Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna pattern plotting
Patent
1995-07-07
1997-10-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna pattern plotting
342375, 342174, 342165, H01Q 322
Patent
active
056776969
ABSTRACT:
A method and apparatus for remotely calibrating a system having a plurality of N elements, such as a phased array system, is provided. The method includes generating coherent signals, such as a calibration signal and a reference signal having a predetermined spectral relationship between one another. The calibration signal which is applied to each respective one of the plurality of N elements can be orthogonally encoded using a unitary transform encoder that uses a predetermined transform matrix, such as a Hadamard transform matrix or a two-dimensional discrete Fourier transform matrix, to generate a set of orthogonally encoded signals. The set of orthogonally encoded signals and the reference signal are transmitted to a remote location. The transmitted set of orthogonally encoded signals is coherently detected at the remote location. The coherently detected set of orthogonally encoded signals is then decoded using the inverse of the predetermined encoding matrix to generate a set of decoded signals. The set of decoded signals is then processed for generating calibration data for each element of the phased array system.
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U.S. patent application entitled "A Method and Apparatus For Remotely Calibrating A Phased Array System Used for Satellite Communication" (Attorney Docket RD-23598) Seth D. Silverstein et al.
Engeler William Ernest
Nevin Robert Leland
Silverstein Seth David
General Electric Company
Phan Dao L.
Snyder Marvin
Tarcza Thomas H.
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