干扰条件下制导波门对激光信号录取的数学仿真

波门是激光制导中广泛采用的一种抗干扰措施,其对干扰信号录取概率的大小对干扰成功与否非常关键。依据制导信号与干扰信号在波门内既相互联系又相互独立的特点,提出可用干扰信号与制导信号的联合概率密度函数描述干扰条件下波门对激光信号的录取,同时需要考虑干扰信号对实时波门的牵引作用。运用Matlab软件仿真了不同宽度的实时波门录取干扰信号的概率与超前同步时间的关系,表明对宽度一定的实时波门存在一个最佳的超前同步时间;超前同步时间为零时,波门录取干扰信号的概率接近于0.5,而不是接近于1;波门越宽、干扰设备的时间精度越高,干扰信号就越容易被波门录取;波门受到牵引后其对干扰信号的录取概率增加,而波门宽度的影响不大。在此基础上,用Monte-Carlo法对一次制导过程中波门对制导信号与干扰信号的录取以及多次制导中导引头跟踪真假目标的结果作了模拟,这可为建立对激光半主动制导武器干扰效能评估系统打下基础。

Mathematics simulation of laser signal extraction in guidance range gate under jamming

Range gate is an usual anti-jamming technology for laser guidance. Extraction probability of laser jamming signal in range gate is very important to successful jamming. According to the connection and independence between jamming signal and guidance signal in range gate, it was put forward that the joint probability density function was compatible with laser signal extraction in range gate under jamming. The effect of jamming signal in range gate pull off was thought about. The quantitative relation between extraction probability of jamming signal and advance-synchronizing time was simulated in different width range gate by calculational software Matlab. The results show that there is an optimal advance-synchronizing time for a real-time range gate of which width is fixed. Extraction probability of jamming signal is 0.5, not 1.0, when advance-synchronizing time is zero. The jamming signal is easy to be extracted by range gate when the timing of jamming devices is good or the range gate is wide. Jamming signal extraction probability increases and the width of range gate is insignificant after the range gate is pulled off. The results of laser signal extraction in range gate during once guidance process and tracking target or false target during repetitious guidance process were simulated by Monte-Carlo. It is beneficial to the construction of assessment system of effectiveness about angle deception jamming.