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The
second phase of the meteor project is now well advanced. The
first of
three receivers has been deployed to the Norman Lockyer
observatory
and a the second will be deployed to a location near the Armagh
observatory in the next few weeks. We hope to find a suitable
site
for the third receiver in Scotland soon. The first independent
receiver has been built by Dave and is located near Malvern. The
receiver data is being streamed to our server to form a
public facing display. This can be found at
. At present, the data streams from Norman Lockyer, from the
test
site in NW Hampshire, the Malvern receiver and the development
system
in Shropshire are being displayed. We will add the Armagh and
Scottish receivers as soon as they become available. The
Hampshire
and Malvern receivers will see some aircraft and direct signal
from
time to time. Currently only +/-30 Hz is being displayed from
each
receiver. Expect this to be expanded as development continues.
It
would
be great to have more pairs of eyes looking at the echoes as
there is
a lot of interesting stuff to observe. More from :? -?
. ? Here are two screenshots from
this morning.
|
Hi Brian
What is it you are looking for folks to do?
Andy
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Brian via groups.io
Sent: 28 November 2023 10:47
To: [email protected]
Subject: [baa-rag] Meteor Project update
?
The second phase of the meteor project is now well advanced. The first of three receivers has been deployed to the Norman Lockyer observatory and a the second will be deployed to a location near
the Armagh observatory in the next few weeks. We hope to find a suitable site for the third receiver in Scotland soon. The first independent receiver has been built by Dave and is located near Malvern. The receiver data is being streamed to our server to form
a public facing display. This can be found at . At present, the data streams from Norman Lockyer, from the test site in NW Hampshire, the Malvern receiver and the development system in Shropshire are being displayed. We will add the Armagh and Scottish receivers as soon
as they become available. The Hampshire and Malvern receivers will see some aircraft and direct signal from time to time. Currently only +/-30 Hz is being displayed from each receiver. Expect this to be expanded as development continues.
It would be great to have more pairs of eyes looking at the echoes as there is a lot of interesting stuff to observe. More from :? -?
. ? Here are two screenshots from this morning.
|
Thanks for the update Brian
Best wishes
Mike
On 28/11/2023 10:47, Brian wrote:
toggle quoted message
Show quoted text
The
second phase of the meteor project is now well advanced. The
first of three receivers has been deployed to the Norman
Lockyer observatory and a the second will be deployed to a
location near the Armagh observatory in the next few weeks. We
hope to find a suitable site for the third receiver in
Scotland soon. The first independent receiver has been built
by Dave and is located near Malvern. The receiver data is
being streamed to our server to form a public facing display.
This can be found at
. At present, the data streams from Norman Lockyer, from the
test site in NW Hampshire, the Malvern receiver and the
development system in Shropshire are being displayed. We will
add the Armagh and Scottish receivers as soon as they become
available. The Hampshire and Malvern receivers will see some
aircraft and direct signal from time to time. Currently only
+/-30 Hz is being displayed from each receiver. Expect this to
be expanded as development continues.
It
would be great to have more pairs of eyes looking at the
echoes as there is a lot of interesting stuff to observe. More
from :? -? .
? Here are two screenshots from this morning.
|
Hello Andy
In the first instance just take a look and start to think about
the information we might gather. The first thing I find
interesting is that echoes seen by one receiver are often unseen
by others. This speaks of the directionality of the reflections.
Note also that sometimes very different Doppler shifts are
observed for the same event viewed from even similar directions.
The bearings from the beacon to? NLO and Hampshire are not very
different. Maybe the event occurred between NLO and Hampshire ??
Other basics to look for include extent of Doppler on head echoes
( we are not yet displaying this as clearly as we wish) brightness
and duration of head echoes. (Again we hope to be able to provide
better resolution as development continues.) Duration brightness
and spectral spread of Tail echoes. Thoughts on the strange
epsilon echoes we see.? We are at the start of this adventure.
Brian
On 28/11/2023 11:22, Andrew Thornett
via groups.io wrote:
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Show quoted text
Hi
Brian
What
is it you are looking for folks to do?
Andy
?
?
