March 2016 | Technical Report TR-16-521
Using On-Shore Detected Radar Signal Power for Interference Protection of Off Shore Radar Receivers
Cite This Publication
Frank H. Sanders, Edward F. Drocella Jr., and Robert L. Sole, “Using On-Shore Detected Radar Signal Power for Interference Protection of Off Shore Radar Receivers,” Technical Report TR-16-521, U.S. Department of Commerce, National Telecommunications and Information Administration, Institute for Telecommunication Sciences, March 2016.
Frank H. Sanders, Edward F. Drocella Jr., and Robert L. Sole
Abstract: A spectrum sharing scheme is considered in which ship-based radar stations are operating in the same spectrum band as on-shore communication transmitters, and in which the communication transmitters will cause interference to the radar receivers when interference, I, to noise, N, ratios in the radar receivers exceed a given level (e.g., I/N >= -6 dB). The problem is that on-shore environmental sensing capability (ESC) monitors need to determine whether interference is occurring at off-shore radar receivers based only on information from the radars’ transmitters, with no information available from the victim radar receivers themselves. We describe an on-shore monitoring approach in which the principle of reciprocal propagation between the directions of radar-to-ESC and ESC-to-radar provides a simple go/no-go (single-bit) output from the ESCs to an associated Spectrum Access System (SAS) controlling the communication network, to perform on-shore channel changes for protection of the off-shore radar receivers. The ESC station outputs are based on a power-detection threshold of radar signals at the ESCs (e.g., -64 dBm peak-detected power in 1 MHz bandwidth). Examples are provided in which ship-based radar receivers are protected by a simple algorithm applied to a group of on-shore ESCs and a SAS controller for the terrestrial communication network channel frequencies.
Keywords: radar; radio propagation; antenna gain; spectrum sharing; Spectrum Access System (SAS); Citizens Broadband Radio Service Devices (CBSD); environmental sensing capability (ESC); interference monitoring
For technical information concerning this report, contact:
Frank H. Sanders
Institute for Telecommunication Sciences
(303) 497-7600
fsanders@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.
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.