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DRFM Cordic Processor and Sea Clutter Modeling for Enhancing Structured False Target Synthesis

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Naval Postgraduate School Monterey United States

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In this thesis, we investigate two critical components of a digital-image synthesizer electronic warfare architecture that can be used to infuse false targets into high-range resolution profiling radars. The first investigation encompasses the design of an in-phase and quadrature IQ converter based on a CORDIC Coordinate Rotation Digital Computer algorithm. Mathematical modeling is used to examine the accuracy of converting a digitized radar signal IQ sample into a corresponding five-bit binary phase angle. Results obtained from MATLAB show that 18 CORDIC iterations are required to achieve accuracy at 5.625 deg. The resulting design was implemented using the Verilog hardware description language. The second investigation concerns generating sea clutter to impose on the false target. The mean-power return of the sea clutter is calculated using the average power of the radar-cross section derived from the Naval Research Laboratory sea clutter model. The modulation coefficients for the sea clutter were generated using the fluctuating power returns and Doppler spectra generated using a random KA distribution. The coefficients for several sea states were generated using MATLAB. Results show that the correct sea clutter model can effectively add realism to the false target image.

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Technical Report



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Approved For Public Release;

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