电视无源双基地雷达低空测距的地面绕射效应研究

本文主要结合电视发射的特点,将无源双基地雷达与常规单、双基地雷达在特定方向上对低空目标的探测进行仿真计算对比;通过电磁波传播过程中的绕射效应对不同雷达探测距离的影响,说明以电视信号为照射源的双基地雷达由于在高度增益和地面的绕射能力上占有独特的优势,而使得比常规单、双基地雷达在超视距探测低空目标时更具有潜在优势;同时也深入研究了高度增益和绕射效应对无源双基地雷达在增加探测距离上所起的决定性作用,提出了在两者的矛盾运动中如何确定最佳工作波长、使探测距离达到最大的有效方法.

A STUDY ON THE DIFFRACTION OF TELEVISION-BASED PASSIVE BISTATIC RADAR RANGING AT LOW ALTITUDES

The paper compares the passive bistatic radar with the conventional monostatic and bistatic radar when detecting targets at low altitude in some given direction and considers the characteristic of television transmitter fully. In the light of the effect of ground diffraction on ranging of different radar, it is shown that the bistatic radar, using a television transmitter as the illuminator has a potential advantage over conventional radar in detecting targets beyond the horizon at low altitude because of particular advantages in height gain and diffracting power. At the same time, an important role that the height gain and diffraction effect play in ranging, is extensively studied, putting forward an effective method of deciding optimal wavelength so as to make the ranging of radar maximal.