1994-04-26 - Re: CU Crypto Session Sat
Header Data
From: dat@@.spock.ebt.com (David Taffs)
To: freeman@netcom.com
Message Hash: d70c54989e2e208a5dfbdb6dba9ab74c0ef4eead7e1a6a27dc5c2d06cbfe43d2
Message ID: <9404262122.AA01185@helpmann.ebt.com>
Reply To: <199404261538.IAA10897@netcom.com>
UTC Datetime: 1994-04-26 21:24:07 UTC
Raw Date: Tue, 26 Apr 94 14:24:07 PDT
Raw message
From: dat@@.spock.ebt.com (David Taffs)
Date: Tue, 26 Apr 94 14:24:07 PDT
To: freeman@netcom.com
Subject: Re: CU Crypto Session Sat
In-Reply-To: <199404261538.IAA10897@netcom.com>
Message-ID: <9404262122.AA01185@helpmann.ebt.com>
MIME-Version: 1.0
Content-Type: text/plain
Phil Karn comments on spy-satellite resolution:
> [Technical argument with which I agree, leading to approximate one-foot
> resolution limit, deleted.]
... goes away fast at higher angular frequencies. So all in all, I am inclined
to think that the best ground resolution attainable with a 2-meter aperture
from orbit is about an inch. That is in fact just about enough to read a ...
Of course, a possible way around this limit is to put up a larger,
segmented mirror...
-- Jay Freeman
Could the same effect (as a segmented mirror) be achieved by taking multiple
pictures (from the same mirror) and processing them together? E.g. does
synthetic aperture radar actually produce higher resolution than achievable
from a single "snapshot"? If so, then this might work (at least for slow-moving
targets :-)...
Enchoiring Mimes Want to Know!
--
dat@ebt.com (David Taffs)
Thread
Return to April 1994
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Return to “tcmay@netcom.com (Timothy C. May)”
- 1994-04-26 (Tue, 26 Apr 94 08:37:09 PDT) - Re: CU Crypto Session Sat - freeman@netcom.com (Jay Reynolds Freeman)
- 1994-04-26 (Tue, 26 Apr 94 14:24:07 PDT) - Re: CU Crypto Session Sat - dat@@.spock.ebt.com (David Taffs)
- 1994-04-26 (Tue, 26 Apr 94 15:12:19 PDT) - Synthetic Apertures to Increase Resolution - tcmay@netcom.com (Timothy C. May)
- 1994-04-26 (Tue, 26 Apr 94 16:42:21 PDT) - Re: Synthetic Apertures to Increase Resolution - dat@@.spock.ebt.com (David Taffs)
- 1994-04-26 (Tue, 26 Apr 94 15:32:15 PDT) - Re: CU Crypto Session Sat - “Mark W. Eichin” <eichin@paycheck.cygnus.com>
- 1994-04-27 (Tue, 26 Apr 94 22:43:14 PDT) - Re: CU Crypto Session Sat - Phil Karn <karn@qualcomm.com>
- 1994-04-28 (Thu, 28 Apr 94 06:34:12 PDT) - Re:Spy Satellite Resolution - Mats Bergstrom <matsb@sos.sll.se>
- 1994-04-28 (Thu, 28 Apr 94 08:08:49 PDT) - Re: Spy Satellite Resolution - “Brendan McKenna” <brendan@oc3s-emh1.army.mil>
- 1994-04-26 (Tue, 26 Apr 94 15:12:19 PDT) - Synthetic Apertures to Increase Resolution - tcmay@netcom.com (Timothy C. May)
- 1994-04-26 (Tue, 26 Apr 94 14:24:07 PDT) - Re: CU Crypto Session Sat - dat@@.spock.ebt.com (David Taffs)