Interferometry with multipath nulling

摘要

A method of processing interferometric data derived from an interferometer (20) to eliminate multipath signals and provide an improved estimate of relative angle between an emitter (21) and the interferometer (20) comprises the steps of gathering interferometric data comprising complex signal amplitudes derived from the emitter (21) at a plurality of emitter angles relative to the interferometer (20); processing the complex signal amplitudes derived at each of the plurality of emitter angles by maximizing a predetermined log likelihood function corresponding to a natural logarithm of a predetermined probability density function at each of the plurality of emitter angles to produce a plurality of maximized log likelihood functions; and selecting as the improved estimate of relative angle between the emitter and the interferometer an emitter angle corresponding to an optimally maximized log likelihood function.