Stabilisation of phased array antennas
First Claim
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1. A method of stabilizing the action of a phased array antenna system, comprising the operations of:
- monitoring the amplitudes and phases of signals applied to or produced by elements of the antenna by extracting identical proportions of said signals from extracted signals;
detecting departures from a norm of the amplitudes and phases of the said signals comprising the steps of;
comparing the extracted signals with a reference signal by delaying each extracted signal by a predetermined amount with respect to its predecessor, adding the delayed extracted signals to produce a complex composite signal and convolving that signal with a time reversed complex conjugate of the reference signal, andderiving an error function signal related to departures of the values of the amplitude and phase of the extracted signals from values of the same parameters relating to the reference signal;
deriving clearing correction signals related thereto; and
using the clearing correction signals to vary the action of a signal handling network associated with the elements of the antenna to correct for the departures from the norm of the amplitudes and phases of the said signals.
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Abstract
A method of stabilizing the action of a phased array antenna system in which the amplitudes and phases of signals applied to, or produced by, elements of the antenna are monitored, differences are detected and suitable weighting factors are determined and applied to remove the differences between the amplitudes and phases of the said signals.
Transmitting and receiving antenna systems are described.
23 Citations
11 Claims
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1. A method of stabilizing the action of a phased array antenna system, comprising the operations of:
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monitoring the amplitudes and phases of signals applied to or produced by elements of the antenna by extracting identical proportions of said signals from extracted signals; detecting departures from a norm of the amplitudes and phases of the said signals comprising the steps of; comparing the extracted signals with a reference signal by delaying each extracted signal by a predetermined amount with respect to its predecessor, adding the delayed extracted signals to produce a complex composite signal and convolving that signal with a time reversed complex conjugate of the reference signal, and deriving an error function signal related to departures of the values of the amplitude and phase of the extracted signals from values of the same parameters relating to the reference signal; deriving clearing correction signals related thereto; and using the clearing correction signals to vary the action of a signal handling network associated with the elements of the antenna to correct for the departures from the norm of the amplitudes and phases of the said signals. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for stabilizing the action of a phased array receiving antenna, comprising:
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a plurality of receivers, each receiver being connected to an element of the antenna; means for extracting a specified proportion of input signals produced by the elements of the antenna and applied to the receivers; means for comparing the extracted signals with a reference signal and producing an error function signal related to differences between the extracted signals and the reference signal comprising; a series of delay devices so arranged that each extracted signal is delayed by the same amount relative to its predecessor, means for adding the successively delayed extracted signals and producing a complex composite signal related thereto, and a comparator to which the reference signal is applied; means responsive to the error function signal to operate upon the output signals from the receivers to equalizing the amplitudes and phases of the output signals from the receivers; and means for combining the equalizing signals from the receivers. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification