Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Reexamination Certificate
2011-05-03
2011-05-03
Phan, Dao L (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
C342S382000, C342S373000
Reexamination Certificate
active
07936304
ABSTRACT:
This invention relates to the use of a sufficiently-sampled auxiliary array in combination with one or more under-sampled sub-arrays. The sufficiently-sampled auxiliary array is used to create a signal-free reference (SFR) beam that contains grating lobe interference. The SFR may be used to cancel the interfering grating lobe in an under-sampled main beam by coherently eliminating or subtracting the SFR from the main beam. Exemplary aspects of the invention thus support significant under population of the full aperture and avoid the problems and limitations of previous solution, with consequent savings in sensor hardware cost and weight.
REFERENCES:
patent: 4495502 (1985-01-01), Masak
patent: 4937584 (1990-06-01), Gabriel et al.
patent: 5652591 (1997-07-01), Liu et al.
Barnard Thomas J.
Canavan Thomas M.
Howard IP Law Group PC
Lockheed Martin Corporation
Phan Dao L
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