Sliding Spotlight Mode Design and Slant Range Model for Elliptical Orbit SAR

Focusing on the characteristics of large eccentricity, time-varying orbit height and satellite speed in elliptical orbit SAR, the sliding mode design was studied for large elliptical orbit SAR. Firstly, considering different resolution improvement factors at different orbital positions, ground beam footprint consistency, antenna scanning angle, antenna scanning angular velocity and so on, a sliding spotlight mode was designed for large elliptical orbit SAR. Then, the slant range model of gliding spotlight mode echo was studied. Finally, a simulation validation was carried out. The simulation results show that the parameters of sliding spotlight mode for elliptical orbit SAR need to be adjusted with the change of orbit position. In order to meet the imaging requirements, the slant model needs to be expanded to third order.