Re: MSNBC - How a 'safe haven' could help save Hubble

From: Bill the Cat (bill_at_the.cat)
Date: 12/10/04 

Date: Thu, 09 Dec 2004 20:16:56 -0600

Louis Scheffer <lou@cadence.com> wrote in
news:41b7f627$1@news.cadence.com:

> Bill the Cat <bill@the.cat> writes:
>
>>And *any* video-based system is going to require image-recognition
>>software that is several orders of magnitude more complex than a
>>lidar-based system requires. That, not the hardware, is going to be
>>the main cost driver in such systems - and it's also a big source of
>>technical risk.
>
> This is not clear to me. Assuming you are docking with a cooperative
> spacecraft, equipping it with a relatively large high contrast target
> should make a video system pretty easy. GPS should get you close
> enough so that the target is resolved, the dockee can make sure the
> target is illuminated. Then if the target is designed with video in
> mind it should be simple to get range, range rate, and orientation
> from a sequence of frames.

It's all relative. No matter how simple you make it, image-recognition
software is still going to be orders of magnitude more complex that what is
needed to process lidar measurements.

> If the spacecraft is not designed with this in mind, or not
> cooperative, then I agree that video could be difficult to design and
> test.

For HST, that is most definitely the case.

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