Optimum population size and mutation rate for a simple real genetic algorithm that optimizes array factors. Nulling at symmetric pattern location with phaseonly weight control. In this paper, the method of imposing nulls in the radiation pattern of an antenna array is discussed using real coded genetic algorithm rga. A genetic algorithm is a computer program that finds an optimum fill phase settings matrix with random 1s and 0s figure 2.
Pdf fundamentals of signal processing for phased array. Haupt applied research laboratory pennsylvania state university. Haupt, senior member, ieee abstract this paper describes a new approach to adaptive phase only nulling with phased arrays. Ieee transactions on antennas and propagation 45 6. Ive been looking into ways i can implement an adaptive mutation rate for a genetic algorithm im working on. Apart from the aforementioned methods, there also exist quite a few approaches on adaptive phase only nulling using neural network 32 and numerical optimization techniques, such as genetic. Phase only adaptive nulling with a genetic algorithm this paper describes a new approach to adaptive phaseonly nulling with phased arrays. A genetic algorithm adjusts some of the least significant bits of the beam steering phase shifters to minimize continue reading. There is a phaseonly control allowing coherent adding.
The phase excitations of a linear array were optimized for an adaptive nulling via genetic algorithms in 3. An evolutionary method based on backtracking search optimization algorithm bsa is proposed for linear antenna array pattern synthesis with prescribed nulls at interference directions. Overlapped subarray architecture of an wideband phased. Array pattern nulling by phase and position perturbations with the use of the genetic algorithm.
Chu, array pattern nulling by phase and position perturbations with the use of the genetic algorithm, microwave and optical technology letters, vol. Genetic algorithm and its application to big data analysis. A phaseonly adaptive algorithm modifies quantized phase weights based on the arrays total output power. Sensitivity of the adaptive nulling to random errors in amplitude and phase excitations in. The nulling of interferences or jammers impinging on a planar antenna array is addressed by means of an efficient adaptive control strategy based on a genetic algorithm. The control of adaptive antenna using dominance and diploidy. This paper presents a fast iterative method for the synthesis of linear and planar antenna arrays of arbitrary geometry that provides pattern reconfigurability for 5g applications. A method of operating a circular array antenna, butler matrix, phase shifters and beam forming network is described including a control circuit or computer algorithm for modifying the phase of the phase shifters, one at a time, and measuring the output power received or transmitted by the circular array antenna to estimate the gradient of the output power.
Adaptive nulling with spherical arrays using a genetic. That is to say that rfi nulling is limited to phaseonly control. The concept of subarrays and monopulse estimation with arbitrary subarrays is developed. In this paper, enhanced practical swarm optimization epso algorithm is. They are represented by chromosome like data structure which uses recursive recombination or search techniques. Wide null control for linear symmetric antenna array using real coded genetic algorithm.
Haupt, phaseonly adaptive nulling with a genetic algorithm, ieee trans antennas propag 45 1997, 10091015 2. A robust phaseonly direct data domain least squares d 3 ls algorithm based on generalized rayleigh quotient optimization using hybrid genetic algorithm ga is presented in this letter. In 8, the problem of assigning prescribed nulls in the pattern of a linear array by phaseonly control is solved through the development of a genetic algorithm. Amplitude and phase adaptive nulling with a genetic. Cloning is a mitotic process which produces exact copies of the parent cells. Haupt, phaseonly adaptive nulling with genetic algorithms, ieee aps trans.
Pdf array pattern nulling by element position perturbations using. Cancellation patterns are then extracted from adaptive nulling results with a genetic algorithm and a 32 element dipole array model. Interference suppression of linear antenna arrays by phase. As a preparation to adaptive beam forming, which is treated in several other sections, the topic of pattern shaping by deterministic.
