Research On The Setting Method Of Time-gate Width For Laser Seeker

With the continuous development of laser guidance technologies,the guidance accuracy is improving everyday.Of all these technologies the semi-active laser-guided is the most widely used one.Therefore,it's a research hotspot in anti-jamming the semi-active laser-guided weapon.This paper mainly analyses the basic working principle of semi-active laser guidance,the probability of receiving guidance and interference signals and how to optimize the time-gate width of laser seeker.It is of great significance to improve the anti-interference ability of laser seeker.According to the semi-active laser-guided weapon working process,the operating principle of laser seeker range gate is analyzed,laser coding technology is introduced briefly and the time-gate and time-gate width models are also established at the same time.The influence of pulse interval error on the gate setting of laser seeker is analyzed.Several relationships are studied which includes the probability of interference signal being recorded by the gate and the width of leaded interference signal,the pulse interval error of guidance laser signal,the pulse interval error of interference laser signal and the gate width.The influence of different gate width on the practical application of laser semi-active guidance system.Considering the real-time gate,control strategy about time-gate for laser seeker in different operating process is investigated,two methods for optimizing the width of time-gate are proposed,namely symmetric shrinkage method and asymmetric shrinkage method(also known as biased shrinkage method).The advantages and disadvantages of several shrinkage methods under different conditions are compared and analyzed through simulation,and suggestions on the width setting of time-gate are put forward.The investigative results can be applied to study the self-adaptive shrinkage algorithm in-depth for semi-active laser seeker,the studying results will be helpful for reducing the jamming probability and is beneficial to increase the tracking effectiveness about laser seeker.