Heliocentric TDRS?

In article 9oPKh.27419$zU1.6632@pd7urf1no,
Dave Michelson wrote:
One way of detecting weak signals (while giving up the ability to decode
symbols) is to integrate and dump over an interval much longer than a
symbol. In this manner, a weak signal will be detectable, but not decodable.

A notable recent example of this was Earth radio telescopes listening to
the channel A signal from Huygens's little transmitter. They heard it,
and they got good solid Doppler measurements on it -- which is good, since
Cassini didn't -- but it was, alas, much too faint to decode any data.
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