Tackling the complexity and inefficiency in the system design of spaceborne terrain observation by progressive scans (TC)PSAR) mode, this paper analyses some beam position design problems unattended before, including the variation of azimuth resolution with slant-range, the effects on azimuth ambiguity to the signal ratio (AASR) of antenna pattern grating lobes introduced by beam steering, and the relationship between timeline and observation efficiency. Then a novel system beamposition design method is presented based on the linear flow, in which the selection of pulse repetition frequency is optimized according to the required AASR. The proposed method adds freedom and avoids iteration, thus improving the efficiency of system design. Finally, the validity of the method is justified by simulation results.%针对星栽合成孔径雷达渐进扫描模式系统波位设计流程复杂、效率较低的问题,首先对星栽合成孔径雷达渐进扫描模式系统波位设计中一些尚未被关注的问题开展研究及论证,包括方位向分辨率随距离向变化的特性、天线方位向偏扫引入栅瓣对方位模糊度的影响以及时序关系同观测效率之间的关系.在此基础上提出线性流程的波位设计方法,该方法根据方位模糊度指标要求对脉冲重复频率进行优化选择,增加了系统设计的自由度,避免了迭代运算的过程,提升了系统波位设计的能力.最后通过仿真验证了本文方法的有效性.
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