Performance of proportional navigation law for terminal laserguided projectile

By analyzing the proportional navigation guidance plane geometry and principle of the terminal laser-guided projectile,the working principle of terminal laser-guided projectile were studied.Then the loop model of terminal laser-guided projectile proportional navigation law including a nonlinear-procession laser-gyro stabilized dynamic seeker and a linear airframe was established.Especially,focusing on whether guidance and control system used the seeker' s nonlinear procession signal as the guidance command,two kinds of system models were derived.The performance analysis and comparison of the two guidance and control system models was accomplished through the simulation of terminal laser-guided projectile proportional navigation loop with different guidance time and body parameters.At last,focusing on the problem that the body attitude may sway largely by using the nonlinear procession,an improved guidance scheme adding an attenuation coefficient for terminal laser-guided projectile guidance and control system was presented for the case of limited guidance time.