A robust phaseonly direct data domain algorithm based on. Phaseonly adaptive nulling with a genetic algorithm colorado. Adaptive mutationcrossover rates for genetic algorithms. Phaseonly adaptive nulling with a genetic algorithm. The problem of interest to us here is the selfadaptive parameters adjustment of a ga. A genetic algorithm adjusts some of the least significant bits of the beam steering phase shifters to minimize the total output power. Pattern nulling is obtained by controlling only the amplitude, position, and phase of the antenna array elements. Figure 6 shows a simple example for a fiveelement array. Noiselike radio source signals are usually much weaker than system noise antenna plus receiver and rfi. When no interference is present, then algorithm minimizes desired signal haupt, 1997. Broad null steering in antenna pattern helps to reduce channel interference due to less energy being transmitted at unwanted directions. A genetic algorithm adjusts some of the least significant bits of the beam steering phase shifters in order. The function value and the derivatives with respect to the parameters optimized are used to take a step in an appropriate direction towards a local.
Such information could be the story of recently received data, information on the available computational resources, or other runtime acquired or a priori known information related to the environment in which it operates. Genetic algorithm optimization of wire antennas 169 6. A ga adjusts least significant bits of beam steering phase shifters minimizing total output power. Haupt rl 1997 phaseonly adaptive nulling with genetic algorithms. Adaptive wide nulling for arbitrary dbf array using. An adaptive, phaseonly genetic algorithm applied to a computer model of a linear. More recently, the availability of enhanced computation facilities has enabled the use of optimization algorithms for recon. Optimizing interference cancellation of adaptive linear. Pdf phaseonly antenna array reconfigurability with gaussian. It is also quite useful as an adaptive algorithm for smart antennas. Chu, array pattern nulling by phase and position perturbations with the use of the genetic algorithm, microwave and optical technology letters. A genetic algorithm is used to place a null at the sidelobe of two types of spherical arrays. The optimization efficiency and computational speed are improved via the hybrid ga composed of standard ga and neldermead simplex algorithms.
In this research, we propose an approach in which the control of a genetic algorithms parameters can be encoded within the. Optimal synthesis of linear antenna arrays using a harmony. This paper describes a new approach to adaptive phaseonly nulling with phased arrays. Ive seen an algorithm which uses the current individuals fitness and the average population fitness to calculate a mutation rate, however im not sure its very effective. In 4, the optimum amplitudes and phases of an array with nonidentical elements for. This paper presents a novel architecture of combining the linear array of antenna elements, where each antenna element has digitally selectable true timedelays as weights. Phaseonly adaptive nulling with neural networks for. This paper describes a new approach to adaptive phase only nulling with phased arrays. This design for radiation pattern nulling of an adaptive antenna can suppress multiple interferences by placing nulls at the directions of the interfering sources, i. Each element of the array is uniformly weighted and the nulling feature is yielded by controlling a set of radiofrequency switches that connect or disconnect the elements from. Adaptive phase only nulling with a genetic algorithm was introduced in 1. Beamforming, radar detection and parameter estimation are described.
The adaptive algorithm is based on a genetic algorithm and uses a limited number of bits of the digital phase shifters. Broad null steering by phase only perturbation using. A genetic algorithm adjusts some of the least significant bits of the beam steering phase shifters in order to minimize the total output power. An adaptive algorithm is an algorithm that changes its behavior at the time it is run, based on information available and on a priori defined reward mechanism or criterion.
A phaseonly null synthesis method for linear arrays is also discussed in 9, where the authors adopt a sequential quadratic programming. Request pdf amplitude and phase adaptive nulling with a genetic algorithm for array antennas this paper researchs an efficient by using the genetic algorithm apply in amplitude and phase to. Experimental adaptive nulling with a genetic algorithm. Phaseonly antenna array reconfigurability with gaussian. Adaptive nulling in thinned planar arrays through genetic. Haupt, phaseonly adaptive nulling with a genetic algorithm, ieee trans. Flow chart of the genetic algorithm used for adaptive nulling. Gharsallah3 1 lebanese university, equipe radiocom, iutsaida liban 2 limoges university. The clonal selection principle, explains how an immune response is mounted when an antigenic pattern is recognized by a bcell. Amplitude and phase adaptive nulling with a genetic algorithm generates deeper and faster nulls than phase only nulling i31. A genetic algorithm adjusts some of the least significant bits of th. Amplitude and phase adaptive nulling with a university of. Pdf phaseonly adaptive nulling with a genetic algorithm.
