  Chang'e-3(CE-3) has been the first spacecraft to soft-land on the Moon since
the Soviet Union's Luna 24 in 1976. The spacecraft arrived at Mare Imbrium on
December 14, 2013 and the same day, Yutu lunar rover separated from lander to
start its exploration of the surface and the subsurface around the landing
site. The rover was equipped, among other instruments, with two Lunar
Penetrating Radar systems (LPR) having a working frequency of 60 and 500 MHz.
The radars acquired data for about two weeks while the rover was slowly moving
along a path of about 114 m. At Navigation point N0209 the rover got stacked
into the lunar soil and after that only data at fixed position could be
collected. The low frequency radar data have been analyzed by different authors
and published in two different papers, which reported totally controversial
interpretations of the radar cross sections. The present study is devoted to
resolve such controversy carefully analyzing and comparing the data collected
on the Moon by Yutu rover and on Earth by a prototype of LRP mounted onboard a
model of the CE-3 lunar rover. Such analysis demonstrates that the deep radar
features previously ascribed to the lunar shallow stratigraphy are not real
reflectors, rather they are signal artefacts probably generated by the system
and its electromagnetic interaction with the metallic rover.
