Emerging Technologies Track
11:00 -12:00
"Scanning Optimized Aperiodic Linear Arrays"
Dr. Paul Garrison
Lockheed Martin Aeronautics Company
Aperiodic linear arrays are arrays with randomly spaced elements whose locations are determined by some optimization objective, but the elements in general do not fall on regular lattice locations. Scanning optimized Aperiodic Linear Arrays (APLA) can be problematic when the optimized arrays include inter-element spacing exceeding a half wavelength. When the optimized arrays are scanned, high side lobes and grating lobes will likely appear. This paper will present a change in the optimization domain that allows optimized APLA’s to be scanned without the appearance of grating lobes. The new approach is independent of the optimization method employed.
First, linear array basic concepts are presented followed by the general array factor for equal-amplitude array elements. Then, the general array factor for amplitude weighted array elements is presented along with a discussion of Dolph-Tschebyscheff arrays. Aperiodic Linear Arrays (APLA) are introduced along with expressions for the array factor, mean sidelobe level, and variance. APLA optimization approaches, including a new approach, are presented, concluding with examples of APLA’s and comparisons with Dolph-Tschebyscheff arrays.
About the Speaker
Dr. Paul E. Garrison is a Systems Engineer Principal at Lockheed Martin Aeronautics in Fort Worth, Texas. He is currently the lead for Validation and Verification of the F-35 Integration and Test Laboratories. He graduated with B.S. and M.S. degrees in Electrical Engineering from Texas Tech University in 1976 and 1978, respectively. The title of his thesis was UHF Propagation via Transponder. In 1998, he earned a Ph.D. in Electrical Engineering from the University of Texas at Arlington. The title of his dissertation was The Design and Evaluation of Aperiodic Linear Arrays of Few Elements. Dr. Garrison joined Lockheed Martin Aeronautics, formerly General Dynamics, in 1979 and has worked on a variety of programs with an emphasis on radar, communications, real-time, real-frequency radar simulation, and real-time real-frequency angle of arrival simulation systems.
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