| Phased array antenna is a type of antenna that can change the shape of the pattern by controlling the feeding phase of the radiation element in the array antenna.Among them,the active phased array antenna has been developed rapidly due to its advantages of multi-target,long distance,high reliability and high adaptability.During the manufacture of active phased array antennas,manufacturing errors such as feeding errors,material defects,and dimensional deviations will be produced.These errors will have a certain impact on the electromagnetic performance of the antenna,and even lead to the deterioration of system performance indicators.In terms of this issue,The influence of manufacturing error uncertainty on the electromagnetic performance of active phased array antenna is studied.The research focuses on two scientific issues.One is that the traditional Monte Carlo simulation method is not suitable for analyzing the electromagnetic response range of passive microwave devices because of its expensive time cost;Secondly,the composition of phased array antenna system is complex.How to analyze the influence of manufacturing error of each part of the system,such as power division network,transmitting/receiving components and antenna array surface on its electromagnetic response,and comprehensively consider the influence of manufacturing error on the whole antenna array pattern.In order to solve the above problems,an algorithm based on model reduction and Monte Carlo simulation is proposed to analyze the uncertainty of electromagnetic response of passive microwave devices;On this basis,the variation range of phased array pattern is analyzed with interval analysis algorithm.The specific research work of this paper is as follows:(1)In this paper,an algorithm is proposed to build a reduced order model for the electromagnetic response of passive microwave devices.In order to save software simulation time,a parametric reduced order model of electromagnetic response is established using Proper Orthogonal Decomposition and Gaussian process to quickly calculate the electromagnetic response under different manufacturing design parameters.This method can be applied to both antenna and passive feeder analysis,and it can analyze electromagnetic performance such as pattern and scattering parameters.The implementation process of the algorithm is described in detail,and numerical test examples,antenna element and power division networks are used to verify the proposed algorithm.The results show that the proposed method can establish a high-precision electromagnetic simulation mathematical model and can replace the time-consuming software simulation.(2)A parallel adaptive sampling algorithm is proposed to improve the accuracy of the reduced order model.This paper proposes a parallel adaptive sampling algorithm based on Voronoi diagram.This algorithm can adaptively select multiple points in each iteration,and the parallel technology of computer is used for simulation calculation.When the accuracy of the reduced order model converges,Monte Carlo simulation is performed to complete the uncertainty analysis.Applying the proposed algorithm to the analysis of manufacturing errors of two types of antennas and power division networks,and processing one type of antenna for experimental verification,the results show that the proposed algorithm can save about 14?110 times the simulation time for three engineering examples while ensuring the accuracy of the results.The effectiveness and efficiency of the proposed method are verified.(3)A method to analyze the influence of manufacturing error uncertainty on the array pattern of the active phased array antenna is proposed.Based on the reduced-order model and Gaussian process,this method combines the interval analysis algorithm to analyze the uncertainty of the active phased array antenna array pattern.Firstly,the array pattern of the whole system is characterized,and then the previously proposed algorithm is used to model and analyze the electromagnetic response of the power division network,transmitting/receiving components and antenna front in the whole system,and then the interval analysis algorithm is used to deduce the variation range of the array pattern.Finally,the effectiveness of the proposed method is verified by analyzing a four-channel active phased array antenna.(4)A set of uncertainty analysis software for active phased array antenna electromagnetic response was developed.Based on the uncertainty analysis algorithm proposed in this paper,a set of uncertainty analysis software is developed using C++ and Matlab software platforms,and the algorithm in this paper is better applied to engineering analysis. |
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