Critical federal stakeholders—including the U.S. Air Force
55
—support the
adoption of the International Telecommunications Union-recommended 1 dB
interference protection criterion (IPC) for radio navigation services, including
GPS.
56
Disruption to GPS could have significant impact to U.S. industry, safety,
and economy. Beyond losing life-saving, mission-critical communications, GPS
disruption could result in costs to U.S. GPS users and manufacturers of as much
as $96 billion per year.
57
In order to advance our national interests in both GPS and other spectrum-based
services, NTIA will gather data from stakeholders on interference protection
needs for space communications, potential mitigating technologies against
harmful interference, and best practices that would encourage innovation and
deployment of next generation space communications and report to the Secretary
no later than June 1, 2019. The NTIA report will include recommendations and
analysis that address, inter alia, the ITU-R M.1903 recommendation and the U.S.
Air Force’s proposal for a 1 dB IPC
58
and prior work done within NTIA and the
U.S. government on this and related issues.
59
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
55
Memorandum from Air Force IRAC Representative to the IRAC Chairman, re: Doc. 43501/1 OET Public Notice
on TAC Spectrum Policy Recommendations, ET Docket No. 17-430 (Dec. 29, 2017); see also Background Paper
on Use of A 1-Db Decrease In C/N0 As GPS Interference Protection Criterion, GPS.GOV,
https://www.gps.gov/spectrum/ABC/1dB-background-paper.pdf (last visited Sept. 12, 2018).
56
See ITU-R Recommendation M.1903 at 9 (2012), available at https://www.itu.int/dms_pubrec/itu-r/rec/m/R-
REC-M.1903-0-201201-I!!PDF-E.pdf (“[T]he accepted approach is to define the aggregate interference power
density threshold at a level that will not raise the total noise floor by more than 1 dB above the environmental noise
floor.”).
57
See Nam D. Pham, The Economic Benefits of Commercial GPS Use in the U.S. and The Costs of Potential
Disruption, NDP CONSULTING 2 (June 2011),
https://static1.squarespace.com/static/52850a5ce4b068394a270176/t/52d84e86e4b042903508ec47/1389907590034/
GPS|Report|June|21|2011.pdf (last visited Sept. 19, 2018).
58
See supra notes 56 and 57.
59
See Final Report, GPS TECHNICAL WORKING GROUP (June 30, 2011), available at
https://ecfsapi.fcc.gov/file/7021690471.pdf; Letter from Lawrence E. Strickling, Assistant Secretary for
Communications and Information, U.S. Department of Commerce, to Julius Genachowski, Chairman, Federal
Communications Commission (Feb. 14, 2012), available at
https://www.ntia.doc.gov/files/ntia/publiations/lightsquared_letter_to_chairman_genachowski_feb_14_2012.pdf;
Tom Powell, Adjacent Band Interference to Consumer Receivers, THE AEROSPACE CORPORATION 4, 5 (May 7,
2013), available at https://www.gps.gov/governance/advisory/meetings/2013-05/powell.pdf (last visited Sept. 12,
2018); W. Young et al., NIST Technical Note 1952: LTE Impacts on GPS – Final Report, NASCTN (Feb. 2017),
available at https://nvlpubs.nist.gov/nistpubs/TechnicalNotes/NIST.TN.1952.pdf; Final Report: Assessment to
Identify Gaps in Testing of Adjacent Band Interference to the Global Positioning System (GPS) L1 Frequency Band,
NATIONAL SPACE-BASED POSITIONING, NAVIGATION, AND TIMING SYSTEMS ENGINEERING FORUM (Mar. 2018),
available at https://go.usa.gov/xPQE8; Global Positioning System (GPS) Adjacent Band Compatibility Assessment:
Final Report, U.S. DEP’T OF TRANSPORTATION (Apr. 2018), available at https://go.usa.gov/xPQPt.