Steepest descent controller for an adaptive antenna array
First Claim
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1. In combination with an adaptive antenna array, a controller for producing substantially stable convergence of weights to reduce sidelobe interference comprising:
- (a) a summing circuit providing an output signal which is the mathematical sum of input signals applied thereto;
(b) a main antenna connected to supply an input signal to said summing circuit;
(c) auxiliary antenna means providing at least one output signal; and
(d) data processing means connected to receive the output signal of said summing circuit and the signal from the auxiliary antenna means for processing the signals according to a steepest descent algorithm to supply output signals to inputs of said summing circuit having optimal feedback gain to substantially reduce sidelobe interference.
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Abstract
An adaptive antenna array including a main antenna and an auxiliary antenna with a steepest descent controller for deriving the optimal feedback gain to guarantee stable and rapid convergence of the weights comprising the weight vector w(t) to form a null in the direction of interference while having minimal effect on the main beam.
45 Citations
12 Claims
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1. In combination with an adaptive antenna array, a controller for producing substantially stable convergence of weights to reduce sidelobe interference comprising:
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(a) a summing circuit providing an output signal which is the mathematical sum of input signals applied thereto; (b) a main antenna connected to supply an input signal to said summing circuit; (c) auxiliary antenna means providing at least one output signal; and (d) data processing means connected to receive the output signal of said summing circuit and the signal from the auxiliary antenna means for processing the signals according to a steepest descent algorithm to supply output signals to inputs of said summing circuit having optimal feedback gain to substantially reduce sidelobe interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In combination with an adaptive antenna array, a controller for producing substantially stable convergence of weights to reduce sidelobe interference comprising:
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(a) a summing circuit providing an output signal, sc which is the mathematical sum of input signals applied thereto; (b) a main antenna connected to supply an input signal to said summing circuit; (c) auxiliary antenna means providing at least one input signal, s; and (d) data processing means connected to receive the output signal of said summing circuit and the signal from the auxiliary antenna means and including variable weighting means coupling the output signal of the auxiliary antenna to the summing circuit and further means for adjusting said variable weighting means in accordance with the following equation ##EQU19## where, w(t) is the weighting adjustment, T is a predetermined time period, with ##EQU20##
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11. In conjunction with an adaptive antenna array including a main antenna and at least one auxiliary antenna a method of weighting signals from the antennas producing substantially stable convergence of the weights to reduce sidelobe interference comprising the steps of:
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(a) weighting signals from the auxiliary antenna; (b) summing the weighted auxiliary antenna signals with signals from the main antenna; and (c) utilizing the summed signals and unweighted signals from the auxiliary antenna to adjust the weighting of the signals from the auxiliary antenna in accordance with a steepest descent algorithm to produce substantially stable convergence of the weights of nullify side-lobe interference.
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12. In conjunction with an adaptive antenna array including a main antenna and at least one auxiliary antenna a method of weighting signals from the antennas producing substantially stable convergence of the weights to reduce sidelobe interference comprising the steps of:
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(a) weighting signals, s, from the auxiliary antenna; (b) summing the weighted auxiliary antenna signals with signals, sc, from the main antenna; and (c) adjusting the weighting of the signals from the auxiliary antenna in accordance with the following equation ##EQU21## where;
w(t) is the weighting adjustment, T is a predetermined time period, and ##EQU22##
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Specification