulse compression ratio is a measure of the degree to which the pulse is compressed. It is defined as the ratio of the uncompressed pulse width to the compressed pulse width, or the product of the pulse spectral bandwidth B and the uncompressed pulse width T. Generally, BT >> 1
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Refer Skolnik
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short, sharp, high-pitched sound
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Refer file available in textbooks folder
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LFM drawbacks
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N=13 13 bit barker code
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