降雨对毫米波多普勒引信的影响分析

Analysis of the Effects of Rainfall on Millimeter Wave Doppler Fuze

降雨对毫米波引信多普勒频率影响的分析对于采用多普勒信息作为近炸或碰炸判据的毫米波引信的开发和应用具有重要的实际意义。文中分别给出了弹目交会过程中不同脱靶量时的运动目标或降雨产生的多普勒频率随交会到达时间或距离变化的计算结果。通过分析可看出,在一定脱靶量的情况下,当弹目交会距离较远时,目标和降雨雨滴产生的多普勒频率差较显著;随着交会距离的逐渐减小,多普勒频率差别逐渐减小,特别在引信作用和起爆的近距离处,约30米内,降雨的多普勒频率和目标的多普勒频率逐渐混叠在一起,会对目标的多普勒信号产生较大的影响。那么,对于较宽的脉冲波束、大降雨量或较小目标的情况,降雨的影响会更大,必须要考虑。

The analysis of the influence of rainfall Doppler frequency clutter on the Doppler performance of MMW fuze is significant for the exploiture of the MMW Doppler fuze by using the Doppler information as the criteria of the proximity or touch detonating.In present paper,the relationships of the Doppler frequencies caused by target or rainfall with the time or the distance to arrive at the miss-point in the encounter course of missile and target are presented for different miss-distance at 35 and 95GHz, respectively.The influences of rainfall on target Doppler frequency are analyzed.The results show that the distance between fuze and target is less than about 30m,the difference between the rain Doppler frequency and the target Doppler frequency decrease gradually with the distance decreasing.The influences of rain Doppler clutter on target Doppler information become gradually bigger with the distance approach and rainfall increase,and need be considered for the application of a MMW Doppler fuze, especially,for stronger rainfall,a smaller target and a wider fuze radar beam.