Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Robert J. Achatz; Paul M. McKenna; Roger A. Dalke; Nicholas DeMinco; Frank H. Sanders; John E. Carroll

Abstract: Spectrum reallocations may place broadband radio services (BRS) near spectrum used by 2900–3100 MHz band marine radars. Interference effects from these reallocations include unwanted emissions in the radar detection bandwidth and front-end overload. This report provides background information for subsequent reports that analyze these effects. Interference protection criteria (IPC) are identified, an interference scenario is described, and models for the radar system, BRS system, radar target, and radio wave propagation are presented. The BRS signal is shown to be reasonably emulated by Gaussian noise. A method for determining the aggregate power distribution using a realistic propagation model and Monte Carlo analysis is described. The aggregate power from the base stations was found to be as much as 6 dB more than power from a single base station. Finally a method for incorporating a variable SNR, caused by variable radar to target path loss, into interference analysis is shown.

Keywords: radar; interference; radio wave propagation; front-end overload; unwanted emissions; interference protection criteria (IPC); aggregate power; broadband radio service; marine radar; radio spectrum engineering; signal characterization


To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
lsegre@ntia.doc.gov

For technical information concerning this report, contact:

Robert J. Achatz
Institute for Telecommunication Sciences
(303) 497-3498
rachatz@ntia.doc.gov


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.

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