Extended Integration Time



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Extended Integration Time
It may be feasible to extend the effective coherent
integration time by using phase-referencing of the ground
telescopes, in order to calibrate out the effects of the
atmosphere. If the ARISE orbit error is 10 cm, and it
de-correlates over a 13-hr orbit, the effective acceleration
error of cm sec
would accumulate to
(0.3 radians) in
sec. Ground-telescope
phase-referencing with an on-source duty cycle of only 30% would
then increase
to 800 sec, and the
fringe-detection threshold might be reduced by a factor of
. However, this would
require changing sources on a time scale of a few seconds, which
will be very difficult (or impossible) for the ground
telescopes.
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