Virginia Tech Radio Astronomy Interference Mitigation Project

Playlist available on
Data repository: Repoman-rfcap

Steve Ellingson, Principal Investigator
Mike Buehrer, Co-PI
Jordan Budhu

Collaborators
Sean Hum, University of Toronto

Graduate Students
Trisha Bora (alum)
Joe Esser
William Howard
Xinrui Li
Ramonika Sengupta (alum)
Yugma Bharat Thakore
Alec Yip
Jet Yu (alum)

Undergraduate Research
Tom Anders (alum)
Joe Esser (alum)
Olivia Leonard
Adam Kimbrough (alum)
Alec Yip (alum)

MOSAIC (2024 Undergrad Project)
J. Andrew
K. Klevar
P. Vangumalla

2023 Senior Design Team
J. Daigle
E. Duval
J. Jamison
S. Taliaferro
C. Van Horn

2022 Undergraduate Program
T. Anders
J. Awad
A. Alonso
Y. Dong
J. DiNiso
J. Velasquez

This is: https://ellingsonvt.info/raim/
Last update: August 31, 2024

Here is a snapshot/overview of the entire project as of Jan 2023: Techniques for Observing in the Presence of Satellite Interference (This video necessarily excludes much detail, which can be found below.)

	Interference Canceling for Improved Coexistence Between Passive and Active Radio Systems This work is supported in part by National Science Foundation Grant ECCS-2029948 Introduction Video (YouTube). Now several years old. Poster presented at NSF SWIFT PI meeting, May 13, 2024
	Electronically-Reconfigurable Surfaces for Improved Coexistence Between Radio Astronomy and Satellite Communications Systems This work is supported in part by National Science Foundation Grant AST-2128506 Introduction Video (YouTube). Now several years old. Demonstration of Null Tracking (YouTube) Poster presented at NSF SWIFT PI meeting, May 13, 2024

• J. Budhu, S.V. Hum, S.W. Ellingson, R.M. Buehrer, "Design of Rim-Located Reconfigurable Reflectarrays for Interference Mitigation in Reflector Antennas" IEEE Trans. Ant. & Prop., Vol. 72, No. 4, April 2024, pp. 3736-41. DOI: 10.1109/TAP.2024.3352250. Preprint: arXiv:2305.18199 [eess.SY]. (May 29, 2023; Dec 21, 2023)
• S.W. Ellingson & R.M. Buehrer, "Coherent Time-Domain Canceling of Interference for Radio Astronomy" (2022), Publ. Astron. Soc. Pac., 134, 114505. DOI: 10.1088/1538-3873/ac9b92.
• S.W. Ellingson and R. Sengupta, "Sidelobe Modification for Reflector Antennas by Electronically-Reconfigurable Rim Scattering", IEEE Ant. & Wireless Prop. Let., Vol. 20, No. 6, Jun 2021, pp. 1083-7. DOI: 10.1109/LAWP.2021.3072536. Preprint.

• J. Budhu, S.V. Hum, S. Ellingson, and R.M. Buehrer, "Loading Rims of Radio Telescopes with Reconfigurable Reflectarrays for Adaptive Null-Steering", URSI National Radio Science Meeting, Boulder CO, Jan 2024. DOI: 10.23919/USNC-URSINRSM60317.2024.10464936. Video.
• S.W. Ellingson, R.M. Buehrer, T. Anders, and X. Li, "New Results on Mitigation of Satellite Interference by Coherent Time-Domain Canceling", URSI National Radio Science Meeting, Boulder CO, Jan 2024.
• R. Sengupta & S.W. Ellingson, "Adaptive Antenna Pattern Modeling for Interference Mitigation in Radio Astronomy", IEEE Int'l Conf. on Antenna Measurements & Applications (CAMA), Genoa, Italy, Nov 2023, DOI: 10.1109/CAMA57522.2023.10352823.
• S.V. Hum, S.W. Ellingson & R.M. Buehrer, "Toward Electronically Reconfigurable Rims for Reflectors in Radio Astronomy", URSI General Assembly & Sci. Sym., Sapporo, Japan, Aug 2023.
• S.V. Hum, S.W. Ellingson & R.M. Buehrer, "Reflectarray Concept for Interference Mitigation in Radio Astronomy", IEEE Int'l Ant. & Prop. Sym., Portland OR, July 2023. DOI: 10.1109/USNC-URSI52151.2023.10237818.
• R. Sengupta & S.W. Ellingson, "Effect of Antenna Pattern on Time-Domain Canceling of Interference from Satellites", IEEE Int'l Ant. & Prop. Sym., Portland OR, July 2023. DOI: 10.1109/USNC-URSI52151.2023.10237408.
• R.M. Buehrer & S.W. Ellingson, "Weight Selection for Pattern Control of Paraboloidal Reflector Antennas with Reconfigurable Rim Scattering", IEEE Aerospace Conf., Big Sky, MT, March 2023. DOI: 10.1109/AERO55745.2023.10115669. Presentation.
• S.W. Ellingson & R.M. Buehrer, "Techniques for Observing in the Presence of Satellite Interference", URSI National Radio Science Meeting, Jan 2023, Video.
• R.M. Buehrer & S.W. Ellingson, "Pattern Control for Reflector Antennas Using Electronically-Reconfigurable Rim Scattering", 2022 IEEE Ant. & Prop. Sym., July 2022. DOI: 10.1109/AP-S/USNC-URSI47032.2022.9886543. Video.

• A. Yip, Rim-Mounted Reconfigurable Surfaces for Interference Nulling in Focus-Fed Axisymmetric Reflector Antenna Systems, MS thesis, May 2024, ETD, Video
• T. Bora, Multi-Layered Dual-Band Dual-Polarized Reflectarray Design Toward Rim-Located Reconfigurabable Reflectarrays for Interference Mitigation in Reflector Antennas, MS thesis, May 2024, ETD.
• W. Howard, R.M. Buehrer & S.W. Ellingson, "Open and Closed-Loop Weight Selection for Pattern Control of Paraboloidal Reflector Antennas with Reconfigurable Rim Scattering". Preprint: arXiv:2308.16339, [eess.SP] (Aug 30, 2023; 27 Feb 2024).
• R. Sengupta, Adaptive Pattern Modeling for Large Reflector Antennas, MS thesis, July 2022, ETD, Video
• R. Sengupta & S. Ellingson, "A Fast Approximate Method for Calculating the Gain and Pattern of an Axisymmetric Circular Prime-fed Paraboloidal Reflector Antenna", Tech. Rep., Aug 28, 2021. PDF
• S. Ellingson, "Satellite Tracking Data via the Command Line Interface of PREDICT", Tech. Rep., Aug 15, 2021. PDF
• S.W. Ellingson, "Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis", arXiv:2004.03649 [eess.SP]. (Apr 7, 2020)