Stepped frequency radar

Communications: directive radio wave systems and devices (e.g. – Determining distance – Combined with determining direction

Reexamination Certificate

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Details

C342S175000, C342S196000

Reexamination Certificate

active

07936301

ABSTRACT:
A multi-port junction is fed with a frequency-stepped source and has one of its ports connected to an antenna that can serve either as a transmit-and-receive antenna or as a receive antenna only, with the outputs of the multi-port junction being used to estimate a complex reflection coefficient for each frequency of interest. The subject system requires no IF stages, down-conversion mixers or oscillators, and therefore may be provided adjacent each antenna at low cost. An embodiment involving co-located separate transmit and receive antennas is used to minimize the power requirements for the multi-port junction, whereas in a third embodiment, an array of transmit/receive antennas is used, fed by the same RF source but in which digitally-controlled phase shifters are used for beam-forming purposes.

REFERENCES:
patent: 4857935 (1989-08-01), Bates
patent: 5153596 (1992-10-01), Stove
patent: 5587713 (1996-12-01), Pfizenmaier et al.
patent: 5610611 (1997-03-01), McEwan
patent: 5910785 (1999-06-01), Normant
patent: 5952955 (1999-09-01), Kennedy et al.
patent: 6072419 (2000-06-01), Normant

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