Lecture_7 - Phased Array Radar NS 212 LT Adam Sheppard...

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Phased Array Radar NS 212 LT Adam Sheppard
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Phased Array The need for increased target handling  capacity is limited by the requirement to  position the radar antenna mechanically Beamforming Reflectors (that we spin around in circles) Arrays 
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Electronically Scanned (Phased) Array What are some limitations to traditional mechanically scanning radars? Time delay in moving the radar beam Mechanical errors / failure Inability to quickly track multiple targets or react to rapid changes in target direction / speed Antenna inertia and inflexibility in beam positioning that slow reaction times Electronically moving a beam offers a solution to all of these, but how can it be done?
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Electronically Scanned (Phased) Array We start by creating a simple “array” where several small radiating elements are positioned adjacent to one another If the waveforms they are producing are in phase with one another, what can be said about the interference pattern between the waves? Max constructive The maximum amount of energy is being transmitted along the axis perpendicular to the face of the array ( boresight axis)
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Electronically Scanned (Phased) Array If we want the beam to point in some direction other than boresight, how do we move it? This is critically important! We have to somehow adjust the phase relationship between the different elements of the array In doing this, we shift the axis of maximum constructive interference (and max energy) to some other direction As a visual example…
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Electronically scanned (phased) array α
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  • Spring '14
  • Array, 0.3m

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