Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Reexamination Certificate
2007-01-30
2007-01-30
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
C342S118000, C342S128000, C342S165000, C342S173000, C342S174000, C342S175000, C342S176000, C342S179000, C342S194000, C342S195000, C342S196000, C343S757000
Reexamination Certificate
active
11298203
ABSTRACT:
A FM-CW radar system comprises a frequency modulated continuous wave digital generator that produces both in-phase (I) and quadrature-phase (Q) outputs to orthogonally oriented transmitter antennas. A linearly polarized beam is output from a switched antenna array that allows a variety of I-and-Q pairs of bowtie antennas to be alternately connected to the transmitter and receiver. The receiver inputs I-and-Q signals from another bowtie antenna in the array and mixes these with samples from the transmitter. Such synchronous detection produces I-and-Q beat frequency products that are sampled by dual analog-to-digital converters (ADC's). The digital samples receive four kinds of compensation, including frequency-and-phase, wiring delay, and fast Fourier transform (FFT). The compensated samples are then digitally converted by an FFT-unit into time-domain signals. Such can then be processed conventionally for range information to the target that has returned the FM-CW echo signal.
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patent: 6028563 (2000-02-01), Higgins
patent: 6121917 (2000-09-01), Yamada
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Gregory Bernarr E.
Hill Robert Charles
LandRay Technology, Inc.
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