时间误差分析的双基地运动目标聚焦成像方法

Bistatic Moving Target Focused Imaging Method Based on Time Error Analysis

在推导目标回波相位历程的基础上,分析了双基地系统中的收、发时间误差对距离向和方位向处理造成的影响,并构造了相应的补偿因子,同时给出了基于相位中心偏置天线的星机双基地杂波对消约束条件。针对运动目标的距离徙动使用二阶Keystone变换和Radon变换对其进行校正,为了构造精确的方位压缩匹配滤波器利用修正离散调频傅里叶变换进行多普勒参数估计。最后计算机仿真验证了所提方法的有效性。

Based on the analysis of echo phase, the impact of time error on range and azimuth is ana- lyzed and the corresponding compensation factors are also given. Meanwhile, the DPCA clutter cancella- tion constraints for spaceborne-airborne bistatic system are derived. General two-order Keystone transform and Radon transform are applied to eliminate range migration. In order to construct azimuth matched fil- ter, the modified discrete chirp-Fourier transform is employed to Doppler parameters estimation. Finally, the computer simulation results validate its effectiveness.