DRFM CORDIC processor and sea clutter modeling for enhancing structured false target synthesis
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Authors
Ang, Pak Siang
Subjects
inverse synthetic aperture radar
sea clutter modeling
CORDIC
Coordinate Rotation Digital Computer
Digital Image Synthesizer
DRFM
digital radio frequency memory
electronic attack
sea clutter modeling
CORDIC
Coordinate Rotation Digital Computer
Digital Image Synthesizer
DRFM
digital radio frequency memory
electronic attack
Advisors
Pace, Phillip E.
Fouts, Douglas J.
Date of Issue
2017-09
Date
Sep-17
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
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 (I/Q) converter based on a CORDIC (Coordinate Rotation Digital Computer) algorithm. Mathematical modeling is used to examine the accuracy of converting a digitized radar signal I/Q 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˚. 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.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
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Format
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Distribution Statement
Approved for public release; distribution is unlimited.
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Copyright is reserved by the copyright owner.