Bistatic VHF and UHF SAR for urban environments
Bistatic VHF and UHF SAR for urban environments
复制标题
DOI：
10.1117/12.719700
复制
发表时间：
2007-04
期刊：
影响因子：
--
通讯作者：
J. Rasmusson;Martin Blom;B. Flood;P. Frölind;A. Gustavsson;T. Jonsson;B. Larsson;G. Stenström;L. Ulander
中科院分区：
文献类型：
--
作者：
J. Rasmusson;Martin Blom;B. Flood;P. Frölind;A. Gustavsson;T. Jonsson;B. Larsson;G. Stenström;L. Ulander
双基地合成孔径雷达（SAR）能够实现新的国防以及环境应用，其中可以利用双基地反射率的特性。用微波系统获得的实验结果已经被报道，但使用较低频率（<1GHz）的报道不多。FOI多年来一直活跃在这部分电磁频谱中，开发并运行了两个机载合成孔径雷达传感器，即CARABAS-II（20-90 MHz）和最近的LORA（200-800 MHz）。2006年期间，开始了实验工作，以调查实施双基地低频合成孔径雷达系统的挑战。在实验室中进行了各种同步测试，为首次双基地VHF SAR数据配准做准备。林雪平市附近的一个地区使用CARABAS-II作为机载发射器和LORA雷达电子设备作为固定的屋顶安装接收器单元进行照明。后者被重新配置为能够处理20-90 MHz的频率间隔。大约4.1公里乘4.1公里的大型普通雷达场景包括城市环境、开阔地区和森林部分。CARABAS-II传感器同时记录单基地SAR数据，以便于通过比较进行图像解释，尽管接收时的入射角差异很大。
Bistatic synthetic aperture radar (SAR) enables new defense as well as environmental applications where the characteristics of the bistatic reflectivity can be exploited. Experimental results obtained with microwave systems have been reported but not much is published using lower frequencies (<1GHz). FOI has been active in this part of the electromagnetic spectrum for many years with the development and operation of two airborne SAR sensors, i.e. CARABAS-II (20-90 MHz) and more recently LORA (200-800 MHz). During 2006 experimental work was initiated to investigate the challenges of implementing a bistatic low frequency SAR system. Various synchronization tests were made in the lab as a preparation for the first bistatic VHF SAR data registrations. An area in the vicinity of Linkoping city was illuminated using CARABAS-II as the airborne transmitter and the LORA radar electronics as a stationary roof-top mounted receiver unit. The latter was reconfigured to be able to handle the frequency interval 20-90 MHz. The approximately 4.1 km by 4.1 km large common radar scene contains urban environments, open areas and forested parts. The CARABAS-II sensor simultaneously registered monostatic SAR data to facilitate the image interpretation by comparisons although the incidence angle on receive differs considerably.