On 4/19/13 11:47 AM, Peter Monta wrote:
Hi Hal,
Why are X-Ray pulsars better than radio pulsars for navigation?
My impression is that it's easier to manage all-sky coverage at x-ray with
a small spacecraft package (I think millisecond pulsars generally emit at
both microwave and x-ray).
Hi Hal,
> Why are X-Ray pulsars better than radio pulsars for navigation?
>
My impression is that it's easier to manage all-sky coverage at x-ray with
a small spacecraft package (I think millisecond pulsars generally emit at
both microwave and x-ray). Also there's some interstellar scintillat
On Thu, 18 Apr 2013 13:38:50 -0700
Hal Murray wrote:
> What's the adev of pulsars at long times? How long is long? Where is the
> knee of the curve?
I remember reading something about 10^-18 long term (iirc 1year), but
cannot find where i read it.
But to acheive that level you have to compen
On 4/18/13 12:15 PM, Peter Monta wrote:
I wonder if there's any advantage in combining far-away GPS with X-ray
pulsar navigation (XNAV), which is said to be good to a few kilometers,
though long integration times are needed. For example, the rough system
time from XNAV could enable very long (a
On 4/18/13 11:02 AM, Magnus Danielson wrote:
On 04/18/2013 04:01 PM, Jim Lux wrote:
On 4/18/13 4:01 AM, David J Taylor wrote:
An interesting novel use of GPS "stray" signals
"ESA’s retired GIOVE-A navigation mission has become the first civilian
satellite to perform GPS position fixes from
pmo...@gmail.com said:
> I wonder if there's any advantage in combining far-away GPS with X-ray
> pulsar navigation (XNAV), which is said to be good to a few kilometers,
> though long integration times are needed. For example, the rough system
> time from XNAV could enable very long (arbitrarily
Peter,
On 04/18/2013 09:15 PM, Peter Monta wrote:
Hi Magnus,
Would not an antenna with a deep zero focus on the earth center help to
reduce earth-noise (ground temperature noise as well as man-made noise)?
It might, although you'd need a large antenna to generate the angular
resolution neede
Hi Magnus,
> Would not an antenna with a deep zero focus on the earth center help to
reduce earth-noise (ground temperature noise as well as man-made noise)?
It might, although you'd need a large antenna to generate the angular
resolution needed to reject Earth noise while listening to a GPS bird
On 04/18/2013 04:01 PM, Jim Lux wrote:
On 4/18/13 4:01 AM, David J Taylor wrote:
An interesting novel use of GPS "stray" signals
"ESA’s retired GIOVE-A navigation mission has become the first civilian
satellite to perform GPS position fixes from high orbit. Its results
demonstrate that curr
On 4/18/13 4:01 AM, David J Taylor wrote:
An interesting novel use of GPS "stray" signals
"ESA’s retired GIOVE-A navigation mission has become the first civilian
satellite to perform GPS position fixes from high orbit. Its results
demonstrate that current satnav signals could guide missions
An interesting novel use of GPS "stray" signals
"ESA’s retired GIOVE-A navigation mission has become the first civilian
satellite to perform GPS position fixes from high orbit. Its results
demonstrate that current satnav signals could guide missions much further
away in space, up to geost
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