&lt;title&gt;Superresolution precision direction-finding techniques and measurements&lt;/title&gt;

Levitt, Hal L.; Alexander, Edward M.; Tse, Anthony Y.; Spezio, Anthony E.

doi:10.1117/12.212033

Cited by 2 publications

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“…A laser is split between two Bragg cells whose outputs are Fourier transformed by a lens and detected by a channelized phase detector. 11 An alternate approach to measure the direction of arrival (DOA) for a radiofrequency (RF) signal uses two cascaded MZMs biased at the minimum transmission point to suppress the optical carrier wave. Identical RF signals with a given phase shift are applied to the electrode of each MZM.…”

Section: Introductionmentioning

confidence: 99%

Wideband direction finding using a photonic robust symmetrical number system technique

et al. 2014

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Abstract. Dual electrode Mach-Zehnder modulators (DE-MZMs) are used to conduct phase detection for direct wideband direction finding (DF) of microwave signals. It is demonstrated theoretically and through simulation and experimentation that the normalized magnitude of the output signal phase detector circuit is equal to j sinðψ∕2Þj, where ψ is the phase difference between the plane waves arriving at the reference and measurement antennas of a linear DF array. A four-element wideband photonic DF system with robust symmetrical number system preprocessing is presented. Simulation and experimental testing results are provided to demonstrate the theoretical concept. The results demonstrate a direct DF receiver using DE-MZMs that achieves fine angular resolution using a much smaller array size than is typically required for linear arrays employing super-resolution signal processing techniques.

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Section: Introductionmentioning

confidence: 99%