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针对雷达在斜视工作下的InISAR成像问题进行研究,从理论上推导了斜视对于InISAR成像的影响.一方面,斜视附加相位与待求参量存在耦合,增加了目标方位向和高度向坐标值求解的难度.另一方面,斜视角的存在引起目标纵向坐标的估计误差和三维像的扭曲.传统InISAR成像算法无法有效解决上述两点问题,基于此本文提出了非线性最小二乘和坐标变换联合估计目标散射点坐标的方法,从而得到反映目标真实尺寸的三维像.仿真实验证明了本文提出方法的有效性.
Aiming at the imaging problem of InISAR under strabismus, the influence of strabismus on InISAR imaging is deduced theoretically.On the one hand, the additional stochastic phase is coupled with the unknown parameter, On the other hand, the existence of oblique angle causes the estimation error of the target longitudinal coordinate and the distortion of the three-dimensional image.The traditional InISAR imaging algorithm can not effectively solve the above two problems. Based on this, a joint estimation of nonlinear least squares and coordinate transformation The method to get the coordinates of the target scattering point and get the three-dimensional image reflecting the true size of the target.The simulation results show the effectiveness of the proposed method.