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lotter on DSK11XQN23PROD with PROPOSALS1

Federal Register / Vol. 86, No. 158 / Thursday, August 19, 2021 / Proposed Rules example, could the Commissions rules be modified to allow an aircrafts entertainment systems in-seat display monitors to incorporate radars that could be controlled remotely by air travelers gestures? Commenters addressing expanded airborne use should provide detailed technical analyses, research, studies, etc.
supporting potential recommendations to address whether harmful interference to authorized users in the band would result or if such systems can coexist and under what conditions. Would any adverse effects be anticipated from 60
GHz radars operating on aircraft? Would the risk of harmful interference occurring to passive EESS be minimal from radars in aircraft with high RF
attenuation characteristics? What are the cost and benefits of such use?
In addition, the Commission seeks comment on the ramifications of permitting unlicensed 60 GHz radar operation on board aircraft with little or no RF attenuation characteristics, such as unmanned aerial systems UAS/
drones and light and personal aircraft.
The Commission has given a limited waiver to Leica Geosystems AG to operate a radar in the 6064 GHz band on board a UAS to provide visual inspection of structures in engineering and scientific applications to prevent the UAS from colliding with the structure or other fixed objects that it is surveying. The Commission has also received informal inquiries indicating an interest in deploying unlicensed 60
GHz radar for applications involving, as an example, use on board crop-spraying aircraft. Commenters who support expanding the types of aircraft upon which unlicensed 60 GHz devices could be deployed should address how such use would not undermine the objective of preventing harmful interference to EESS operations in the 5759.3 GHz portion of the band.
Compliance testing of modulated CW
e.g., FMCW and pulse/impulse-based radar devices can be complex and typically requires careful consideration to ensure the proper characterization of technical parameters such as transmit bandwidth, output power and unwanted emissions levels in the out-of-band and spurious domains. As such, the Commission seeks comment on methodologies for performing such tests to obtain the data necessary to demonstrate compliance with the specified technical requirements for the types of radars anticipated to operate under 15.255 rules. For example, should transmission bandwidth be represented only by the chirp or pulse specifications or should it be expressed as a measured occupied bandwidth, 20-

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dB bandwidth, or other representation?
Similarly, should peak power measurements be avoided to eliminate potential for inaccurate amplitude results due to measurement instrumentation desensitization?
Measured power levels for radio frequency RF pulses that are frequency modulated chirped vary as a function of the bandwidth in which the measurement is performed; if chirped pulses cause RF interference, the power levels of the pulses in victim receivers will likewise vary as a function of receiver bandwidth. NTIA Technical Report TR12488 provides both heuristic and rigorous derivations of the relationships among chirped pulse parameters and the measured peak and average power levels of chirped pulses as a function of measurement bandwidth. These relationships may be best understood via a single graph Figure 3 presented in this report. This report supplements NTIA Technical Reports TR05420, TR10465 and TR10466, in which the formula for minimum bandwidth needed for measurement of full peak power in chirped pulses is presented but not derived. The Commission seeks comment on NTIAs technical report and its applicability to measurements of chirped signals.
The Commission proposes to exempt FMCW and other similar sweptfrequency radars from the 15.31c requirement to stop the frequency sweep when measuring the relevant technical parameters. Stopping the sweep is physically impractical for most of these types of devices and can result in inaccurate measurements. In addition, the Commission proposes to remove the 15.255c4 requirement to use an RF detector with a detection bandwidth that encompasses the 5771
GHz frequency range for performing peak power measurements. The Commission believes that this requirement is superseded by the more recent inclusion of 15.255i, which sets out a flexible approach toward measurement that can be adapted more effectively as the technology of devices and test instrumentation evolve. Finally, the Commission proposes to specify that the provision of 15.35c that requires calculating average field strength over a complete pulse train or 100
milliseconds is not applicable to pulsed or burst radars that operate in the 60
GHz band. This measurement requirement was originally designed for low frequency pulse-code modulated devices such as garage door openers and the Commission believes it is not appropriate for high frequency radars.

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The Commission seeks comment on these proposals.
Initial Regulatory Flexibility Act. The Regulatory Flexibility Act of 1980, as amended RFA, requires that a regulatory flexibility analysis be prepared for notice and comment rulemaking proceedings, unless the agency certifies that the rule will not, if promulgated, have a significant economic impact on a substantial number of small entities. Accordingly, the Commission has prepared an Initial Regulatory Flexibility Analysis IRFA
concerning potential rule and policy changes contained in this Notice of Proposed Rulemaking.
Initial Paperwork Reduction Act Analysis. This Notice of Proposed Rulemaking does not contain potential new or revised information collection requirements subject to the Paperwork Reduction Act of 1995, Public Law 104
13. In addition, therefore, it does not contain any proposed information collection burden for small business concerns with fewer than 25 employees, pursuant to the Small Business Paperwork Relief Act of 2002, Public Law 107198, see 44 U.S.C. 3506c4.
Ex Parte RulesPermit-But-Disclose.
This proceeding shall be treated as a permit-but-disclose proceeding in accordance with the Commissions ex parte rules. Ex parte presentations are permissible if disclosed in accordance with Commission rules, except during the Sunshine Agenda period when presentations, ex parte or otherwise, are generally prohibited. Persons making ex parte presentations must file a copy of any written presentation or a memorandum summarizing any oral presentation within two business days after the presentation unless a different deadline applicable to the Sunshine period applies. Persons making oral ex parte presentations are reminded that memoranda summarizing the presentation must 1 list all persons attending or otherwise participating in the meeting at which the ex parte presentation was made, and 2
summarize all data presented and arguments made during the presentation. Memoranda must contain a summary of the substance of the ex parte presentation and not merely a listing of the subjects discussed. More than a one or two sentence description of the views and arguments presented is generally required. If the presentation consisted in whole or in part of the presentation of data or arguments already reflected in the presenters written comments, memoranda or other filings in the proceeding, the presenter may provide citations to such data or arguments in his or her prior comments,
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