Blanche Pierre-Alexandre, Neifeld Mark, Peyghambarian Nasser
College of Optical Sciences, University of Arizona, 1630 E University Blvd., Tucson, AZ, 85721, USA.
Sci Rep. 2017 Dec 19;7(1):17767. doi: 10.1038/s41598-017-18131-1.
The radar cross section of an object is an important electromagnetic property that is often measured in anechoic chambers. However, for very large and complex structures such as ships or sea and land clutters, this common approach is not practical. The use of computer simulations is also not viable since it would take many years of computational time to model and predict the radar characteristics of such large objects. We have now devised a new scaling technique to overcome these difficulties, and make accurate measurements of the radar cross section of large items. In this article we demonstrate that by reducing the scale of the model by a factor 100,000, and using near infrared wavelength, the radar cross section can be determined in a tabletop setup. The accuracy of the method is compared to simulations, and an example of measurement is provided on a 1 mm highly detailed model of a ship. The advantages of this scaling approach is its versatility, and the possibility to perform fast, convenient, and inexpensive measurements.
物体的雷达散射截面是一项重要的电磁特性，通常在电波暗室中进行测量。然而，对于诸如船舶或海杂波与地杂波等非常大且复杂的结构而言，这种常规方法并不实用。使用计算机模拟也不可行，因为要对如此大型物体的雷达特性进行建模和预测需要耗费多年的计算时间。我们现已设计出一种新的缩放技术来克服这些困难，并对大型物体的雷达散射截面进行精确测量。在本文中，我们证明通过将模型尺寸缩小100,000倍，并使用近红外波长，可以在桌面装置中确定雷达散射截面。将该方法的精度与模拟结果进行了比较，并给出了在一个高度精细的1毫米船舶模型上的测量示例。这种缩放方法的优点在于其通用性，以及能够进行快速、便捷且低成本测量的可能性。