The second
phase of the meteor project is now well advanced. The first
of three receivers has been deployed to the Norman Lockyer
observatory and a the second will be deployed to a location
near the Armagh observatory in the next few weeks. We hope
to find a suitable site for the third receiver in Scotland
soon. The first independent receiver has been built by Dave
and is located near Malvern. The receiver data is being
streamed to our server to form a public facing display. This
can be found at . At present, the data
streams from Norman Lockyer, from the test site in NW
Hampshire, the Malvern receiver and the development system
in Shropshire are being displayed. We will add the Armagh
and Scottish receivers as soon as they become available. The
Hampshire and Malvern receivers will see some aircraft and
direct signal from time to time. Currently only +/-30 Hz is
being displayed from each receiver. Expect this to be
expanded as development continues.
It would be
great to have more pairs of eyes looking at the echoes as
there is a lot of interesting stuff to observe. More from :?
-?
.
? Here are two screenshots from this morning.
|
Hi Brian
It's great to have the receivers displayed together like this. A few minutes watching from Goa in India, showed no correlation as indeed we have largely found. We do need to see how we can extract science from these random streams. I'm not sure if Sir Bernard cracked that one. I've been reading a book about radar called 'The Invention the Changed the World' - the story of radar from war to peace. It says that the Missile Early Warning systems studied meteor trails in great detail to characterise them from missiles. So some of that research might be worth pursuing.
Tony?
On Tue, 28 Nov 2023, 16:17 Brian, < brian@...> wrote:
The
second phase of the meteor project is now well advanced. The
first of
three receivers has been deployed to the Norman Lockyer
observatory
and a the second will be deployed to a location near the Armagh
observatory in the next few weeks. We hope to find a suitable
site
for the third receiver in Scotland soon. The first independent
receiver has been built by Dave and is located near Malvern. The
receiver data is being streamed to our server to form a
public facing display. This can be found at
. At present, the data streams from Norman Lockyer, from the
test
site in NW Hampshire, the Malvern receiver and the development
system
in Shropshire are being displayed. We will add the Armagh and
Scottish receivers as soon as they become available. The
Hampshire
and Malvern receivers will see some aircraft and direct signal
from
time to time. Currently only +/-30 Hz is being displayed from
each
receiver. Expect this to be expanded as development continues.
It
would
be great to have more pairs of eyes looking at the echoes as
there is
a lot of interesting stuff to observe. More from :? -?
. ? Here are two screenshots from
this morning.
|
The reason why some stations see a meteor and other don’t can be found in WGN, the Journal of the IMO 51:4 (2023) pp72-92. ? ? ? ? Regards ? Mike --- ? ???? ?/\ ??_/\/? \ ?/??????? \/\ ? Mike German Hayfield in High Peak ?
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Thank you Mike. I hope you will find the GB3MBA beacon and the
data streams from the receiver network, when fully operational, of
use to your studies especially of meteor events over the UK.
Brian
On 28/11/2023 16:17, Mike German via
groups.io wrote:
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Show quoted text
The reason why some stations see a meteor
and other don’t can be found in WGN, the Journal of the IMO
51:4 (2023) pp72-92.
?
?
?
?
Regards
?
Mike
---
?
????
?/\
??_/\/?
\
?/???????
\/\
?
Mike
German
Hayfield
in High Peak
?
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I think the biggest problem we both have is sorting the wheat from the chaff.? AIrcraft on the beacon and local interference for me :-(
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Hello Mike
The plan is to install the 3 principle receivers at least 300km
from the beacon which greatly reduces aircraft reflections. The
next installation is scheduled for a site close to the Armagh
observatory and I hope that will see fewer aircraft. My
installation is only for system testing and is too close to the
beacon.
Brian
On 28/11/2023 16:59, Mike German via
groups.io wrote:
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Show quoted text
I think the biggest problem we both have is sorting the wheat from
the chaff.? AIrcraft on the beacon and local interference for me
:-(
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Just realised you need to be a member of IMO to see that paper. ?If anyone is interested send me an email for a copy
|
Yes please Mike
Many thanks
Mike
On 29/11/2023 09:01, Mike German via
groups.io wrote:
toggle quoted message
Show quoted text
Just realised you need to be a member of IMO to see that paper.
