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星载扫描合成孔径雷达(SCANSAR)利用距离向波束扫描实现大幅宽成像,波位切换会导致前一波束的多个周期回波信号的丢失,造成SCANSAR模式系统性能下降.文中首先分析波位切换造成回波丢失的机理以及对SCANSAR性能的影响;然后,介绍了一种改进的星载SCANSAR实现方式和系统参数设计方法,该方法通过合理选择系统参数和波束扫描策略可避免波位切换造成脉冲丢失;最后,通过仿真分析本方法对SCANSAR系统性能改善的可行性.“,”The SCANSAR acquired large swath by switching elevation beam,but switching beam caused the echo losses of prior beam and degraded the performance of SCANSAR.This paper analyzed the reason that caused the losses of echo and effect on the performance of SCANSAR.Then,an improved way of accomplishing SCANSAR mode and relevant method of designing system parameters of SCANSAR are introduced in this paper.The method can avoid echo losses by selecting reasonable system parameter and sequence of beam.In the end,simulation analysis of this method is discussed in details,which indicated that the research method is valid.