jim...@earthlink.net said:
> Then on the ground, we time tag (with an atomic clock) when the telemetry
> frame is received. (giving you "Earth Received Time" or ERT) Someone on the
> ground does a process of time correlation figuring out what spacecraft time
> corresponds to what TAI time, allow
On 9/21/13 5:41 AM, Bob Camp wrote:
Hi
I'd be a bit surprised if they were running anything as power hungry as an Rb
all the time when a quartz based device would be smaller / lower power / lower
volume. Of course they may have had mission requirements that drive them to a
hydrogen maser ...
Jim,
On 09/21/2013 01:32 PM, Jim Lux wrote:
> On 9/21/13 2:30 AM, Rob Kimberley wrote:
>> David,
>>
>> The satellite has probably got a Rb as its clock (hopefully more than
>> one).
>
> Very, very few deep space probes carry a Rb ( I can't think of any off
> hand). Regular old quartz, usually som
Hi
I'd be a bit surprised if they were running anything as power hungry as an Rb
all the time when a quartz based device would be smaller / lower power / lower
volume. Of course they may have had mission requirements that drive them to a
hydrogen maser ...
Bob
On Sep 21, 2013, at 5:30 AM, Rob
On 9/21/13 2:30 AM, Rob Kimberley wrote:
David,
The satellite has probably got a Rb as its clock (hopefully more than one).
Very, very few deep space probes carry a Rb ( I can't think of any off
hand). Regular old quartz, usually some sort of tcxo. If they are
doing radio science, then it
If I was to make an educated guess about this one I'd say that it is more
likely to be an overflow problem. The spacecraft was operating for
significantly longer than it's builders or programmers ever considered
likely.
-Geoff.
On Sat, 21 Sep 2013 07:30:54 pm Rob Kimberley wrote:
> David,
>
>
David,
The satellite has probably got a Rb as its clock (hopefully more than one).
All I can imagine is that there has been a major clock failure of some sort,
and everything is in free run and unable to sync up with ground.
Thoughts?
Rob
-Original Message-
From: time-nuts-boun...@febo.