Communications: directive radio wave systems and devices (e.g. – Radio wave absorber – With particular geometric configuration
Reexamination Certificate
2011-08-02
2011-08-02
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
With particular geometric configuration
C342S357530, C342S357610, C342S363000, C455S288000
Reexamination Certificate
active
07990307
ABSTRACT:
The integrity of operation of a GPS precision aircraft approach and landing system may be compromised by error producing effects of reflected multipath signals. An integrity monitor antenna system as disclosed may utilize both attenuation and shadowing of reflected multipath GPS signals to achieve extreme multipath mitigation of the order of 50 dB suppression. An antenna with a right-hand circular polarization pattern having a sharp cut off at the horizon may provide 30 dB suppression of reflected multipath signals. A signal absorbent ground plane bed of defined dimensions may provide 20 dB attenuation of incident multipath signals. A signal/processor may be employed to derive position error data for integrity monitoring, based upon differentials between a known fixed location and a current GPS-indicated location. Communication of identification of a subset of particular GPS satellites for common usage may also reduce potential error levels.
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BAE Systems Information and Electronic Systems Integration Inc.
Robinson Kenneth P.
Tarcza Thomas H
Vigushin John B
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