Calibration Method and Implementation for the Lunar Penetrating Radar on Chang'e-7 Mission

The Chang'e-7 mission carries a Lunar Penetrating Radar (LPR) for investigating shallow subsurface structures. To ensure data validity and enhance measurement accuracy, we developed a space-qualified calibration protocol for the penetrating radar system. Successful calibration tests confirmed all performance metrics meet scientific requirements. The acquired transfer function and time-varying gain (TVG) curves establish a robust calibration baseline for lunar data processing. This methodology provides a technical framework for future deep-space radar missions.