1. A method for processing a signal, comprising: transmitting modulated radio frequency electromagnetic radiation propagating along at least one off axis path with respect to a receiver toward a scattering medium; scattering the modulated radio frequency electromagnetic radiation with the scattering medium; receiving the scattered modulated radio frequency electromagnetic radiation at the receiver, wherein the receiver has a plurality of receiving antennas, each receiving a respective distinct scattered modulated radio frequency electromagnetic radiation signal; determining a respective time delay associated with the received scattered modulated radio frequency electromagnetic radiation signals with at least one correlator; and determining expected characteristics of the respective scattered modulated radio frequency electromagnetic radiation signals at the receiver.