Passive ranging method and apparatus

Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver

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342458, 364458, G01S 502

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active

047347023

ABSTRACT:
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 platform'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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Authors: A. R. Baron, K. P. Davis, C. P. Hofmann, "Microwave Journal", Sep., 1982, pp. 59-76.

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