[hpsdr] multiple receivers - is it really necessary

[Henry Vredegoor]

Hi All,

A realization of this system concept is currently being build in Europe:

http://www.lofar.org/


Henry.



> -----Original Message-----
> From: hpsdr-bounces at lists.openhpsdr.org 
> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Graham / KE9H
> Sent: zondag 2 augustus 2009 18:33
> To: Mike Hamel
> Cc: hpsdr at openhpsdr.org
> Subject: Re: [hpsdr] multiple receivers - is it really necessary
> 
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Mike:
> 
> There are techniques that do this, see
> 
> http://www.gpstime.com/
> 
> and read the "Timing for VLBI -2009"  presentation by Tom 
> Clark (K3IO),
> and Rick Hambly (W2GPS).
> 
> They are time stamping radio astronomy signals to (sub) nanosecond 
> accuracies
> and can ship recorded signals from western China back to the 
> US, and then
> assemble and post process them into "Very Long Base Line" 
> received signals,
> with an aperture equal to the diameter of the earth. Using 
> GPSDOs as the
> discipline and sync for an accurate time base.
> 
> Just time stamping to several nanosecond accuracy is enough 
> to recover phase
> information for HF signals.
> 


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