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Independent component analysis approach to resolve the multi-source limitation of the nutating rising-sun reticle based optical trackers

Independent component analysis (ICA) is described for a number of signals from different sources and a number of receivers. When applied to nutating rising-sun reticle optical trackers, ICA enables the discrimination of optical sources whit an appropriate number of detectors. The main contribution of this paper is the conclusion that coherence between optical sources results in a nonlinear ICA problem that becomes linear when the optical fields are incoherent. It is shown that requirements necessary for the ICA theory to work are fulfilled for both coherent and incoherent optical sources. Moreover, it is shown additionally that by the proper design of the optical tracker the nonlinear model can be converted into linear one by simple linear bandpass filtering operation. Consequently, the multisource limitation of the nutating rising-sun reticle based optical trackers can in principle be overcome for both coherent and incoherent optical sources.

coherence; independent component analysis; infrared reticel trackers; countermeasures; counter-countermeasures

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