Philip Lundrigan, Karl Warnick, Deukhyoun Heo


Driven by expanding scientific questions in cosmology and astrophysics and advances in receiver technology, passive radio astronomy observations now take place over the entire radio spectrum. Active wireless services, including 5G cellular networks, are increasing in spectral occupancy from L band to K band and beyond. Observatories need more options for RFI mitigation to improve cooperative use of radio spectrum. The project addresses the technological needs at multiple layers of the passive/active spectral user cooperative space, including dynamically tunable notch filters, analog true-time-delay spatial processing, and passive-aware active user network protocols. This multi-tier approach enables better protection of passive users from interference and more efficient use of the radio spectrum.