Abstract: A method of estimating the location of the source of a signal of interest (SOI), includes the steps of: (a) sensing a plurality of directional samples of the SOI by using at least one signal receiving system at disparately located signal receiving locations; (b) with at least one of the signal receiving systems, measuring the power variable of the received SOI; and (c) processing the sensed directional samples of the SOI in combination with the power variable measurement of the SOI to estimate the location of the source of the SOI.

Abstract: Space-time coding is applied to a wave transmitter, receiver, or both. In general, the space-time coding is performed by real or synthetic motion of the transmitter or receiver, with the location of energy radiation/reception varying over the symbol duration with at least one occurrence during the symbol duration of a minimum instantaneous speed greater than a quarter of the ratio of the smallest wavelength of the waves divided by the symbol duration, and with coded acceleration of the modification of location to modify the velocity over the symbol duration.