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大处理角对超宽带合成孔径雷达(UWB－SAR)方位聚焦性能有很大的影响,这是由于它引起了方位多普勒频率变化的非线性现象.该文首先研究这种非线性现象,并探讨了它与处理角之间的关系,接着从理论上分析了它对方位聚焦性能的影响,最后通过计算机仿真验证了所有结论的正确性.“,”The azimuth focussing performance is affected according to large processing angle in Ultra Wideband Synthetic Aperture Radars (UWB-SAR). The nonlinear change of azimuth Doppler freuqency in this situation is investigated in the paper firstly. Then, the relation between large processing angle and the phenomenon of nonnlinear change is studied. At the same the the conclusion is drawn that the nonlinearity is enhanced with larger processing angle during discussion. In theory, the influence of this nonlinear phenomenon is analyzed in de tail in the following section. In order to testing our conclusions, some experiments are made in the last section. All experimental results which are displayed with some figures to fully support our theoretical analysis.