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Proceedings Paper

Code-modulated interferometric imaging system using phased arrays
Author(s): Vikas Chauhan; Kevin Greene; Brian Floyd
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Paper Abstract

Millimeter-wave (mm-wave) imaging provides compelling capabilities for security screening, navigation, and bio- medical applications. Traditional scanned or focal-plane mm-wave imagers are bulky and costly. In contrast, phased-array hardware developed for mass-market wireless communications and automotive radar promise to be extremely low cost. In this work, we present techniques which can allow low-cost phased-array receivers to be reconfigured or re-purposed as interferometric imagers, removing the need for custom hardware and thereby reducing cost. Since traditional phased arrays power combine incoming signals prior to digitization, orthogonal code-modulation is applied to each incoming signal using phase shifters within each front-end and two-bit codes. These code-modulated signals can then be combined and processed coherently through a shared hardware path. Once digitized, visibility functions can be recovered through squaring and code-demultiplexing operations. Pro- vided that codes are selected such that the product of two orthogonal codes is a third unique and orthogonal code, it is possible to demultiplex complex visibility functions directly. As such, the proposed system modulates incoming signals but demodulates desired correlations. In this work, we present the operation of the system, a validation of its operation using behavioral models of a traditional phased array, and a benchmarking of the code-modulated interferometer against traditional interferometer and focal-plane arrays.

Paper Details

Date Published: 12 May 2016
PDF: 8 pages
Proc. SPIE 9830, Passive and Active Millimeter-Wave Imaging XIX, 98300D (12 May 2016); doi: 10.1117/12.2234758
Show Author Affiliations
Vikas Chauhan, North Carolina State Univ. (United States)
Kevin Greene, North Carolina State Univ. (United States)
Brian Floyd, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 9830:
Passive and Active Millimeter-Wave Imaging XIX
David A. Wikner; Arttu R. Luukanen, Editor(s)

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