The antenna interface sends raw data to the Array subsystems, made up of the RMA units. This data is converted into In-Phase (I) and Quadrature-Phase (Q) data, also called “analytic signal,” which assigns the signal vectors more specific three dimensional coordinates according to Dr. Sharlene Katz of California State University at Northridge.
https://defensesystems.com/articles/2017/04/10/navyradar.aspx
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