Research On Array Antenna Failed Elements Correction Method

The array antenna is composed of a plurality of antenna elements,and in the array antenna,the damage of one or more array elements will distort the far-field pattern.In the actual project,the array antenna designed by the algorithm will have some problems such as antenna damage,which will result in the absence of array element here,and then the array radiation pattern will have some adverse effects such as the increase of sidelobe level and the expansion of the first null beamwidth.For the damaged antenna that cannot be repaired in a short period of time,moving or replacing the fixed position of the large antenna will result in heavy workload,time-consuming and difficult operation,etc.It is necessary to use the optimization algorithm to quickly readjust the parameters of the remaining array elements so that the antenna pattern can recover the original requirements as much as possible.In order to ensure the reliable performance of the array antenna system,and based on the optimization of the array antenna pattern,the different influence of failure array elements on array pattern is analyzed.Aiming at the residual array antenna resources after the failure of array element,different optimization algorithms are used to correct the array antenna pattern.The influence of different failure number and position array elements on antenna pattern is analyzed.The linear array antenna model and antenna pattern synthesis is introduced.A line array is taken as an example to simulate the change of antenna pattern and the influence of sidelobe shape on the failure of different array elements.Compare the relationship between maximum sidelobe level and the first null beamwidth.The iterative Fourier algorithm is studied.This paper introduces the specific steps of the algorithm for the optimization of antenna pattern,simulates the linear array synthesis,and optimizes the antenna pattern of the failed array element,and gives a preliminary introduction to the steps of the latter two algorithms to calculate the array factor by FFT.The genetic algorithm and invasive weed optimization are studied and improved in detail,the improved genetic algorithm based on advantage reservation and the invasive weed optimization based on FFT are proposed,and the two improved algorithms are used to correct the failure antenna pattern.This paper introduces the construction of experimental hardware and software environment,experimental data collection and data processing methods.According to the measured data,the performance of the antenna pattern is analyzed under different failure conditions is analyzed.The failure antenna pattern is corrected by two improved algorithms,and the repairing effect of the antenna pattern is analyzed.It is proved that the two algorithms have certain application value in practical engineering.