Dr. Nate Phillips Profile

Dr. Nate Phillips

at Vescent

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Proceedings Article | 7 June 2024 Presentation + Paper

Ultralow-phase noise microwave generation using photonics for enhanced radar applications

Andrew Attar, Henry Timmers, Bennett Sodergren, Cole Smith, Evan Barnes, Nate Phillips, Kurt Vogel, Kevin Knabe

Proceedings Volume 13048, 130480O (2024) https://doi.org/10.1117/12.3013763

KEYWORDS: Microwave radiation, Radar, Photonics, Oscillators, Global Positioning System, Laser frequency, Synthetic aperture radar, Defense and security, Prototyping, Industrial applications

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Vescent has developed a prototype ultra-stable microwave photonic oscillator capable of advancing the dual DoD and non-DoD needs for alternative positioning, navigation and timing (aPNT), multi-static synthetic aperture radar (SAR), 5G-and-beyond wireless communication, satellite synchronization, and geodetic sensing. Due to shortcomings in sensitivity, dynamic range, and/or resolution, current microwave oscillators for radar limit the identification and tracking of objects with small radar cross sections, including slow-moving objects such as drones. These limitations are dominated by the microwave oscillator phase noise and/or instability. Vescent’s photonic microwave source exploits the method of optical frequency division to transfer the pristine phase noise properties of an ultranarrow linewidth optical laser to microwaves in the L-, C-, or X-band for sensing and imaging. Efforts to improve the long-term frequency stability required in communications and timing synchronization will be discussed. The environmental performance of several key subsystems will also be considered with pathways to reduced size, weight, and power (SWaP). Finally, performance improvements related to the long-term stability of this system will be discussed to simultaneously provide both ultralow phase noise comparable to the best deployable microwave oscillators available and low frequency instability for communication and timing synchronization at a drastically reduced SWaP and environmental susceptibility.

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