□□“天基雷达”(SBR)计划是美国空军为实施其具有转折性(transformational)空间力量增强战略的一项具体内容。该计划的任务是建造一个由8～10颗雷达成像卫星组成的星座,星上主要有效载荷为合成孔径雷达和活动目标指示器(MTI),旨在为美国分布在全球的武装部队提供实时或准实时 □ The Space-based Radar (SBR) program is a concrete element of the United States Air Force’s strategy of empowering its space forces with transformational space. The mission of this program is to construct a constellation of 8 to 10 radar imaging satellites. The major payloads on the planet are the Synthetic Aperture Radar and Activity-Targets (MTIs), which aim to provide the U.S. armed forces in the world with real-time or Quasi real-time