July 2021 | NTIA Technical Report TR-21-556
Robert J. Achatz; Nicholas Kent; Erik Hill
Abstract: Previously published field test results showed frequent solid state marine radar (SS-MR) interference in magnetron marine radars (M-MRs) at 0.34 nautical miles distance separation and 55 MHz frequency separation. The interference was mitigated but not completely eliminated by increasing distance separation, activating interference rejection (IR), and increasing frequency separation. This report describes a simulation and analysis method that can emulate the field test and uses the method to evaluate the previously published field test results. Results from the method support those of the field test to a large extent although the method results showed more complete mitigation with frequency separation and IR. The field test was performed with a single SS-MR interferer. Legacy M-MR IR may not be as effective in crowded ports or harbors where there are a number of new SS-MR operating nearby. In addition, new SS-MR signals may have higher duty cycles than the ones used here. This method will be an invaluable tool for determining the necessary frequency separation between legacy M-MR and new SS-MR.
Keywords: interference; magnetron; interference protection criteria (IPC); marine radar; radio navigation; radio surveillance radar; solid state marine radar
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Robert J. Achatz
Institute for Telecommunication Sciences
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.