Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Reexamination Certificate
2005-03-15
2005-03-15
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
C343S909000, C343S91100R
Reexamination Certificate
active
06867741
ABSTRACT:
Disclosed is an antenna system including a Luneberg Lens having a spherically shaped outer surface and a spherically shaped focal surface spaced from its outer surface with a plurality of patch antenna elements disposed along the focal surface of the Luneberg Lens; and a power combiner for combining signals received by said plurality of patch antenna elements. The disclosed antenna system may be used a part of a robust GPS system having a plurality of GPS satellites each transmitting a GPS signal; a plurality of airborne GPS platforms, each GPS platform including a GPS transmitter for transmitting its own GPS signal, the GPS signals being transmitted from the plurality of airborne GPS platforms being differentiated from the GPS signals transmitted by visible GPS satellites; and at least one terrestrially located GPS receiver for receiving the GPS signals transmitted by visible ones of the GPS satellites and by visible ones of said airborne GPS platforms.
REFERENCES:
patent: 5430656 (1995-07-01), Dekel et al.
patent: 5512902 (1996-04-01), Guthrie et al.
patent: 5548294 (1996-08-01), Sturza
patent: 5570097 (1996-10-01), Aguado
patent: 5712641 (1998-01-01), Casabona et al.
patent: 5821908 (1998-10-01), Sreenivas
patent: 5886666 (1999-03-01), Schellenberg et al.
patent: 6018316 (2000-01-01), Rudish et al.
patent: 6018659 (2000-01-01), Ayyagari et al.
patent: 6084540 (2000-07-01), Yu
patent: 6166679 (2000-12-01), Lemelson et al.
patent: 6356247 (2002-03-01), Hirtzlin et al.
patent: 1 098 455 (2001-05-01), None
Blas, J.M., et al., “GPS Adaptive Array for Use in Satellite Mobile Communications,”Satellite Systems for Mobile Communications and Navigation Conference Publication, May 13-15, 1996, pp 28-31.
Fante, R.L., et al., “Cancellation of Jammers and Jammer Multipathy in a GPS Receiver,”IEEE AES Systems Magazine, Nov. 1998, pp 25-28.
GPS NAVSTAR, “Global Positioning System Standard Positioning Service Signal Specification,” 2nd Ed., Jun. 2, 1995.
Matthaei, G.; et al.,Microwave Filters, Impedance-Matching Networks, and Coupling Structures, Artech House Books, Dedham, MA, Chapter 16, pp 965-1000, 1980.
Padros, N., et al., “Comparative Study of High-Performance GPS Receiving Antenna Designs,”IEEE Trans. Antennas and Propag., vol. 45, No. 4, Apr. 1997, pp 698-706.
Schrank, H., et al., “A Luneberg-Lens Update,”IEEE Antennas and Propagation Magazine, vol. 37, No. 1, Feb. 1995, pp 76-79.
“A Low-Profile Luneberg Lens Airborne GBS Antenna.” INTERNET: <http://www.ecs.umass.edu/ece/allerton/papers/GBS/> 7 pages (visited May 1, 2001).
“Luneberg Lenses Made of Open-Cell Polyurethane Foams.” INTERNET: <http://www.nasatech.com/Briefs/Jan99/NPO20339.html> 1 page (visited May 1, 2001).
“SiRF Technology, Inc.—GPS Technology White Paper.” INTERNET: <http://www.sirf.com/gps_tech_white_paper.htm> 7 pages (visited May 1, 2001).
“NAVSTAR GPS Operations—USNO NAVSTAR Global Positioning System.” INTERNET: <http://tycho.usno.navy.mil/gpsinfo.html> 2 pages (visited May 1, 2001).
Lynch Jonathan J.
Schaffner James H.
Sievenpiper Daniel F.
Chen Shih-Chao
HRL Laboratories LLC
Ladas & Parry LLP
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