雷达目标远区角闪烁线偏差与观察距离无关的一般性证明

General proof of observation distance independence of the far-zone angular glint of radar targets

和利用高频区散射中心模型计算目标角闪烁不同,直接从Stratton-Chu积分公式出发给出了目标散射场分量随观察距离的变化关系,并证明在远区近似条件下任意目标的远区角闪烁线偏差与目标观察距离无关,只跟目标本身电尺寸、形状及观察目标方向有关。利用驻相法说明所提方法和散射中心建模方法在高频区的结果是一致的,而所提方法适合在全频带上分析目标角闪烁,更具一般性。最后利用电场积分方程结合矩量法计算了有限大导体平板和有限长导体圆柱的角闪烁线偏差,验证了目标远区角闪烁线偏差与观察距离无关。

Different from the utilizing scattering center model of high frequency region in calculating the angular glint of radar targets, the present paper gives the relations of the scattering field components with the observation distance through the Stratton-Chu integral formula directly. Accordingly, it is proved that the angular glint in far-zone is independent of the observation distance, but is related with the electric size and shape of the targets, as well as the observation direction from the targets. The consistency of the results from the present method and the scatter center model method are derived from the stationary phase method in high frequency region, whereas the present method is general and suitable for the analysis of angular glint in the entire frequency band. In addition, combined electric field integral equation （EFIE） with moment method （MOM）, the radar cross section（RCS） and linear angle errors of the finite conducting plate and finite conducting cylinder are simulated, the results validate the characteristic of the linear angle error from the Stratton-Chu formula.