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range errors on Progress approach screens.



 
 
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  #1  
Old May 13th 09, 08:16 AM posted to sci.space.station
Brian Gaff
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Default range errors on Progress approach screens.

Listening to the docking yesterday, I heard several times that the range
given was incorrect, though the data itself being used for the auto approach
was right. Sounds like a software problem to me.

Brian

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  #2  
Old May 13th 09, 05:51 PM posted to sci.space.station
Who Needs Fenders?[_2_]
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Default range errors on Progress approach screens.

Brian Gaff wrote:
Listening to the docking yesterday, I heard several times that the range
given was incorrect, though the data itself being used for the auto approach
was right. Sounds like a software problem to me.


I was watching the video feed--the range clearly jumped up unexpectedly.

IIRC, it coincided with retraction of an antenna. I also recall that
the target cross-hairs didn't look to be aimed at the docking port, but
a bit "low"--not sure if that caused the range-finder to pickup on a
more "recessed" portion of the station...

Then again, I think at time of capture, the range still showed about 10m...

They didn't sound too concerned about it, and from what it sounds, they
didn't have to take manual control it.
  #3  
Old May 14th 09, 08:35 AM posted to sci.space.station
Brian Gaff
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Posts: 2,312
Default range errors on Progress approach screens.

Yes, that is right. Sounds like the range given on screen was from a
different source then.

I think from previous interviews I have heard the cross hairs thing is quite
normal, and is well within the the acceptable limits of the capture system.
When you are handling large masses, hyou most certainly do not want to give
it a big push when close in and screw it up completely!

Brian

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"Who Needs Fenders?" wrote in message
...
Brian Gaff wrote:
Listening to the docking yesterday, I heard several times that the range
given was incorrect, though the data itself being used for the auto
approach was right. Sounds like a software problem to me.


I was watching the video feed--the range clearly jumped up unexpectedly.

IIRC, it coincided with retraction of an antenna. I also recall that the
target cross-hairs didn't look to be aimed at the docking port, but a bit
"low"--not sure if that caused the range-finder to pickup on a more
"recessed" portion of the station...

Then again, I think at time of capture, the range still showed about
10m...

They didn't sound too concerned about it, and from what it sounds, they
didn't have to take manual control it.



 




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