Spectrograms

Example Spectrograms, if you want to add to the archive please send the spectrogram along with a description to contact@ukmeteorbeacon.org.

Description
This is an example of a small meteor event showing the classic changing Doppler shift
Spectrogram
Description
A fairly common kind of echo with a distinct head echo with rapidly changing Doppler shift
lowed by a tail echo of 5 to 20 seconds exhibiting spectral spread and little Doppler shift
Spectrogram
Description
A distinct Head echo with Doppler shift extending from about +200Hz to -150Hz and very short tail echo.
There is a weak direct signal too
Spectrogram
Description
A head echo showing mainly positive Doppler shift reducing to zero. With a very short tail echo.
Spectrogram
Description
Unusual head echo with decreasing negative Doppler. i.e. the reflection path was increasing
in length followed by a strong tail echo with two peaks of Doppler. Perhaps indicating wind shear.
Spectrogram
Description
Two echoes, that look like tail echoes but with no head, and no Doppler shift these are most likely
the direct signal by some other propagation mechanism and not directly related to a specific meteor event
Spectrogram
Description
A tail echo displayed with expanded frequency range showing spectral spread.
It has a "vestigial" head echo, the straight, slightly sloping start at the bottom of the trace.
Spectrogram
Description
A very small echo with head and short tail followed by another
event with a head echo and long lasting and strong tail echo.
Spectrogram
Description
A tail echo of more than one second with a vestigial head echo.
Spectrogram
Description
A Clear Head echo with a short Tail.
Spectrogram
Description
A very small head echo with a short tail echo.
Spectrogram
Description
Screen shot from SDR Console, observed from Cornwall at a distance of more than 400km from the beacon.
Spectrogram
Description
Screen shot from SDR Console, observed from Cornwall at a distance of more than 400km from the beacon.
Spectrogram
Description
This image includes some approximately one second time marks injected at the input of the receiver. This is proof of concept test for a possible solution to time stamping observations to permit triangulation of events at a later date. There is also a continuous signal which could be aircraft, as it appears to have a slight Doppler Shift or it might be a direct signal by another propagation mode.
Spectrogram
Description
The image shows an aircraft reflection, beating with a direct signal ( or another aircraft reflection ) creating the characteristic low frequency flutter. There is also a small tail echo which appears to be Doppler shifted a few Hz HF indicating wind at that altitude. ( of course the reflection geometry has to be taken into account).
Spectrogram
Description
The image shows an aircraft reflection with the characteristic low frequency "flutter" along with a small echo followed by a larger one with an obvious head echo
Spectrogram
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