Ultra wideband penetrating imaging radar and its application in China's lunar exploration project
The subsurface structure of the Moon has recorded key information about the Moon's formation and evolution,therefore,precise exploration of the subsurface structure of the Moon is an important scientific goal of China's lunar exploration project.Ultra-wideband(UWB)penetrating imaging radar is the most effective technology for acquiring the subsurface structure of the Moon.China's lunar probes,Chang'e-3 and Chang'e-4,have been pioneers in employing UWB penetrating imaging radar for the exploration of extraterrestrial bodies,achieving significant advancements.This paper conducts a comparative analysis and selection of signal used by UWB penetrating imaging radar,summarizes the features of the penetrating imaging radar systems used in the Lunar exploration project and their key technological breakthroughs,and provides an analysis and summary of the subsurface detection results of the Moon.It provides valuable references for the instrument design and scientific research of subsequent missions.