Philip E. Gawthrop and Gary M. Patrick

Abstract: This report examines the potential for ground–based weather radar (meteorological radar) interference to digital microwave systems in the common carrier bands of 3700–4200 MHz and 5925–6425 MHz. Reported cases of interference to microwave common carrier systems from ground–based weather radar systems have increased due to the trend towards digital modulations. Because of this interference, NTIA, the FCC and the National Spectrum Managers Association formed an informal working group to investigate and document the potential problems. The existing and planned spectrum uses by ground–based weather radars and digital microwave systems are addressed as well as regulations and policy pertaining to their electromagnetic compatibility. Methods to mitigate the interference in both the radar transmitter and microwave receiver are also provided.

Keywords: weather radars systems; meteorological aids service; digital microwave systems; electromagnetic compatibility (EMC) analysis; radar spurious emissions; interference mitigation options

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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