研究了天线波束指向抖动对图像质量的影响,分别给出了等效斜视情形下天线波束方位向多频抖动和距离向多频抖动对成像质量影响的理论分析和仿真结果。理论和仿真结果表明,不论是天线方位波束指向抖动,还是距离向波束指向抖动,皆会出现成对回波现象,影响图像质量;当波束指向为多频抖动时,SAR图像会出现多个成对回波。另外,距离向波束指向抖动,会使距离模糊度变差;方位波束指向抖动,会使方位模糊度变差。

In this paper,the effect of antenna boresight pointing instability on SAR image quality is studied.At the same time,the theoretical analysis and simulation results for the effect of antenna azimuth and elevation boresight pointing multi-frequency jittering on image quality in a squint mode are given respectively.The simulation results show that the paired-echo response function,which effects image quality,can be caused by antenna boresight pointing instability.Multi-paired echoes will appear on the SAR image when antenna boresight pointing function contains multi-frequencies.Moreover,the elevation and azimuth boresight pointing instability can make RASR and AASR worse repectively.

TN957.52 TN82