Adaptive nulling in timemodulated linear arrays with. This section gives a short survey of the principles and the terminology of phased array radar. Phase only adaptive nulling with a genetic algorithm abstract. Haupt, senior member, ieee abstract this paper describes a new approach to adaptive phaseonly nulling with phased arrays. Pdf general synthesis method for linear phased antenna. Simple method for pattern nulling by phase perturbation. Pier b online adaptive nulling with weight constraints.
Our adap tive nulling approach with a ga implementation uses the total output power from the array, rather than the signal at each element, as feed back for placing the null. Nulling of the pattern is achieved by controlling the amplitudeonly, the phaseonly, and the positiononly. Phased array radar with monopulse algorithm measurement us9229100b2 en 20920. Phase only adaptive nulling with a genetic algorithm randy l. An ideal adaptive algorithm for a phased array antenna. Adaptive genetic algorithm with mutation and crossover matrices nga lam law and k. To prevent desired signal degradation, algorithm is turned on at low array signaltointerferenceplusnoise ratios or when nulling phase shifts are. A method based on harmony search algorithm hsa for the pattern synthesis of linear antenna arrays with the prescribed nulls is presented. Adaptive nulling algorithms that minimize the total array output power from the. Phaseonly adaptive nulling with a genetic algorithm randy l. The method enables to generate wide null regions shaped according to a gaussian distribution, which complies with recent measurements on millimeterwave mmwave angular dispersion.
Us4916454a adaptive nulling circular array antenna. Phase only adaptive nulling with a genetic algorithm this paper describes a new approach to adaptive phase only nulling with phased arrays. Their combined citations are counted only for the first article. Use of timedelays for beamformation inherently makes the phased array network a wideband system. Haupt, phaseonly adaptive nulling with a genetic algorithm, ieee transactions on antennas and propagation, vol. Genetic algorithm ga assisted beamforming techniques are proposed as an alternative to conventional beamforming algorithms. Introduction digital beamforming dbf is a rapidly developing technology which is the most advanced.
Genetic algorithms in electromagnetics electromagnetic. Adaptive nulling in thinned planar arrays through genetic algorithms toshifumi moriyama1a, lorenzo poli2b. Amplitude and phase adaptive nulling with a genetic algorithm article in journal of electromagnetic waves and applications 145. The control of adaptive antenna arrays with genetic algorithms using dominance and diploidy. A phaseonly adaptive nulling with a genetic algorithm ga proposed by haupt 8 describes a new approach to phased arrays based adaptive phaseonly nulling. Introduction to multiple beams adaptive linear array using.
Phaseonly adaptive nulling with a genetic algorithm ieee journals. In particular, this technique envisage a new method of sharing antenna elements, by fixed overlapped subarray architecture. Isnt there a simple solution we learned in calculus. In this paper, the pattern nulling of a linear array for interference cancellation is derived by phaseonly perturbations using genetic algorithms. Wide null control for linear symmetric antenna array using.
Ep0096144a1 system for the cancellation of intentional. Bsa is an innovative metaheuristic technique based on an iterative process. Then from a genetic algorithm we can obtain optimal set of recombination and selection on basis of some semantic. The hsa is conceptualized using the musical process of searching for a perfect state of harmony. The genetic algorithm is implemented on a pc that controls the eightelement cylindrical array. Szeto hong kong universityof science and technology department of physics clear water bay, hong kong sar, china corresponding author. Adaptive genetic algorithm with mutation and crossover. The cancellation patterns provide insight into the constraints needed for the successful implementation of a power minimization adaptive algorithm.
Newtonraphson and its many relatives and variants are based on the use of local information. Phase controlling for broad null steering is relative easy realizing comparing with amplitude or elements position. Genetic algorithm optimization of wire antennas 169. Investigations on broad null steering by only phase perturbation are presented in this paper using immune algorithm ia for linear array. Pdf phaseonly adaptive nulling with neural networks for.
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