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叶簇穿透(FOPEN)雷达是一种用于发现和表征密集叶簇下人为目标及表征叶簇自身的技术手段。这种雷达已经在军事监视和民用地理空间成像方面得到应用。本次讲座分为三大部分:第一部分讲述FOPEN雷达的早期历史,主要讲述战场监视及叶簇穿透雷达的早期试验。其中,某些雷达技术的发展意义重大,支撑探测密集叶簇下面固定和移动目标的能力。这些技术中最重要的部分就是众所周知的相干雷达与数字处理技术。同样重要的是雷达穿透叶簇的量化及其散射损耗影响。第二部分重点讨论了几种军民用FOPEN合成孔径雷达系统及其研究成果。在对每种雷达系统概述过程中还通过举例说明SAR图像及其固定目标探测能力。这一部分还给出了量化极化分集在探测和表征人为和自然目标时的好处。在目标描述与降低虚警方面,极化技术的优势明显。最后讨论了超宽带和超宽角成像技术。第三部分讨论的是多模超宽带雷达最新研究及SAR和动目标显示(MTI)FOPEN系统的设计。重点是设计这些超宽带(UWB)系统的优势和困难,以及实际电磁环境下的工作情况。讲座最后两部分阐述了文献中出现的一些用于未来多模式工作的新技术:探测可辨别低速运动目标的需求;双基地SAR与固定GMTI照射波形的协同工作。
FOPEN radar is a technique used to discover and characterize artificial targets under dense leaf clusters and to characterize leaf clusters themselves. This radar has been used in military surveillance and civil geospatial imaging. The lecture is divided into three parts: The first part describes the early history of FOPEN radar, mainly on battlefield surveillance and leaflet penetration radar early test. Among them, the development of some radar technologies is of great importance, supporting the ability to pinpoint and move targets below the detecting dense leaf clusters. The most important part of these technologies is the well-known coherent radar and digital processing technology. Equally important are the effects of radar penetration through the leaf clusters and their scattering losses. The second part focuses on several military and civilian FOPEN synthetic aperture radar systems and their research results. SAR images and their fixed target probing capabilities are also illustrated by an example of the overview of each radar system. This section also shows the benefits of quantizing polarization diversity in detecting and characterizing human and natural targets. The advantages of polarization technology are evident in the description of the target and the reduction of false alarms. Finally, the discussion of ultra-wideband and ultra-wide-angle imaging technology. The third part discusses the latest research on multimode UWB radar and the design of the FOPEN system for SAR and Moving Targets Display (MTI). The emphasis is on the advantages and difficulties of designing these ultra-wideband (UWB) systems, as well as the performance of the actual electromagnetic environment. The last two sections of the lecture describe some of the new technologies emerging in the literature for future multimode work: the need to detect low-speed moving targets; the cooperation of bistatic SAR with fixed GMTI illumination waveforms.