1. A system for obtaining data indicative of a characteristic of a continuous medium or a target located within a predetermined volume of space, which comprises: a sensor configuration including at least one sensor for acquiring a plurality of signals from the continuous medium or the target, each one of said plurality of signals being centered at a respective distinguishable frequency; a processing circuit for obtaining said data indicative of said characteristic of the continuous medium or the target by calculating a plurality of powered weighted increments using said plurality of signals acquired by said sensor configuration and by relating said plurality of powered weighted increments to said characteristic of the continuous medium or the target using a plurality of models; and an output circuit connected to said processing circuit for outputting the characteristic of the continuous medium or the target.