论文部分内容阅读
本文以星载ＳＡＲ卫星平台和地面目标的空间几何关系为基础，给出了星载ＳＡＲ多普勒参数数学模型，分析了卫星运动、平台姿态、地球旋转、目标高度等几何参数误差对测绘带上的多普勒参数、零多普勒偏移、目标位置等星载ＳＡＲ处理参数的影响，说明了采用“偏航调整”方法（ｙａｗｓｔｅｅｒｉｎｇ），可以使天线波束中心位置指向零多普勒方向而降低多普勒中心频率。最后以航天工业总公司论证的Ｃ－ＳＡＲ系统参数进行了仿真实验，计算结果与理论分析相吻合。
Based on the space geometric relationship between spaceborne SAR satellite platform and ground target, this paper presents the mathematical model of spaceborne SAR Doppler parameters, and analyzes the influence of errors of geometric parameters such as satellite motion, platform attitude, Doppler parameters, zero Doppler shift, target position and other parameters of the spaceborne SAR processing, indicating that the use of “yaw adjustment” method (yawsteering), you can make the antenna beam center point to zero Doppler direction While reducing the Doppler center frequency. Finally, the simulation experiment was carried out with the parameters of C-SAR demonstrated by Aerospace Industries Corporation. The calculated results are in good agreement with the theoretical analysis.