On 4/27/13 9:40 AM, Gregory Muir wrote:
On Fri, 26 Apr 2013 17:59:21 -0700, Jim Lux wrote:
Total dose will be very small (after all astronauts live in LEO)
So you'd worry about cosmic rays and single event effects.
<snip>
They fly a lot of unmodified commercial equipment on ISS (and on
Shuttle, when we still flew it) and they typically have MTBF of a month
or so for the really soft parts. Most stuff will last a year before it
dies.
<snip>
I'm curious if they ever have any problem with earth-based commercial component
outgassing clouding the camera optics.
I suspect that on ISS, there's no precision imaging. There's so much
crud flying around station I doubt it would be worth trying.
Station is a unique environment. It's enormous (>100 meters), it's mind
bendingly complex (no single person understands it, there's thousands of
people involved). Another problem with doing any sort of precision
imaging is that you probably don't know where your sensor is or where
it's pointed with sufficient precision. In absolute terms, you probably
know where it is within about 100 meters (in Earth referenced
coordinates) and where it's pointed within a few degrees. The structure
moves and flexes a lot. No spy satellite here..
We're doing a precision orbit determination experiment with a software
GPS receiver over the next few months (it is the first civil L1/L2c/L5
GPS receiver in orbit). It's been challenging to find out information
like Center of Mass position, where the other GPS receivers are, etc.
(complicated in part because half of station is measured in inches/feet,
and the other half in meters)
I
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
