舰载机进近减速运动及下滑速度的双站测量

Retarded Motion in Approach and Glide Speed Measurement with Two-Stations for Carrier Aircraft

应用多普勒频移分析了舰载机进近下滑时的运动规律,证明在匀速下滑时,由多普勒变化率为零的条件即能得出比例导引律;证明了在等比减速下滑时相邻多普勒变化率是近似相等的.然后,基于舰载机进近下滑是一个减速运动的事实,提出了在运动平台上实时探测舰载机进近下滑角和下滑速度的工程方案.与现有的多站测量方式不同,通过利用测向所引入的角度,由多普勒频移方程即可在位置参数未知时直接导出求解舰载机速度矢量的解析式.误差分析表明,如能使航母的速度测量误差均方根小于0.1 m/s,则速度测量误差就能小于0.1 m/s.

The motion law in approach for carrier aircraft was analyzed by applying Doppler shift.When carrier aircraft is in uniform glide motion,the proportional navigation guidance law can be derived according to the condition that Doppler changing rate tends towards zero.Then,the retarded motion at equal proportion is emphatically researched and the conclusion is obtained that adjacent Doppler changing rate tends to equal.Based on the fact that the approach for carrier aircraft must be practically a retarded motion,this paper presented an engineering solution detecting glide angle and velocity of carrier aircraft in mobile platform. As opposed to the available multistation measurement mode,the analytic equation of velocity vector of carrier aircraft from Doppler shift equation can be directly derived making use of angle transformation introduced by direction-finding although the location parameter is unknown.The analog calculation verifies that the derived formula of velocity vector is errorless.The error analysis shows that the measuring error of velocity vector is less than 0.1 m/s if the rms value of measurement error of the velocity for aircraft carrier is less than 0.1 m/s.