In general, the physics of the relationship between the pressure field surrounding a rotating propeller in subsonic flow and the flow characteristics is understood. However, quantification of this relationship in a way that allows engineering analysis of propeller noise is limited by complete definition of the inflow distortions. Therefore, a way of inferring this relationship and the distortion characteristics unobtrusively and in situ has been developed. The technique is based on the assumption that measurements of the unsteady pressure on the blades are available. From the pressures, the technique predicts the radiated acoustic far field, infers incoming flow characteristics, and defines Green's function between the near and far pressure fields. The analysis combines theoretical and empirical treatments of pressure data to infer the acoustic quantities. Thus, the turbulence ingestion problem is approached in a practical manner without the need for many of the simplifying assumptions required by purely theoretical means. The technique is developed for use on experimental data. The technique is subsequently applied to a propeller operating downstream of large-scale, mean-flow distortions, and ingesting broadband turbulence (Minniti, R. J., Blake, W. K., and Mueller, T. J., Inferring Propeller Inflow and Radiation from Near-Field Response, Part 2: Empirical Application, AIAA Journal, Vol. 39, No. 6, 2001, pp. 1037-1046).