激光角度欺骗干扰中自然地物假目标选择研究

针对激光角度欺骗干扰中自然地物假目标应用需求，在分析了干扰能量传输和干扰过程中武器威胁角、地物倾角以及入射角、反射角等角度关系的基础上，建立了自然地物假目标干扰能量分布模型。依据所建立的模型，对砂石类和建筑类地物反射干扰能量分布进行了仿真研究。仿真结果表明，在相同功率激光照射的条件下，地物倾角相同时对相同位置的激光制导武器，砂石类地物比建筑类地物干扰效果好，在实际防护中砂石类地物选择优先级要高于建筑类地物；同一种地物反射的干扰能量随地物倾角的增大而增大；对于漫反射特性较好的建筑类假目标，威胁角一定时，地物倾角在大致与威胁角互余时反射能量达到最大；对于砂石类目标，存在随入射角大小变化的镜像反射分量，使得导引头接收到地物反射能量达到最大值时威胁角和地物倾角不满足互余关系。进一步研究了在导引头接收到的砂石类地物反射能量最大值时地物倾角和武器威胁角的关系，通过数据分析，得到在实际防护过程中，砂石类自然地物的倾角选择要至少大于31°的结论。根据地物倾角和威胁角关系的散点图特征，分别采用一阶、二阶、三阶、四阶多项式对二者进行拟合，在充分考虑函数复杂度、拟合性能的前提下，确定三阶多项式为最佳拟合函数。在武器威胁角已知的情况下，可以通过三次多项式拟合得到最佳干扰效果时砂石类自然地物的倾角取值。研究结果对自然地物假目标的选择具有一定的指导意义。

Research on the Selection of False Targets of Natural Objects in Laser Angle Deception Jamming

Aiming at the application requirements of natural objects as false targets in laser angle deception jamming, based on the analysis of the energy transmission of jamming and the relationship between the weapon threat angle, ground object inclination, incident angle and reflection angle in the jamming process, the energy distribution model of natural object false target established. Based on the established model, the simulation study on the disturbance energy distribution of sand and gravel and building features is carried out. The simulation results show that under the condition of the same power laser irradiation and the same inclination angle of the ground features, the interference effect of the sand and gravel features on the laser-guided weapons at the same position is better than that of the buildings. In actual protection, the selected sand and gravel features are higher priority than architectural features. The interference energy reflected by the same kind of feature increases with the inclination of the features. For false architectural targets with better diffuse reflection characteristics, when the threat angle is constant, the reflected energy reaches the maximum when the inclination of the features is approximately complementary to the threat angle; for sand and gravel targets. There is a mirror reflection component that varies with the incident angle so that when the seeker receives the ground object’s maximum reflection energy, the ground object’s threat angle and the inclination angle are not satisfied mutual relations. The relationship between the inclination angle of the sand and gravel objects and the weapon threat angle at the maximum reflected energy received by the seeker is further studied. Through data analysis, the choice of the inclination angle of the sand and gravel natural objects in the actual protection process is obtained. The conclusion must be at least greater than 31°. According to the characteristics of the scatter plot of the relationship between the inclination angle of the ground object and the threat angle, the first-order, second-order, third-order, and fourth-order polynomials are used to fit the two respectively. Under the premise of fully considering the function complexity and fitting performance, determine the third-order polynomial is the best fitting function. When the threat angle of the weapon is known, the inclination angle of sand and gravel natural objects can be obtained through third-order polynomial fitting to obtain the best interference-effect. The research results have a certain guiding significance for selecting false targets of natural features.