The approach in the study is based on standard link budget models that are typically used for assessing the quality of a wireless link, or for evaluating spectral coexistence between radio systems.
Monte Carlo simulation with carefully justiﬁed radio system parameters were used to assess the interference impact of the miniature short range radars. The study was intended to inform the discussion around an increased emission power of Google’s Project Soli short range miniature radar system, developed by Google ATAP in 2017, up to a level compliant with the ETSI EN 305 550 standard, although the results potentially could be extrapolated to similar technologies intended to operate within the 60 GHz band. Project Soli is a sensor for touchless gesture interactions in consumer electronics devices (wearables, home networks, phones).
The study is available from the FCC document server: 2018-06-08 Google Letter re Project Soli + Studies.pdf