基于PO算法的风电机塔架RCS快速求解

对于工作在GHz频率下的电大尺寸风电机雷达散射截面(RCS)求解,传统采用的物理光学(PO)算法所需计算资源极为庞大,难以在风电机对雷达信号干扰评估的实际工程中进行应用。为减少求解占用的计算资源,本文提出了一种快速求解算法,即将风电机RCS求解分为两个部分:仍采用PO法计算叶片RCS;但采用近似法快速求解塔架RCS。计算时,将风电机塔架分割为一系列小的圆柱段,分别求解各独立圆柱段RCS,最后将各部分RCS进行叠加即可获得整个塔架RCS的计算公式。以Vestas V82风电机为例,结果表明采用快速求解算法计算得到的风电机RCS极大值偏差最大为3.15d Bsm,全局极值最大相对偏差为5.14%,但计算资源减少88%。

Fast algorithm for solving wind turbine tower RCS based on physical optics

For the electrically large size wind turbine ( WT) operating at GHz frequency, the computational work-load of WT RCS increases sharply using the Physical Optics ( PO) method. Thus, the PO method can not be used in practical engineering for assessing WT interference with the radar signal. In order to reduce the computational workload, a fast algorithm is proposed by this paper, namely, the calculation of WT RCS is divided into two parts:the blades RCS is calculated using the PO method and the tower RCS is calculated using an approximation algo-rithm. This algorithm is developed by segmenting the WT tower into several small cylindrical sections, then solving each cylindrical section RCS independently. Therefore, the calculation equation of the whole WT tower RCS is ac-quired based on the superposition of RCS from each cylindrical section. Using a Vestas V82 WT as an example, this paper will demonstrate both PO algorithm and fast algorithm for calculating WT RCS. By comparing the results, it can be shown that the maximum deviation is 315dBsm, and maximum error is 514%. Nevertheless, the com-putational memory can be reduced by 88%.