Passive ranging method and apparatus using interferometric scann

Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating

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364458, G01S 314

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active

046426493

ABSTRACT:
In a passive-type ranging system in which a pair of directional antennas mounted in spaced apart relationship along a baseline are synchronously scanned on a distant emitter of RF radiation for determining the range to the emitter as a function of a time differential t.sub.21 of the received emissions at the spaced antennas, an improved method and apparatus is disclosed in which each of the separate antennas is replaced by an electronically steered interferometer sensor. The pair of spaced, interferometer sensors are scanned in phase-locked synchronization to cause the characteristic multiple interference lobes and intervening nulls to sweep across the distant emitter. Certain of the sensors, lobes, or nulls, are used as highly directional indices for precision measurement of the range determining time differential t.sub.21. In order to maintain close phase synchronization between the scanning positions of the multi-lobe interference patterns, a pilot signal emitter is mounted on the same platform as the interferometer sensors and positioned along the boresight of the sensors for emitting a point source of a known signal to which the electronic steering signals that drive the sensors are phase-locked.

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