Short range ranging system

Details Short range ranging system Short range ranging system

1986-10-08

1989-05-23

Moskowitz, Nelson

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With remote cooperating station

342127, G01S 1338

Patent

active

048334804

ABSTRACT:
An accurate ranging system for position determination of a mobile unit using trilateralization. A pair of active reflectors return signals transmitted by the mobile unit in phase at the reflectors, after compensating for interval circuit delay. The mobile unit compares the phases and determines mutual distances and thus its position. The invention includes a two frequency technique for compensating for inaccuracies introduced at distances in excess of one wavelength and for inaccuracies observed at a large multiple of wavelengths, and also includes means for dynamically compensating for drift.

REFERENCES:
patent: 3780370 (1973-12-01), Reeves
patent: 4011562 (1977-03-01), Bruce

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