(meteorobs) Radio Meteor positioning???

[James Beauchamp]

Hi Raydel, 
 
I had looked at this a few years ago.  There are a couple of options you may be able to model...

1.  Frequency Domain.  If the location of the transmitter and recievers are known, and the target is moving, you can solve using the doppler shift (Range Rate).  In a bi-static topology, the solution would be the intersection of the doppler planes.  The only drawback is that you need a set of receivers with very good frequency stability - (or if you can see the carrier, a good method to extract the dF = Fn - F0 value) and the ambiguities would require heavy analysis.  When i put the idea down on paper a few years ago, i didn't go very deep on the options and deep calculations, so there are probably several ways to do it.  initially, I started with the idea of Geodetic to ECEF, solving for the intersections of the doppler planes, and then translating back to geo.  It gets hairy with all the doppler skew.  You might also be able to apply some advanced ray-trace or polarmetric methods, maybe even doing something exotic with local level coordinates along the
 TX-RX intersection lines.  The biggest challenge is the velocity.  But this should be solvable with m >> n stations and statistical work.

2.  Time.  Probably too complex and expensive to do with hobby equipment, but much easier on the processing side.  The bistatic range is measured directly instead of estimated, and velocity induced ambiguities are minimized.  But the expense is high.

Again, i didn't dive too deeply in it.  Sounds like a great idea for a scientific paper - if at least to introduce the possible options.



--- On Wed, 4/24/13, Raydel Abreu (CM2ESP) <cm2esp at gmail.com> wrote:


From: Raydel Abreu (CM2ESP) <cm2esp at gmail.com>
Subject: (meteorobs) Radio Meteor positioning???
To: "Meteor science and meteor observing" <meteorobs at meteorobs.org>
Date: Wednesday, April 24, 2013, 1:54 PM



Hello,


Thanks to everyone for previous support... Now i am thinking in big. Does anyone can help with the required equations for determinate the meteor trail echo based on multistatic systems. After checking for a while on the internet i found many interesting papers of multistatic system target positioning, but the knowledge level required is a little too high for me.


Does anyone know about this and can give me some reduced and basics equations. I am thinking in a "doppler only" system using one of the two following scenarios: 1-) Two distant transmitters and two co-located receivers. 2-) One distant transmitter and two (or more) distant receivers.


>From all papers found the one attached seems to have the easiest to understand equations on pages 1 and 2, but this is still to high level science for me, can please someone help me in adapt equations for any of the two proposed scenarios and writed in a step to step way?


I am trying to recruit some physics co-workers to help me to implement a simple software that given the transmitter(s) - receiver(s) parameters and receiver doppler shifts can produce a low but yet enough precision echoe location to attempt to identify the meteor radiant.


Thanks,


Raydel


-----Inline Attachment Follows-----


_______________________________________________
meteorobs mailing list
meteorobs at meteorobs.org
http://lists.meteorobs.org/mailman/listinfo/meteorobs