Frank H. Sanders, John E. Carroll, Geoffrey A. Sanders, and Lawrence S. Cohen

Abstract: In response to proposals to introduce new Long Term Evolution (LTE) radio systems into the 3550–3650 MHz (called 3.5 GHz) portion of radio spectrum in the United States, a joint team of National Telecommunications and Information Administration (NTIA) and U.S. Navy electronics engineers performed measurements on the emissions of radars identified as Shipborne Radars 1 and 3 in the NTIA Fast Track Report. These radar types are deployed on many Navy surface vessels. Radar 1 operates in the band of interest; Radar 3 operates in adjacent spectrum. Although intentional Radar 3 emissions are not transmitted in the band of interest, it produces measurable out-of-band (OOB) and spurious emissions in the 3.5 GHz band. In this report, the authors present measured broadband Radar 1 and 3 emission spectra and time domain characteristics. These data encapsulate the OOB and spurious-region signal characteristics that possible future coastal broadband wireless base station receivers may see from these radars’ operations in littoral waters. As such, these data may be used in electromagnetic compatibility analyses for future 3.5 GHz spectrum sharing.

Keywords: electromagnetic compatibility (EMC); spectrum sharing; radar emissions; spectrum monitoring; Long Term Evolution (LTE); NTIA Fast Track Report

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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