Three-dimensional imaging system employing fast-scanned antenna array
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United States of America Patent
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Sep 17, 2013
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app pub date -
Oct 27, 2010
filing date -
Oct 27, 2010
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Abstract
A phased array antenna includes an array of antenna elements configured to transmit signals that form an antenna beam. A corresponding set of amplifiers supplies a respective set of continuous wave (CW) signals to the antenna elements for transmission. The CW signals having respective different frequencies that are offset from each other by incremental offset frequencies such that the different frequencies are spaced over a frequency range at intervals. Phases of the set of CW signals are aligned such that, at periodic instants, all of the CW signals have simultaneous zero crossings. The frequency and phase relationships among the set of CW signals cause the antenna elements to radiate an antenna beam that scans a field of view in a raster pattern. The resulting ultra-fast scan rate effectively delivers short pulses to any given point within the field of view, making the radiated signal suitable for three-dimensional imaging.
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