One needs to know the carrier frequency. Must be a high quality reference
for the Cassini transmitter.
On 04/03/2014 08:17 PM, Chris Albertson wrote:
I just read about a discovery of a liquid water ocean on Saturn's moon
Enceladus. The method used was to measure the velocity of a
spacecraft
Hi
Back when they were designing this stuff, they were very interested in getting
into the parts in 10 to the 15th. They didn’t get there, but that was the
desire.
Bob
On Apr 4, 2014, at 2:17 AM, Chuck Forsberg WA7KGX c...@omen.com wrote:
One needs to know the carrier frequency. Must be a
On 4/3/14 8:17 PM, Chris Albertson wrote:
I just read about a discovery of a liquid water ocean on Saturn's moon
Enceladus. The method used was to measure the velocity of a
spacecraft as it makes a close fly-by. Gravitational anomalies will
cause the spacecraft to speed up or slow down as it
On 4/3/14 11:17 PM, Chuck Forsberg WA7KGX wrote:
One needs to know the carrier frequency. Must be a high quality reference
for the Cassini transmitter.
Two way measurements are most likely here (although Cassini does carry a
USO). So the downlink is locked to the uplink which comes from a
On 4/4/14 4:30 AM, Bob Camp wrote:
Hi
Back when they were designing this stuff, they were very interested in getting
into the parts in 10 to the 15th. They didn’t get there, but that was the
desire.
Roughly that...
http://lasp.colorado.edu/~horanyi/graduate_seminar/RSS.pdf is a good
Jim,
Thanks for sharing the details and preventing this subject from turning
into shared ignorance.
Bill Hawkins
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On 4 Apr 2014 08:55, Tom Knox act...@hotmail.com wrote:
90 microns is approx a freq res of about 1 x 3.66 -12
Thomas Knox
Since the Doppler shift is prortional to the frequency, I can't see how
one can determine the absolute frequency.
But given light travels at 3e8 m/s and they can
On 4/4/14 7:39 AM, Bill Hawkins wrote:
Jim,
Thanks for sharing the details and preventing this subject from turning
into shared ignorance.
It was working on this kind of thing that led me to time-nuts in the
first place..
Deep Space nav is probably one of the most precise measurements made
You are correct. I did most in my head late last night and kind of lost my
focus as I was finishing. I was attempting to see roughly what timing accuracy
was needed. I meant to end the sentence with a question mark.
Thomas Knox
Date: Fri, 4 Apr 2014 13:01:12 +0100
From: drkir...@gmail.com
On 4/4/14 5:01 AM, Dr. David Kirkby wrote:
On 4 Apr 2014 08:55, Tom Knox act...@hotmail.com wrote:
90 microns is approx a freq res of about 1 x 3.66 -12
Thomas Knox
Since the Doppler shift is prortional to the frequency, I can't see how
one can determine the absolute frequency.
But
On Fri, Apr 4, 2014 at 6:19 AM, Jim Lux jim...@earthlink.net wrote:
Radio science and navigation measurements are quite impressive in their
accuracy and attention to detail. measuring range to cm (out of a billion
km, i.e 1 part in 1E14) and velocity to mm/s is sort of standard.
Looks to be
On 4/4/14 9:34 AM, Chris Albertson wrote:
On Fri, Apr 4, 2014 at 6:19 AM, Jim Lux jim...@earthlink.net wrote:
Radio science and navigation measurements are quite impressive in their
accuracy and attention to detail. measuring range to cm (out of a billion
km, i.e 1 part in 1E14) and velocity
gravitation measurement, particularly gravitation measurement in space
is based on the Eotvos -effect see here:
http://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_effect and here:
http://en.wikipedia.org/wiki/Lor%C3%A1nd_E%C3%B6tv%C3%B6sand from
the begin of the space exploration many space
On 4/4/14 9:58 AM, Alex Pummer wrote:
gravitation measurement, particularly gravitation measurement in space
is based on the Eotvos -effect see here:
http://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_effect and here:
http://en.wikipedia.org/wiki/Lor%C3%A1nd_E%C3%B6tv%C3%B6sand from
the begin
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