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<h1>Radio and Radar Systems</h1>
<h2>Passive Radar: Radio Fence</h2>
<p>The software radio/radar capabilities let us develop flexible and innovative systems. Passive radars use the signal of opportunities to detect the target through multipath. The passive radar concept has helped develop a radio fence, and can work with other applications.
<br><br>Here�s how it works:
</p><br>
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Movement of electrically conductive objects in a radio field changes the phases of radio waves.</li>
<li>
Distributed sensors detect and block fluctuations in these phases.</li>
<li>
Sensitivity depends on the scattered signal from the target.</li>
<li>
The illuminating signal comes from either dedicated transmitters or radio transmitters of opportunity (TV, radio, cellular broadcast towers)</li></ul>
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CRS has demonstrated this technique for HF, VHF, and microwave. Customized systems are provided for various signals and opportunities.</p>
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