Effects of J₂ perturbation on height measurement precision of distributed SAR system

To better analyze and design the distributed SAR system, a precise height measurement model was established considering the eccentricity of the earth, and the imaging precision was analyzed. Meanwhile, considering the on-orbit distributed SAR system affected by different kinds of perturbation, a distributed SAR system with a pendulum formation was taken as an example to research the height imaging capability of the on-orbit system, and the mathematic simulation was conducted under the J₂ perturbation. The results show that, under the J₂ perturbation, the height imaging precision of the distributed SAR system is increasing. According the effects of the J₂ perturbation, a method is presented to guarantee the operation of the distributed SAR system by improving the precision of the baseline, baseline azimuth angle and interventional angle.