Interference is more or less electrical noise in an electrical path or a circuit that is caused by an external source. How can 5G signals interfere with Radar Altimeters? In this blog post, I will show a simulation of a worst-case interference scenario and demonstrate how interference can be analyzed and reduced to acceptable levels using the electromagnetic simulation tools in SIMULIA CST Studio Suite. The directive affected around 2500 aircraft in the US and 8000 worldwide (1).ĥG interference mitigation is therefore an important concern, both for the safety of aircraft and the economic viability of 5G deployment. Afterward, the Federal Aviation Administration(FAA) issued an Airworthiness Directive revising the landing requirements for several aircraft at airports where interference could occur during the approach and landing of aircraft in an airport where 5G is deployed in the vicinity. This approval was made despite the aviation industry informing the FCC in 2018 of the need to ensure that radar altimeters are protected from 5G interference since radar altimeters are key in aircraft safety systems including terrain proximity, autothrottle, and collision avoidance. This band is adjacent to the spectrum used by radar altimeters (4.2 – 4.4 GHz). In early 2021, the Federal Communications Commission (FCC) granted the mobile wireless industry radio spectrum in the “C-Band,” or 3.7 – 3.98 GHz, to operate 5G transmissions.
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