基于 FAST 和 SOBOL 指数法的雷达系统效能敏感性分析

In order to rapidly improve the comprehensive efficiency of the air detection radar system at a low cost, the evaluation index system of the comprehensive efficiency is firstly establised, and then the establishment of the comprehensive effectiveness evaluation model is completed. Two global sensitivity analysis methods, including Fourier amplitudes sensitivity test (FAST) and Sobol index method based on variance principle, are selected to conduct sensitivity analysis on the established evaluation model from the perspectives of frequency domain and time domain respectively. In the sensitivity analysis based on FAST, the method of selecting the eigenfrequency set corresponding to the 21-dimensional input index is proposed. In the sensitivity analysis based on Sobol index method, the effects of the second-order and higher-order sensitivity indexes are considered. By comparing the analysis results of FAST and Sobol index method, it can be seen that the sensitivity analysis results obtained by the two methods have good consistency. Among them, power and frequency are the main influence indicators of the air detection radar, which can provide the reliability basis for the development and upgrade of the radar system.