Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1990-05-22
1994-07-05
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342 13, 342146, 342126, 342451, 342458, G01S 304, G01S 510
Patent
active
053271459
ABSTRACT:
A method of passive ranging and geolocation of multiple emitters by a single detection platform. Two independent emission sequences support formulation of two independent algebraic equations involving a triangular arrangement of platform and emitters. One sequence constitutes an interrogation signal by one emitter and a transponded or reflected signal from another. A second emission sequence constitutes the reversed order of emitters from those of the first emission sequence. The method utilizes the steps of measuring the time difference of arrival at the platform of signals having travelled the direct path and the transponded or reflected paths, and measuring the angles of arrival of received signals for each independent emission sequence. A series of steps computing ranges and angles based on prior measurements provide a set of desired ranges and angles identifying the relative positions of the emitters relative to the platform. The invention may be employed in bistatic or transponded mode depending on the kind of signal emissions that are to be exploited. In the bistatic mode, the energy from an emitter is reflected from the other emitter. In the transponder mode the emitters communicate in an interrogation-transpond format with signals with known and small internal time delays. In the transponder mode, both signals are direct path signals.
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patent: 3939476 (1976-02-01), Leopard et al.
patent: 4642648 (1987-02-01), Hulland et al.
patent: 4954837 (1990-09-01), Baird et al.
Denson-Low Wanda K.
Hughes Aircraft Company
Sotomayor John B.
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