?If anyone is interested send me an email for a copy
|
Hello Mike
Dave's receiver system is using an indoor HB9CV type antenna in
his apartment loft space. This is an elevated location with a good
path towards the beacon hence the strong direct signal. This is
not ideal but it is great that Dave has put together a receiver on
his own account, not a part of the main project. We hope that
there will be more "independent" receivers in the future. We will
be publishing the receiver design and software will be open source
when all is stable. Processing the data at the server to produce
the displays we currently have is consuming a lot of processing
power and we have had to limit the displayed bandwidth to +/-30Hz
for now. We are working on ways to deal with this problem and
there will be changes at some point in the future to improve the
display scope and resolution. I think we will, in the end have to
limit the number of receivers we can display on the web page and
pick the best.? The raw data from at least some, the best,? of the
receivers will be available for you and any other "serious"
observers to access and process using your own software of choice
and, we hope, develop things such as the "event trigger", rolling
buffer to store maybe 10 seconds of data around "significant"
events for later analysis and correlation using the embedded
timing data... and more. Such developments may form phase 3 of the
project which we are beginning to think about.? I am hopeful that
we will be able to get support for this once Phase 2 is up and
running as we would wish.
Brian
On 02/12/2023 17:58, Mike German via
groups.io wrote:
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Show quoted text
I've been viewing the streams on and off for a few hours now.?
Would I be correct to assume that Dave's station nr Malvern is
receiving the direct signal from Sherwood?
If a directional antenna is being used it may be possible to
direct it away? so that it is puts the direct signal in a antenna
null perhaps.
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Hi Mike
I am even closer than Dave - Leicester, and get a strong direct signal. I have done a lot of experiments with a vertically pointing Moxon and secondary dipole antenna with phase shifter to null out the direct signal. The settings are quite critical and changes of propagation plus antenna movement cause the direct signal to reappear. It does work, but another down side is that it will also null out certain meteor echoes, so isn't entirely satisfactory. I have also got reasonable results with a 4 element yagi pointing almost vertically, with the elements aligned towards the beacon to null out the direct signal. However, a long distance from the transmitter is the best answer.
Tony
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Tony
In my now dim distance professional life I built a microwave anechoic chamber and used a phase shifter to balance out background reflections and I do know how sensitive the nulls are even under lab conditions. ?Have you tried Yagi point vertically as in the paper I mentioned? ?With the elements pointing directly at the TX I wouldn’t have thought you would have got much direct signal. ?And after all, the meteors are up above so vertical isn’t such an unreasonable option. ?Again see the paper for results and discuss if you like.
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Re elements pointing at TX that’s the element ends of course
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Hi Mike I posted this image last year on the beacon discussion group. This was with a Moxon pointing up, and a 4 element pointing at the beacon - the two being fed into the cancellation system. Switching between the correctly adjusted cancellation and 180 degree phase difference every 30 seconds gave almost perfect cancellation and little difference to the aircraft trails, although no meteor pings visible at the time. I have also tried just aligning the elements as you suggest - I'm not sure if I have an image of that. In any case, there are too many aircraft reflections from here, so I found it impossible to get Spectrum lab to report meteors.  Tony
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I just saw my first correlation between Brians rx and Norman Lockyer. However, it is always noticeable?that Brian's rx is lower?noise and higher gain than the others.
Tony
Hi Brian
It's great to have the receivers displayed together like this. A few minutes watching from Goa in India, showed no correlation as indeed we have largely found. We do need to see how we can extract science from these random streams. I'm not sure if Sir Bernard cracked that one. I've been reading a book about radar called 'The Invention the Changed the World' - the story of radar from war to peace. It says that the Missile Early Warning systems studied meteor trails in great detail to characterise them from missiles. So some of that research might be worth pursuing.
Tony?
On Tue, 28 Nov 2023, 16:17 Brian, < brian@...> wrote:
The
second phase of the meteor project is now well advanced. The
first of
three receivers has been deployed to the Norman Lockyer
observatory
and a the second will be deployed to a location near the Armagh
observatory in the next few weeks. We hope to find a suitable
site
for the third receiver in Scotland soon. The first independent
receiver has been built by Dave and is located near Malvern. The
receiver data is being streamed to our server to form a
public facing display. This can be found at
. At present, the data streams from Norman Lockyer, from the
test
site in NW Hampshire, the Malvern receiver and the development
system
in Shropshire are being displayed. We will add the Armagh and
Scottish receivers as soon as they become available. The
Hampshire
and Malvern receivers will see some aircraft and direct signal
from
time to time. Currently only +/-30 Hz is being displayed from
each
receiver. Expect this to be expanded as development continues.
It
would
be great to have more pairs of eyes looking at the echoes as
there is
a lot of interesting stuff to observe. More from :? -?
. ? Here are two screenshots from
this morning.
|
Hello Tony
While talking to Heather ( project software lead) I captured
these two screenshots.
 
On 07/12/2023 10:12, Tony Abbey wrote:
toggle quoted message
Show quoted text
I just saw my
first correlation between Brians rx and Norman Lockyer.
However, it is always noticeable?that Brian's rx is
lower?noise and higher gain than the others.
Tony
Hi Brian
It's great to have the receivers displayed
together like this. A few minutes watching from Goa in
India, showed no correlation as indeed we have largely
found. We do need to see how we can extract science from
these random streams. I'm not sure if Sir Bernard cracked
that one. I've been reading a book about radar called 'The
Invention the Changed the World' - the story of radar from
war to peace. It says that the Missile Early Warning
systems studied meteor trails in great detail to
characterise them from missiles. So some of that research
might be worth pursuing.
Tony?
On Tue, 28 Nov 2023, 16:17
Brian, < brian@...>
wrote:
The
second phase of the meteor project is now well
advanced. The first of three receivers has been
deployed to the Norman Lockyer observatory and a the
second will be deployed to a location near the
Armagh observatory in the next few weeks. We hope to
find a suitable site for the third receiver in
Scotland soon. The first independent receiver has
been built by Dave and is located near Malvern. The
receiver data is being streamed to our server to
form a public facing display. This can be found at
. At present, the data streams from Norman Lockyer,
from the test site in NW Hampshire, the Malvern
receiver and the development system in Shropshire
are being displayed. We will add the Armagh and
Scottish receivers as soon as they become available.
The Hampshire and Malvern receivers will see some
aircraft and direct signal from time to time.
Currently only +/-30 Hz is being displayed from each
receiver. Expect this to be expanded as development
continues.
It would
be great to have more pairs of eyes looking at the
echoes as there is a lot of interesting stuff to
observe. More from :? -? .
? Here are two screenshots from this morning.
|
Excellent correlations. I can see I'll have to watch for longer.
Tony
On Thu, 7 Dec 2023 at 11:09, Brian < brian@...> wrote:
Hello Tony
While talking to Heather ( project software lead) I captured
these two screenshots.
 
On 07/12/2023 10:12, Tony Abbey wrote:
I just saw my
first correlation between Brians rx and Norman Lockyer.
However, it is always noticeable?that Brian's rx is
lower?noise and higher gain than the others.
Tony
Hi Brian
It's great to have the receivers displayed
together like this. A few minutes watching from Goa in
India, showed no correlation as indeed we have largely
found. We do need to see how we can extract science from
these random streams. I'm not sure if Sir Bernard cracked
that one. I've been reading a book about radar called 'The
Invention the Changed the World' - the story of radar from
war to peace. It says that the Missile Early Warning
systems studied meteor trails in great detail to
characterise them from missiles. So some of that research
might be worth pursuing.
Tony?
On Tue, 28 Nov 2023, 16:17
Brian, < brian@...>
wrote:
The
second phase of the meteor project is now well
advanced. The first of three receivers has been
deployed to the Norman Lockyer observatory and a the
second will be deployed to a location near the
Armagh observatory in the next few weeks. We hope to
find a suitable site for the third receiver in
Scotland soon. The first independent receiver has
been built by Dave and is located near Malvern. The
receiver data is being streamed to our server to
form a public facing display. This can be found at
. At present, the data streams from Norman Lockyer,
from the test site in NW Hampshire, the Malvern
receiver and the development system in Shropshire
are being displayed. We will add the Armagh and
Scottish receivers as soon as they become available.
The Hampshire and Malvern receivers will see some
aircraft and direct signal from time to time.
Currently only +/-30 Hz is being displayed from each
receiver. Expect this to be expanded as development
continues.
It would
be great to have more pairs of eyes looking at the
echoes as there is a lot of interesting stuff to
observe. More from :? -? .
? Here are two screenshots from this morning.
|
