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

Jay Salsburg jsalsburg at bellsouth.net
Fri Sep 13 15:11:07 EDT 2013

From: Jay Salsburg [mailto:jsalsburg at bellsouth.net] 
Sent: Friday, September 13, 2013 12:57 PM
To: 'radioastronomie at dl6ebs.de'
Subject: RE: [radiometeoren] Re: Re: Re: Re: Question about airplane and automatic counting Spectrum Lab


2 Years ago I perfected an Algorithm that reliably detects Sirens using MatLAB. My Algorithm could be adapted to SpecLAB MACROs rejecting the Aircraft signals. The principle is sound and fool proof; analyze the up and down slope character of the amplitude in adjacent bins, then match the slope changes to predictable rates of change. I could reliably detect Sirens 400 meters away in a Microphone mounted outside an automobile going the speed limit on a freeway. My problem is that I do not have any beacons near me from which to harvest test recordings. Any ideas?


From: radioastronomie at dl6ebs.de [mailto:radioastronomie at dl6ebs.de] 
Sent: Thursday, September 12, 2013 3:12 PM
To: Jean-L. AGR; radiometeoren at vvs.be
Subject: [radiometeoren] Re: Re: Re: Re: Question about airplane and automatic counting Spectrum Lab


Hello Jean, 


you can try my script. This script Count only, if a Signal has more than 15hz drift. Maybe you can use the 20Hz to supress more planes. With this script you Count Meteors only, that produce more than 15/20hz frequency drift.

please edit the

1.	Audiochannel
2.	target Folder  ( if( (val(h1,"####")==5955)&&(b1==0) ) then fopen1("C:\\RA\\CLab_Channel1\\data\\RMOB-)








Von: Jean-L. RAULT
Gesendet: ‎Donnerstag‎, ‎12‎. ‎September‎ ‎2013 ‎17‎:‎18
An: ernotp at gmail.com
Cc: radiometeoren at vvs.be; cm2esp at gmail.com


Hi Pierre

I wonder if any software will be able one day to count meteors on my Graves radar echoes, here near Paris :o))

Kind regards




Van: "ernottp"  <mailto:ernotp at gmail.com> <ernotp at gmail.com>
Aan: cm2esp at gmail.com
Cc: "Meteor science and meteor observing"  <mailto:meteorobs at meteorobs.org> <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

Maarten Vanleenhove wrote a script for Spectrum Lab in which he it tries to avoid false detections due to aircrafts.
His url is:
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




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