Passive ranging method and apparatus

Details Passive ranging method and apparatus Passive ranging method and apparatus

G - Physics

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G01S 5/06 (2006.01) G01S 3/48 (2006.01) G01S 5/04 (2006.01) G01S 5/14 (2006.01) G01S 11/00 (2006.01) G01S 11/04 (2006.01)

Patent

CA 1279391

PASSIVE RANGING METHOD AND APPARATUS Abstract Of The Disclosure A method and apparatus for passive ranging from a moving platform to a stationary, non-cooperative emitter utilizes a Long Baseline Interferometer and a Short Baseline Interferometer, the former to provide a very precise, but highly ambiguous, measurement of change in phase occurring between two points along the moving platform's path, and the latter to provide a measurement of the emitter's angular position relative to the plat- form's path at the two points and to resolve ambiguities in the phase change measurements of the former, resulting in a system with enhanced accuracy over prior art devices which may be used against signals that are phase-coded, frequency-coded or frequency-hopped. An error model and a criterion for optimization of the system in terms of measurement error, interferometer length and orientation, and vibration amplitude are presented.

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