由角噪声及目标闪烁引起的比例导引制导误差研究

Study of proportional navigation guidance error caused by angular noise and glint effect

研究了雷达导引头接收机中的角噪声(热噪声)以及目标闪烁对比例导引制导精度的影响。首先根据实际问题的物理意义建立比例导引制导系统模型。考虑到角噪声的带宽远远大于系统带宽,认为角噪声实质上是白噪声;认为低频目标闪烁近似于白噪声通过一阶惯性环节所得到的有色噪声。仿真结果证明,由角噪声以及目标闪烁引起的制导误差与导引头动力学特性和自动驾驶仪动力学特性密切相关;当制导时间较长时,由角噪声引起的脱靶量基本上与制导时间无关,采用频率捷变技术可以有效地降低目标闪烁对制导误差的影响。

The proportional navigation （PN） guidance error caused by angular noise （thermal noise） and glint effect in radar seeker receiver is studied. According to actual problems, a model of the PN guidance system is established. Considering the bandwidth of the angular noise is much large than the system bandwidth, so it is convenient to regard the angular noise as white noise. Also the low frequency glint is regarded as the white noise having passed through a first order filter. Simulation results demonstrate that the guidance error caused by an- gular noise and glint effect has a direct bearing on the dynamic characters of the seeker and autopilot. When the guidance time is longer, the miss distance due to angular noise has no relationship with guidance time. And there is a well-known technique called frequency agility which can be used to reduce the guidance error due to glint effect.