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IMS2022


WHITE PAPER




ASSESSING 5G RADAR ALTIMETER INTERFERENCE FOR REALISTIC INSTRUMENT LANDING
SYSTEM APPROACHES

Source: Remcom, Inc.

By Kenneth M. O’Hara

In January 2022, the deployment of 5G service using C-band spectrum around
airports in the US was delayed due to concerns about interference of base
station emissions with radar altimeters on commercial aircraft. Restrictions
which prohibited or limited 5G emissions near airports were voluntarily honored
until early July 2022. To allow more time to complete the task of retrofitting
the entire commercial airline fleet with upgraded radio frequency filters on
altimeters, the FAA and wireless service providers agreed to a phased approach
governing the rollout of the full 5G service between July 2022 and July 2023.
During this time, airports will be identified where 5G services can be enabled
or enhanced while simultaneously ensuring safety of commercial aircraft. Such a
phased rollout will require a detailed and realistic propagation analysis of 5G
emissions on a site-specific basis to identify any possible conditions that
might produce concerning levels of interference during a landing approach.

In this whitepaper we use Remcom’s Wireless InSite 3D Wireless Prediction
Software to simulate the level of interference received at the radar altimeter
input port of a landing aircraft due to emissions from 5G base stations which
are in the vicinity of the approach to runway 27L at Chicago O’Hare
International Airport. This example scenario was chosen as it was considered in
the report prepared by the 5G Task Force of the Radio Technical Commission for
Aeronautics (RTCA) to evaluate radar altimeter safety concerns. However, in
contrast to the RTCA study which only considered line-of-sight propagation, the
Wireless InSite simulation includes a multipath analysis and models interactions
with terrain and building structures which redirect energy toward the radar
altimeter antenna. Our analysis shows that by including such interactions, the
increase in interference beyond the line-of-sight analysis is sufficient to
violate the safety margin used by the RTCA for legacy radar altimeters with low
performance frequency filters.





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Assessing 5G Radar Altimeter Interference For Realistic Instrument Landing
System Approaches


REMCOM, INC.

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