Simultaneous nulling for monopulse array with partially adaptive weights
TL;DR: In this article, a simple method for synthesizing low-sidelobe sum and difference patterns with partially adaptive weights is described, where only part of the weights are adapted for simultaneous nulling.
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Abstract: A new simple method is described for synthesizing low-sidelobe sum and difference patterns with partially adaptive weights. By partially adaptive, we mean that only part of the weights are adapted for simultaneous nulling. These adaptive weights are shared by the sum and difference channels, leading to a significant reduction in the number of variable attenuators/phase shifters used, as compared to the fully adaptive implementation. An objective function is derived that yields different configurations of the shared adaptive weights. Numerical examples are presented to ascertain the efficacy of the new method for both point and extended interference. >
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Citations
Synthesising Taylor and Bayliss linear distributions with common aperture tail
TL;DR: In this paper, a simple method for synthesizing low-sidelobe sum and difference patterns with a common aperture zone is presented, based on the perturbation of the Bayliss roots by means of the simulated annealing technique.
40
Null Formation with Excitation Constraints in the Pattern Synthesis for Circular Arrays of Antennas
TL;DR: With reference to circular arrays of antennas, a method for synthesizing a desired pattern in the presence of both null constraints and excitation constraints is presented, allowing us to reduce both the dynamic range ratio of the excitations and the pattern degradation due to the quantization of theexcitations.
22
Pattern Nulling by Iterative Phase Perturbation
M. J. Mismar,T. H. Ismail +1 more
TL;DR: In this paper, a method for linear array pattern synthesis with multiple suppressed sectors using phase-only control of the antenna elements is presented, where large phase perturbations are obtained by solving the nonlinear problem using an iterative procedure with linear programming.
Optimal Compromise Between Sum and Difference Patterns While Fixing Quasi-Nulls in Both
J.A. Rodriguez,F. Ares +1 more
TL;DR: Methods previously developed for designing linear array monopulse antennas with relatively simple feed network requirements are extended to allow the suppression of jamming signals in both sum and difference modes.
9
Null control pattern for circular antenna arrays
Roberto Vescovo,Edoardo Carli +1 more
- 01 Oct 1995
TL;DR: A new technique is proposed that allows placing nulls at prescribed directions of interference in a given array pattern to determine the array pattern which minimises the mean-square distance from the assigned pattern, while satisfying the null constraints.
4
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TL;DR: In this article, a one-parameter family of current distributions for symmetric broadside arrays of equally spaced point sources energized in phase was derived, and design curves relating the value of the parameter to side-lobe level as well as the relative current values expressed as a function of side lobe level were given for the cases of 8-, 12-, 16-, 20-, and 24-element linear arrays.
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Methods for null control and their effects on the radiation pattern
TL;DR: Several methods for synthesis of array antenna patterns with prescribed nulls are reviewed, with attention focused on the characteristic features of the resultant patterns, which provide a perspective on the performance of adaptive antenna systems, which employ these various control architectures.
268
Design of monopulse antenna difference patterns with low sidelobes
TL;DR: In this paper, a Fourier-Bessel series of N terms is used to express the difference pattern in a manner similar to Taylor's treatment of the sum pattern, and the Fourier coefficients are derived for both the circular aperture series and the different pattern series.
171
Simple method for pattern nulling by phase perturbation
TL;DR: In this article, a method of sidelobe hulling, which involves perturbing the array illumination phase only, is presented, and the general nonlinear problem is linearized by assuming the perturbations to be small.
Adaptive sidelobe nulling using digitally controlled phase-shifters
C. Baird,G. Rassweiler +1 more
TL;DR: Computer simulations and breadboard array measurements substantiate the mathematical development and indicate the practicality of the optimal phase weightings and demonstrate the decomposition of the antenna pattern into a sum of patterns which place gain towards each directional emitter.
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