[time-nuts] OT: Far-out space navigation from sideways satnav signals

[Magnus Danielson]

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 current satnav signals could guide missions much
>> further away in space, up to geostationary orbit or even as far as the
>> Moon. " See:
>>
>> http://www.esa.int/Our_Activities/Space_Engineering/Far-out_space_navigation_from_sideways_satnav_signals
>>
>>
> Interesting..
>
> I know there's a bunch of analysis about how to use GPS at the moon. you
> need to look at the GPS satellites on the far side of the earth, grazing
> the limb.

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)?

Cheers,
Magnus