The Spectrum Sensing and Noise project aims to advance fundamental metrology of microwave thermal noise together with applied metrology for spectrum sensing and assessment. Noise metrology has been an established research area of research at NBS and NIST in Boulder since the beginning at the Central Radio Propagation Laboratory.
Reports in the NIST Technical Notes series were extensive measurements of radiated noise. Researchers also made key early contributions to standardizing guided-wave noise measurements in microwave systems. These contributions continue to underpin our ongoing work, but basic applications and hardware capabilities have outpaced progress in the noise metrology discipline, leaving significant opportunities for new research with substantial impact. Current capabilities include theory and practice of guided-wave, radiated, and cryogenic noise at various frequencies from 30 MHz to 110 GHz. To use this to support predictive capability in crowded spectrum problems, we have begun an extensive research effort to extend this metrology into the system's domain. This means relating physical conditions to other spectrum activity, impacts on users, and behavior in practical environments. These research efforts fall within the following CTL focus areas: