Dan,
This is HF, but similar concept of a low cost receiver, with integrated GPS,
tacked onto a single board computer.
https://www.kickstarter.com/projects/1575992013/kiwisdr-beaglebone-software-defined-radio-sdr-with
Lou
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We are trying to use simple time of arrival so
using a 1PPS sync of a GPS should bee good enough.
For this Mega Burst detector, much can be learned with out the need for
VLBI type of resolution.
This is sort of like the LIGO gravity wave detector
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They (likely) have hardware designed specifically for their task that is
higher cost and quality.
On Fri, Apr 1, 2016 at 10:35 AM, wrote:
> The main thing is that these bursts are *weak* (< 1Jy typically), and
> *short duration*. Detecting a CW weak source with smaller antennae is
> feasible, b
The main thing is that these bursts are *weak* (< 1Jy typically), and
*short duration*. Detecting a CW weak source with smaller antennae is
feasible, because you can use long integration times. You have no such
option here, unless you're talking about hundreds or thousands of
dipoles, all phase
There are 3 options that I can think of:
1) Use multiple SDRs at each location.
2) Run an optimization algorithm as a post processing step to figure out
what the phase synchronization should be.
3) If there is a transmitting satellite near there in frequency, use that
to determine what the phase
VLBI guys usually have a local H1 maser clock, they go through a complex
synchronization ritual prior to the start of observations. H1 masers
have short-term stability on the order of 1e-16.
GPS synchronization would be a *starting point* for such things.
On 2016-04-01 08:42, madengr wrote:
What would it take to get phase coherency, say at 1 GHz, on a global scale;
short of running cables? I assume with a moderate priced GPSDO one can get
10E-12 stability, so that would be 0.01 Hz frequency stability at 1 GHz.
Does that mean you can integrate for 10 seconds and stay within 0.1 radia
On 03/31/2016 11:10 PM, Dan wrote:
Hello Radio Heads,
Back in 2001 a burst at 1.4 Ghz from the sky was detected and is known as the
Lorimer burst.
Since then, other groups have detected FRB…Fast Radio Bursts that are very
strong, appear to be extragalactic, and short…milliseconds in duration.
On 03/31/2016 11:10 PM, Dan wrote:
Hello Radio Heads,
Back in 2001 a burst at 1.4 Ghz from the sky was detected and is known as the
Lorimer burst.
Since then, other groups have detected FRB…Fast Radio Bursts that are very
strong, appear to be extragalactic, and short…milliseconds in duration.
Hello Radio Heads,
Back in 2001 a burst at 1.4 Ghz from the sky was detected and is known as the
Lorimer burst.
Since then, other groups have detected FRB…Fast Radio Bursts that are very
strong, appear to be extragalactic, and short…milliseconds in duration.
The current theories included young
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