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

Frank H. Sanders; Robert L. Sole; Geoffrey A. Sanders; John E. Carroll

Abstract: NTIA Technical Memorandum TM-18-527 describes procedures for testing the functionality of Environmental Sensing Capability (ESC) sensors that will detect 3.5 GHz radar signals for future spectrum sharing systems. The present document describes additional ESC certification test tasking. The first addition involves (a) examination of ESC behavior in the presence of high-power radar pulses; (b) examination of ESC behavior in the presence of out-of-band radar pulses that coincide in time and frequency with in-band 3.5 GHz radar pulses; and (c) examination of radio frequency (RF) front end filtering characteristics of ESCs. These three observations, which were already included in pre-certification testing, will now be repeated in certification testing so that their results can be included in each ESC’s final certification test report. The second addition is the use of non-linear frequency modulation (NLFM) chirping in lieu of linear chirping for a subset of pulses in Radar Waveform Bins 3 through 5. NLFM chirping has been added to make some of the pulses in those bins more closely resemble pulses that are expected to be used by some future 3.5 GHz radars. The third addition is observation of ESC behavior in the presence of high background noise levels in ESC detection channels.

Keywords: radar; spectrum sharing; spectrum access system (SAS); environmental sensing capability (ESC); dynamic protection area (DPA); non-linear frequency modulation (NLFM); chirping; radar pulses

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

For technical information concerning this report, contact:

Frank H. Sanders
Institute for Telecommunication Sciences
(303) 497-7600

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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