考虑弹体旋转情况下的四元红外探测系统仿真

Simulation of Four-element Infrared Detection System Considering Missile Spinning

为了准确分析四元红外探测系统跟踪电路的输出信号,为导弹导引头的跟踪和抗干扰算法提供准确的计算依据,分析该系统的工作原理,在考虑弹体旋转的情况下仿真四元红外探测系统与圆锥扫描相结合产生的目标图像轨迹。以某型便携式防空导弹为例,分析四元红外探测系统在有干扰和无干扰两种情况下的信息信号和目标捕获信号,在此基础上完成脉冲模拟跟踪和数字跟踪电路的信号仿真,开发四元红外探测系统的仿真软件。仿真实验结果表明:如果不考虑弹体旋转、直接仿真四元探测系统输出信号,则四元红外探测系统输出信号仿真结果会导致后期的跟踪电路输出信号仿真结果出现误差;当四元红外探测系统视场中只有目标像斑时,探测器输出可以准确地捕捉目标并计算其方位信息,当有干扰像斑时目标捕获信号输出异常;脉冲模拟跟踪电路和数字跟踪电路都可以计算目标的方位信息,但脉冲模拟跟踪的实现更为复杂。

To precisely analyze the output signal of tracking circuit in a four-element infrared detection system and provide an accurate computational basis for the guidance and anti-jamming algorithms,this paper delves into its operational principle.Considering the missile spinning,the target image trajectory generated by combining the four-element infrared detection system with conical scanning is simulated.The information signals and target acquisition signals of four-element infrared detection system with and without interference are analyzed by taking a man-portable air defence missile as an example.Based on these findings,the signal simulations of pulse analog tracking and digital tracking circuits are accomplished,and a simulation software for the four-element infrared detection system is developed.Through simulation experiments,it is discovered that the direct simulation of output signal from four-element detection system without taking into account the missile spinning leads to the errors in the output signal simulation results of tracking circuit.When there's only a target spot in the detector's field-of-view,the target can be accurately captured and and its azimuth information is calculated from the detector output.However,when the interference spots present,the target acquisition signal output becomes abnormal.Both pulse analog and digital tracking circuits can compute the azimuth information of target,but the pulse analog tracking implementation is more intricate.