APOLLO 17 LUNAR SOUNDER DATA PROVIDE INSIGHT INTO AITKEN CRATER’S SUBSURFACE
STRUCTURE. B. L. Cooper1, 1Oceaneering Space Systems, 16665 Space Center Blvd., Houston TX 77058 (bon-
Introduction: In preparation for the forthcoming
avalanche of data from LRO, we conducted a pilot
study to demonstrate integration of multiple geophysi-
cal data sets. We applied methods of data integration
that are used by the commercial mineral exploration
industry to enhance the value of historical data sets
and to provide a roadmap for future efforts.
Background: For studies of the lunar near side and
polar regions, ground-based radar provides informa-
tion about texture and thickness of various geologic
units [1-4]. It is not possible to obtain ground-based
radar data for the far side. However, the Apollo Lunar
Sounder Experiment (ALSE) data, which covers the
orbital track of Apollo 17, can be used to obtain in-
formation about the nature of the subsurface at Aitken
crater and other farside locations. These data provide
a bridge between ground-based observations and new
data such as Lunar Radar Sounder (on Kaguya) Mini-
RF (on LRO) and Mini-SAR (on Chandraayan-1).
The ALSE employed synthetic-aperture radar
(SAR) to detect subsurface features along the ground
track of the command module . The frequencies
used were 5, 15, and 150 MHz, and the low-frequency
signal had a nominal penetration depth of 1300 m.
The lowest-frequency data set, HF-1, was digitized
and analyzed by  and . The results of  for
Aitken crater are shown in Figures 1 and 2.
Figure 1. The crater Aitken (16.8ºS, 173.4ºE) is imaged at
right in all four panels. (a) Radar images from the Apollo 17
Lunar Sounder Experiment (ALSE). (b) Plots of strongest
radar signals, with latitude and longitude correlation marks
and ancillary data.
High-quality global radar data are forthcoming
from LRO  as well as other spacecraft; however, the
shorter wavelengths used on these new instruments are