High-precision fringe tracking invariant to systematic model errors |
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Authors: | Karlov V I Padilla C E Soosaar K Matson L E Chun H M Webb G V |
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Affiliation: | SBI-Moldyn Inc, Cambridge, Massachusetts 02139, USA. |
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Abstract: | We present a new approach to processing of interferometric data, which dramatically improves operation on the smallest fraction of the fringe (approximately 1/1,000 of a wavelength and beyond). In particular, this approach, dubbed the variation-invariant subspace tracking approach (VISTA), makes it possible to operate a Michelson interferometer in a highly stable mode in which the estimation of optical path delay becomes invariant (insensitive) to a large class of systematic model errors. This previously unknown invariance property of interferometry follows from the fundamental odd-even symmetry of the channeled spectrum and its derivatives. VISTA offers a powerful algorithmic alternative for alleviating technological challenges in the design of high-precision long-baseline spaceborne interferometers. |
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