低空小目标容易被地物杂波和噪声淹没,影响雷达的探测性能,对国土防空具有较大威胁.星载双基地雷达因其覆盖范围广、相参积累时间长、不受地形遮挡影响等优点,在低空小目标探测方面具有独特优势.本文提出了一种基于地球同步轨道合成孔径雷达(GEO SAR)的双基地雷达探测系统；在GEO SAR卫星照射、地面(或飞艇)接收的系统配置下,研究了接收机作用距离与双基地角和接收天线面积的关系；并就长时间相参积累、多路径干扰抑制、时间同步与相位同步以及波束扫描与波束管理等关键技术进行了讨论,给出了初步的解决方案.%Small targets moving at low altitude are great threatens to national air defense, and in this case radars usually have poor performances because of the strong clutter and low Signal to Noise Ratio (SNR). However, Space-bome bistatic radar has special advantages in detecting such kind of targets because of large coverage and long integration time and so on. In this paper, a kind of bistatic radar based on Geosynchronous (GEO) SAR was proposed, which used GEO SAR as the transmitter and put the receivers on the ground or on the airship. The relationship between receiving range and bistatic angles as well as receiving antenna area was studied, and the key technologies were discussed, including long time integration, and multipath interference suppression, and time and phase synchronization, and beam scanning and so on. Finally, preliminary solutions were given aiming to these key technologies.
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