Design of Integrated Communication and Remote Sensing in LEO Satellite Systems

In this paper, we investigate the integration of communication and synthetic aperture radar (SAR)-based remote sensing in low Earth orbit (LEO) satellite systems. To address the high-mobility characteristic of LEO satellites, we propose an integrated system architecture based on an orthogonal delay-Doppler division multiplexing (ODDM) signal waveform. Specifically, we provide a wireless frame compatible with the 5G NR standard for signal sharing and design a unified channel sensing scheme that utilizes shared ODDM signals for both channel estimation in communication and interference-free range reconstruction in SAR imaging. Finally, numerical simulation results confirm the effectiveness of the proposed scheme.