【摘要】 针对地球同步轨道合成孔径雷达(GEO SAR)的对地观测需求,同时考虑到发射等其他因素的影响,基于GEO SAR天线的面积以及功率约束分析,在一定的系统参数下,设计了一种将数字波束形成(DBF)技术与反射面技术结合起来的天线。该天线在俯仰向采用DBF可以降低系统对于脉宽的限制,从而降低峰值发射功率;在方位向采用DBF可以减小系统实际工作的脉冲重复频率(PRF),增大测绘带宽。该设计方法为未来GEO SAR天线的发展提供了理论参考。更多还原

【Abstract】 To meet the earth observation demands of the geosynchronous earth orbit synthetic aperture radar( GEO SAR) and take other factors such as the launch into consideration,a possible antenna form,which combines the technology of digital beam forming( DBF) with reflector,is presented based on the analysis of the antenna size and power of GEO SAR under certain parameters. DBF in elevation lowers the system restrictions on pulse-width,so the transmitting peak power is decreased. DBF in azimuth reduces the system operation pulse repetition frequency( PRF),thus the swath width is enlarged. The design method provides theoretical reference for the development of GEO SAR antenna in the future.更多还原