DESIGN AND PERFORMANCE EVALUATION OF 2D LFMCW FDA

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2021-9-07

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Karadağ, Savaş

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Waveform diversity is a highly desired property for radars because of its numerous benefits. Frequency diversity is one type of the waveform diversity. Total radiation pattern of transmitting antenna elements that are operating at slightly different center frequencies has peaks and nulls depending on the summation of the radiated fields, which can be constructive or destructive with respect to location and time. LFM chirp fed antenna elements with increasing true time delays will give rise to frequency diversity, thus, self-scanning beam patterns. This is named as LFMCW based FDA in the literature. In this thesis, a direction finding method with LFMCW based linear FDA is presented and evaluated. Furthermore, comparison with a proven MIMO example that focuses on advantages of spatially modulated array takes place. It is shown in this study that one can obtain comparable performance by using much simpler LFMCW–FDA implementation than state of the art MIMO implementations which are relatively more complex in structure. Waveform diversity properties and application methods of LFMCW-FDA are both analytically and experimentally proven for radar implementation by [1]–[5]. All of them utilized the linear array until now. In this study, a novel implementation with a planar antenna array is introduced. Migration to planar array makes 3D scanning possible with this technic. The proposed structure is evaluated by simulations of a realistic radar example. Finally, the target RCS characteristic of the planar array is investigated and compared with the equivalent PA radar.

Subject Keywords

Frequency Diverse Array, Phased Array, LFMCW, Radar Cross Section

URI

https://hdl.handle.net/11511/93099

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Karadağ, “DESIGN AND PERFORMANCE EVALUATION OF 2D LFMCW FDA,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.