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Millimeter-Wave Angle Estimation of Multiple Targets Using Space-Time Modulation and Interferometric Antenna Arrays

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Document pages: 7 pages

Abstract: A new method of angle estimation of multiple targets using a distributedinterferometric antenna array and wideband space-time modulation is presentedin this work. Interferometric array measurements of angle of arrival aregenerally ambiguous in the presence of one or more targets. We propose a newmethod of mitigating ambiguities in interferometric measurements by multiplyingthe angle pseudo-spectra from multiple antenna baselines, resulting indetections at only the angles of the targets. Using a single linear frequencymodulated (LFM) transmitter and a receive interferometric array with $N$elements we show a simple and computationally efficient technique to estimatethe angle of up to $ mathcal{O}(N^2)$ targets. We describe the theory behindthe technique, present detailed simulations, and an experimental verificationusing a three-element millimeter-wave measurement system.

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