基于空间频率域滤波的漫反射光大气湍流传输数值仿真方法

在基于目标回光的激光瞄准系统和目标在回路(TIL)系统中都要使用目标照明漫反射回光作为系统工作的基础.数值仿真在研究光波传输特性的过程中一直发挥着重要作用.由于漫反射光场发散角很大,给数值计算带来困难.一般的处理方法是进行分段空间域滤波,但这会大大增加计算量.提出一种计算漫反射光传榆的频率域滤波方法.频域滤波基本不增加...

Numerical Simulation Method of Propagation of Diffuse Reflection Optics Based on Frequency Filtering

Return signals scattered off an object is the basic data source in target-in-the-loop-type systems.In numerical simulation the localization area of the scattered field rapidly expands with propagation distance and reaches the numerical grid boundary a relatively short distance from the object.Generally spatial filtering would be a solution that the propagation path is separated to several parts,and the complex field is multiplied by a masking function after each part propagation.A novel numerical simulation method of propagation of diffused reflection optics is derived.This method is based on frequency filtering that the optical complex field would be filtered in frequency domain before the propagation calculation.The simulation result of the frequency filtering method is consistent with the result of the spatial masking method.Imaging propagations both with and without atmospheric turbulence are simulated using the new method.The imaging resolve angular radius in different situations is found to agree well with the theory analysis.