(meteorobs) [radiometeoren] Re: Question about airplane and automatic counting Spectrum Lab

Thu Sep 19 08:42:03 EDT 2013

Hello,

Thank you for everyone for the support. Sorry, for not being able to answer
earlier. I have been using Maarten Vanleenhove script since few days ago
and it is working very great.

Best wishes,

Raydel

2013/9/14 Jay Salsburg <jsalsburg at bellsouth.net>

> Hello James****
>
> ** **
>
> As I stated in my previous post, I asked for “Ideas.” I was hoping someone
> would post a long duration Audio File somewhere for me to download
> containing Aircraft and meteors, although I suppose I could mix 2 files
> together that have both. I could create code for SpecLAB only if I had
> sample audio recordings since there does not seem to be any beacons in my
> region. I am very good at coding but I need files to work on. ****
>
> ** **
>
> *From:* meteorobs-bounces at meteorobs.org [mailto:
> meteorobs-bounces at meteorobs.org] *On Behalf Of *James Beauchamp
> *Sent:* Friday, September 13, 2013 11:13 PM
> *To:* Meteor science and meteor observing; ernotp at gmail.com
> *Cc:* radiometeoren at vvs.be; cm2esp at gmail.com
> *Subject:* Re: (meteorobs) [radiometeoren] Re: Question about airplane
> and automatic counting Spectrum Lab****
>
> ** **
>
> Hi guys, ****
>
> ** **
>
> As someone who has been running a receiver with speclab for a few years
> now, but lacked the time to do the programming, I would suggest the
> following recommendation...****
>
> ** **
>
> Since the doppler solution will be a bistatic one, aircraft reflections
> will slowly change compared to those of meteor hits.  If you commonly get
> "head echo" hits prior to persistent echos from overdense events (sometimes
> you will get no persistence in small events, so it is the head echo only),
> you can use FFT bins from previous time slices to discriminate targets with
> long time constants from the short ones.  Aircraft will slowly change in
> frequency over time compared to meteors that suddenly appear with HIGH
> doppler rate head echos.****
>
> ** **
>
> It is a bit complicated on the code side, to which I am not experienced
> enough to help with recommended methods, but if i were a coding "god", i
> would average the bins in the time domain.****
>
> ** **
>
> Aircraft will exhibit slow frequency change from a high abscissa to a
> lower one, but will be slowly changing compared to meteor reflections.****
>
> ** **
>
> If, due to the lower base frequency, you get ONLY long-term reflections
> (no head echos) from the meteors, another discriminator could be the
> instantaneous appearance of an echo over several seconds.  Again, the code
> could use time-based binning of previous FFT's to identify sudden
> appearances of consistent-doppler signals.  This will be a bit more noisy,
> with a higher number of false targets from aircraft (due to fading as the
> reflections appear), but might be better value than nothing at all.****
>
> ** **
>
> Just a couple of thoughts...****
>
> ** **
>
> James****
>
> ** **
>
> ** **
> ------------------------------
>
> *From:* "maarten.vanleenhove at telenet.be" <maarten.vanleenhove at telenet.be>
> *To:* ernotp at gmail.com
> *Cc:* radiometeoren at vvs.be; cm2esp at gmail.com; Meteor science and meteor
> observing <meteorobs at meteorobs.org>
> *Sent:* Thursday, September 12, 2013 4:21 AM
> *Subject:* Re: (meteorobs) [radiometeoren] Re: Question about airplane
> and automatic counting Spectrum Lab****
>
> ** **
>
> If someone would find a solution for this, I 'd like to hear about it!****
>
> ** **
>
> kind regards,****
>
> ** **
>
> Maarten****
> ------------------------------
>
> *Van: *"ernottp" <ernotp at gmail.com>
> *Aan: *cm2esp at gmail.com
> *Cc: *"Meteor science and meteor observing" <meteorobs at meteorobs.org>,
> radiometeoren at vvs.be
> *Verzonden: *Donderdag 12 september 2013 10:58:45
> *Onderwerp: *[radiometeoren] Re:  Question about airplane and automatic
> counting Spectrum Lab****
>
> Hi,
> Maarten Vanleenhove wrote a script for Spectrum Lab in which he it tries
> to avoid false detections due to aircrafts.
> His url is:
> http://www.supernovae.be/meteorcounting
> However, errors occur.
>
> ****
>
> Following him: "When two aircrafts reflections merge, the script will,
> due to the signal width, assume a meteor was picked up. When large meteors
> appear, sometimes the meteors will be double counted"****
>
>
> I  do not use this script because we detect too many intersections of
> aircrafts (beacon at Dourbes in Belgium 49.97Mz)****
>
> Pierre Ernotte****
>
>
>
>
> ****
>
> ** **
>
> 2013/9/11 Raydel Abreu (CM2ESP) <cm2esp at gmail.com>****
>
> Hello all,****
>
> Recently, by September 6th I was able to migrate my radio forward scatter
> system from 187 MHz TV to 61 MHz TV. Obviously as the frequency is lower a
> very high increment in rates is present.****
>
> With the previous system a manual counting was performed so false
> positives by airplane traces were ignored. As my new system is peaking 150
> meteor traces by hour as an average manual counting is impossible.****
>
> A modified script for SpectrumLab based on the meteor_test distributed on
> the software installation package was written to track the weak but
> sporadic present direct signal carrier and it works very great.
>
> However, at least one or two times a day some airplanes gets into the
> working pass-band and produces a lot of false positives; producing false
> "hotspots" which difficult to identified as airplanes produced or real
> meteors outburst like the one recently detected by some members.****
>
> Any advice or tips??? Or a recommended better script to deal with this
> "airplane outburst". The happening of this problem is very seldom, but
> still affecting data quality. See efficiency and the "hotspots" in the
> attached picture.****
>
> Thanks and best wishes,****
>
> Raydel, CM2ESP****
>
> Havana, Cuba.
>
> ****
>
> ** **
>
> ** **
>
>
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>
> ****
> ------------------------------
>
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>
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