摘要:
改善基阵方向性的方法很多。但以前提出的各种方法都难于解决一个矛盾:即缩窄主瓣必然使旁瓣增大,或者相反,降低旁瓣必然使主瓣增宽,因此要降低方向性指数。本文提出一种时间—空间综合处理的方法,形成改进因子,做到既缩窄主瓣又降低旁瓣,提高方向性指数。根据这种方法,文中计算了基元数为16和32的两种情况。计算表明,在降低旁瓣的同时,主瓣明显变窄,方向性指数可以提高1.5dB至2.5dB。文中还说明,这种方法也适用于在宽频率范围内主瓣扫描的情况。
Abstract:
There are many methods to improveg array directivity. However, different methods developed before are difficult to resolve the following paradox: To narrow the main lobe will surely increase side lobes. On the other hand, to reduce side lobes will widen the main lobe, and hence, reduces the directional index. This paper develops a time-space synthesis process by forming an improving factor. The method could be used both to narrow main lobe and to reduce side lobes, and therefore to increase directional index. Using this method, two cases （16 elements and 32 elements） were calculated. The results show that the side lobes are reduced and the main lobes are narrowed at the same time. Thus the directional index is increased from 1.5 dB to 2.5dB. This paper shows) that thel method is also useful for sweeping of main lobe in wide frequency band.
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