FOPEN [叶子普及] ATR研究专注于宽带VHF / UHF SAR [合成孔径雷达]图像，用于自动目标识别。叶子普及计划将评估和量化HF / UHF超宽带合成孔径雷达技术通过利用雷达杂乱来定位隐藏的叶子或其他伪装，隐藏或欺骗方法隐藏的目标的能力。例如，200至900 MHz的带宽可能提供合成孔径，高分辨率（下半尺寸尺寸的对象）雷达图像，用于依次识别隐藏在杂波中的目标。这种能力提供了监视日夜，恶劣的天气，以及广泛的环境，从沙漠到丛林。
On February 24, 1997 the U.S. Army Communications-Electronics Command (CECOM), Night Vision and Electronic Sensors Directorate (NVESD), Fort Monmouth, NJ, issued a Market Survey to solicit potential offerors interested in providing engineering design, development, integration and test services in support of a joint Army-Air Force program to develop a Foliage Penetration (FOPEN) Radar to ultimately be deployed on a High Altitude Endurance (HAE) Unmanned Aerial Vehicle (UAV). The FOPEN Advance Technology Demonstration (ATD) program is managed by the Defense Advanced Research Projects Agency (DARPA) in cooperation with the Army and Air Force. The FOPEN ATD program will develop a fully functional ultra wide-band Synthetic Aperture Radar (SAR) to detect, discern and cue tactical users to the presence of man-made metallic objects hidden beneath foliage. The proposed acquisition will be a three to four year contract to develop and integrate the FOPEN sensor into a manned platform for testing. Because of the complexity of the program and to avoid additional risk from a performance, cost and schedule perspective, and unnecessary work effort on the part of potential offerors and the Government, potential offerors should possess resident or demonstrated capabilities in the following areas: SAR systems with near real time image formation, aircraft system integration, and development of automatic target detection and cueing algorithms.