Method and apparatus for remotely calibrating a phased array system used for satellite communication using a unitary transform encoder
First Claim
1. A method for remotely calibrating a system having a plurality of N elements, N being a positive integer number, said method comprising the steps of;
- coherently generating a calibration signal and a reference signal having a predetermined spectral relationship between one another;
applying to each respective one of said plurality of N elements the calibration signal;
providing an encoder for encoding the calibration signal applied to each respective one of said plurality of N elements to generate a set of encoded signals, said encoder comprising a unitary transform encoder based upon entries of a predetermined unitary transform matrix T;
transmitting the set of encoded signals and the reference signal to a remote location;
coherently detecting the transmitted set of encoded signals at the remote location;
decoding the coherently detected set of encoded signals to generate a set of decoded signals; and
processing the set of decoded signals for generating calibration data for each element of said system.
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Accused Products
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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Citations
24 Claims
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1. A method for remotely calibrating a system having a plurality of N elements, N being a positive integer number, said method comprising the steps of;
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coherently generating a calibration signal and a reference signal having a predetermined spectral relationship between one another; applying to each respective one of said plurality of N elements the calibration signal; providing an encoder for encoding the calibration signal applied to each respective one of said plurality of N elements to generate a set of encoded signals, said encoder comprising a unitary transform encoder based upon entries of a predetermined unitary transform matrix T; transmitting the set of encoded signals and the reference signal to a remote location; coherently detecting the transmitted set of encoded signals at the remote location; decoding the coherently detected set of encoded signals to generate a set of decoded signals; and processing the set of decoded signals for generating calibration data for each element of said system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for remotely calibrating a system having a plurality of N elements, N being a positive integer number, said apparatus comprising:
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a coherent signal generator for generating a calibration signal and a reference signal having a predetermined spectral relationship between one another; means for applying to each respective one of said plurality of N elements the calibration signal; an encoder for encoding the calibration signal applied to each respective one of said plurality of N elements to generate a set of encoded signals, said encoder comprising a unitary transform encoder based upon entries of a predetermined unitary transform matrix T; means for transmitting the set of encoded signals and the reference signal to a remote location; a coherent detector for detecting the transmitted set of encoded signals at the remote location; means for decoding the coherently detected set of encoded signals to generate a set of decoded signals; and a signal processor for processing the set of decoded signals for generating calibration data for each element of said system. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification