远旁瓣引起的杂波干扰

THE CLUTTER INTERFERENCE CAUSED BY FAR SIDE-LOBES

分析了偏角馈入抛物面天线远旁瓣回波产生的机理，并经实验验证了远旁瓣回波的存在。结论显示：偏角馈入抛物面天线较中心馈入抛物面天线在抑制远旁瓣方面有优势，在做低仰角扫描时不会产生远旁瓣回波；但在高仰角时，也会产生远旁瓣回波。在多卜勒雷达的使用中，控制天线的转速有利于消除远旁瓣回波的影响。

The generation of far side lobe echoes for offset parabolic antenna is analysed in this article,and the experiments have proved the existence of far side lobe echoes.It is concluded that an offset feed parabolic antenna has the advantage in side lobe suppression over central feed parabolic antenna.An offset antenna won't generate far side lobe echoes when scanning in low elevation angles,but when the angles turn high,it will.In the application of Doppler radar,controlling the rotation speed of antenna is helpful in eliminating the effect of far side lobes.