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给出一种天基双基地合成孔径雷达(BSAR)的概念,其拓扑结构为卫星机会发射机、固定接收机和运动目标。推导出运动学矢量方程并描述了采用巴克相位编码调制(BPCM)的BSAR信号数学模型。经证实,BSAR信号形成与图像重构可被分别理解直接投影运算和横向投影运算。通过对投影算子基本图像重构过程进行泰勒扩展,包括相位校正,定义了傅里叶变换距离压缩和傅里叶变换方位压缩。通过数值实验验证了导出的数学模型。
A concept of BSAR is given. Its topological structure is satellite opportunity transmitter, fixed receiver and moving target. Kinematic vector equations are deduced and a mathematical model of BSAR signal using Barker Phase Code Modulation (BPCM) is described. It has been confirmed that BSAR signal formation and image reconstruction can be understood separately from direct projection operation and lateral projection operation. The Taylor expansion of the projection operator basic image reconstruction process, including phase correction, defines the Fourier transform distance compression and Fourier transform azimuth compression. The numerical model is verified by numerical experiments.