Journal Article10.1049/IP-H-1.1984.0050
Method of null steering without using phase shifters
T.B. Vu
- 01 Aug 1984
- Vol. 131, Iss: 4, pp 242-245
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TL;DR: In this article, it is shown that if the number of jammers is much smaller than half the total number of elements in the array, it is possible to optimise the pattern as well as suppress the jammers.
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Abstract: Null steering without using phase shifters is achieved by forcing the zeros of the array factor to occur in conjugate pairs on the unit circle in the complex plane. It is shown that if the number of jammers is much smaller than half the total number of elements in the array, it is possible to optimise the pattern as well as suppressing the jammers. Alternatively, wide nulls in the radiation pattern can be easily approximated.
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Citations
Null steering in phased arrays by controlling the element positions
T. H. Ismail,M.M. Dawoud +1 more
TL;DR: A technique is presented for null steering based on the element position perturbations that frees the phase shifters to be used solely for steering the main beam toward the direction of the desired signal.
148
Simultaneous nulling in sum and difference patterns by amplitude control
TL;DR: It is shown that because the resulting current amplitude distribution has a double symmetry, the number of attenuators required for simultaneous nulling can be as low as a quarter of the total number of elements in the array.
51
Adaptive wide null steering for digital beamforming array with the complex coded genetic algorithm
Yilong Lu,Beng-Kiong Yeo +1 more
TL;DR: In this paper, the adaptive wide null steering for a digital beamforming (DBF) array with the versatile and powerful GA algorithm is presented. But the GA approach is applicable for arrays of any configuration, as shown by the numerical results.
37
Interference suppression by element position control of phased arrays using LM algorithm
TL;DR: In this article, a new numerical technique is proposed for array pattern synthesis to suppress multiple interference signals using the position perturbations of linear antenna elements using the iterative Levenberg-Marquardt (LM) algorithm.
35
Phase-Only Control for Antenna Pattern Synthesis of Linear Arrays Using the Levenberg-Marquardt Algorithm
TL;DR: In this article, a numerical technique for sector nulling using phase-only perturbations of the array elements is presented, based on a template of a prescibed array pattern and a relative error for the cost function that is used in the Levenberg-Marquardt algorithm.
25
References
Phase-only optimization for the generation of wide deterministic nulls in the radiation pattern of phased arrays
R. Giusto,P. De Vincenti +1 more
TL;DR: In this article, the phase-only optimization of each array element for the generation of wide deterministic nulls in the sidelobe region of the radiation pattern of a phased-array antenna is presented.
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