Simulation of SAR Interferometric Images Based on Lunar Topography

Abstract

In order to understand the SAR imaging characteristics of the lunar surface and assist in the design of SAR imaging observation systems around the moon using existing data，a simulation scheme for lunar surface SAR images based on lunar topographic data is proposed. In this scheme，given the circumlunar trajectory and baseline parameters，the corresponding off-nadir angles are calculated based on the existing lunar Digital Elevation Model (DEM) data and the set SAR imaging parameters. The local incidence angles for each point on the lunar surface are then calculated，and the simulation is performed based on the RD model and interferometric height measurement principle，using the set backscattering coefficients. This process generates simulated SAR amplitude images and interferometric phases. The effectiveness of the simulation scheme was verified by simulating lunar surface SAR images under different baseline conditions using the LOLA DEM with a grid spacing of 118m.

Keywords

Synthetic Aperture Radar (SAR) / SAR interferometric image simulation / lunar / digital elevation model