Advantages of non-uniform linear arrays based on COTS elements in passive radar applications

J. Rosado-Sanz, N. Rey-Maestre, D. Mata-Moya, M. Jarabo-Amores, M. Rosa-Zurera, J. Bárcena-Humanes
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引用次数: 2

Abstract

One of the advantages associated to the use of passive radars is the lower development and maintenance costs with respect to active ones, mainly related to the absence of a dedicated transmitter and to the possibility of using COTS components. In this paper, a study of the advantages of using Non Uniform Linear Arrays (NULAs) for the design of the antenna system for a passive radar exploiting DVB-T signals is carried out, considering as a basic requirement the use of commercial antennas. Commercial solutions are not designed for being used as single radiating elements in array configurations, so directivity and physical sizes are not the most desirable for array design. In Spain, the use of horizontal polarization includes additional constraints to inter-element distances, and usually gives rise to grating lobes. NULAs designed using optimization techniques for maximizing directivity and controlling side lobes levels are analyzed and compared to Uniform Linear ones (ULAs), proving the better performance of the NULA based spatial filtering. For a selected commercial antenna, performances of NULAs and ULAs are compared as a function of the number of elements, showing a better improvement as the number of elements increases. For completing the study, the single radiating element is redesigned for reducing the physical size maintaining the radiation properties, although the cost associated to this new design is clearly higher than the first one. Results show that NULAs with smaller elements give a better performance in terms of Side Lobe Level (SLL).
基于COTS单元的非均匀线性阵列在无源雷达中的应用优势
使用无源雷达的优势之一是与有源雷达相比,其开发和维护成本较低,这主要与无专用发射机和使用COTS组件的可能性有关。本文在考虑商用天线作为基本要求的情况下,对利用DVB-T信号的无源雷达天线系统设计中使用非均匀线性阵列(NULAs)的优点进行了研究。商业解决方案并不是为在阵列配置中用作单个辐射元件而设计的,因此指向性和物理尺寸并不是阵列设计中最理想的。在西班牙,水平偏振的使用对元件间距离有额外的限制,并且通常会产生光栅瓣。分析了利用最优化技术设计的NULA,并将其与均匀线性滤波器(Uniform Linear ones, ULAs)进行了比较,证明了基于NULA的空间滤波具有更好的性能。对于选定的商用天线,将nula和ula的性能作为单元数的函数进行比较,随着单元数的增加,性能得到了更好的改善。为了完成研究,对单个辐射元件进行了重新设计,以减小物理尺寸,保持辐射性能,尽管与这种新设计相关的成本明显高于第一个。结果表明,单元较小的nula在旁瓣电平(SLL)方面具有较好的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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