A couple of suggestions from the discussion about finding
Radar satellite come in two varieties. Downward looking and
sideways looking. Sideways looking radars use the motion of
the spacecraft to synthasize (sp) a very large antenna in one
direction. A lunar version of the Earth resources satellites with
a long slab antenna might be a way to get the resolution required.
Incidently knowing where the satellite is essential to reconstruction
of the radar data, so the satellite could also act as a gravity probe.
However sideways looking radars use back scatter from the surface and
are not that good at deep penetration surveys, however such a survey
might reveal the surface signatures (slumping) that indicate a lava
A first crack at that problem might be to examine existing photographs
of the Moon close to the terminator and look for shadow lines.
For deep penetration of the Moon you want as much power as possible going
down, so a dish pointed at the surface would be required, synthesis is
not going to get you sensitivity, but some smart electronics. (spread
band, encoded waveforms) will help. Once again it will be essential to
know where the spacecraft is for reconstruction.
As for geophones. You do not need explosives. Do what was done during
the Apollo missions. Bombard the Moon with space junk. If your mission
is not a direct landing on the Moon, but involves a lunar orbit bus,
then once the geophones are in place. Deorbit the Bus, it should make
a very nice bang when it lands. And if more data is required simply
send something heavy to crash on the Moon. This will allow you to
taylor the mission to your budget.
"Look we have a couple of million bucks left in the account, and
the end of the financial year is coming......"
Geological Survey of Canada * BEWARE!
Ottawa, Ontario, Canada *
Internet: steph...@ngis.geod.emr.ca *Bill Gates is lurking you!