“沙漠之狐“中的新式武器

在“沙漠之狐”行动中空中打击依靠激光制导武器和巡航导弹,而Ｂ－１战略轰炸机首次执行了作战任务。     

宽带微带贴片天线述评

近几年微带贴片天线已受到人们的极大关注,但是,该天线固有的窄频带特性是它的主要缺点之一。同样,西方也介绍了自ＭＰＡ的最新报道以来一直在研究的能提高贴片天线频带宽度的新颖设计方法。     

相控阵的主要进展:第一部分

本文为介绍相控阵主要成就的两部分系列文章中的第一部分。在过去３５年,电可控相控阵,（即可在两维空间扫描的阵列,在未来将会取得更大的进展。本文主要介绍美国在该介绍方面的一些重要进展。在过去十多年时间是相控阵技术的研制遍布全世界,并神奇地进入大量地面和飞机平台应用的有源ＭＭＩＣ相控阵的新时代。     

相控阵的主要进展:第二部分

本文是两部分系列介绍的第二部分,介绍了相控阵和新时代ＭＭＩＣ地基和机载阵列的主要成就。第一部分论述了过去３５年相控阵的重大进展,以有有源ＭＭＩＣ相控阵用于地面和机载系统进入了新时代。第二部分介绍进入空间时代远程通信－ＩＲＩＤＩＵＭ,Ｇｌｏｂａｌｓｔａｒ以及潜在的Ｔｅｌｅｄｅｓｉｃ系统的ＭＭＩＣ阵列。     

Impact of atmospheric turbulence on coherent beam combining for laser weapon systems

The performance of a laser weapon system based on coherent beam combining (CBC) depends on its propagation properties in the atmosphere. In this study, an analytical model based on partial coherent beam combining (PCBC) for assumed coherence coefficients between beams in a CBC lattice was developed. The Kolmogorov model of atmospheric turbulence and the Hufnagel-Valley model of Cn2 dependence on atmospheric parameters were implemented. Novel simplified metrics were proposed to assess the CBC performance. Several beam profiles (super-Gaussian, truncated Gaussian, etc.) and ge-ometries were analyzed in terms of maximal intensity in the far field. An approximate formula for PCBC efficiency dependent on the Fried radius was proposed. The results of CBC modeling were compared to those of the Gaussian beam propagation model in a turbulent atmosphere. The dependence of CBC performance on the Cn2 parameter, range, and elevation angle was analyzed. It could be concluded that the application of CBC for medium and long range propagation is impractical without an effective adaptive optics system.