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[aprssig] RE: Marrying Doppler & APRS

Steve Noskowicz noskosteve at yahoo.com
Mon Mar 20 22:00:13 UTC 2006


Gents,             [[ long-ish ]]

        I may have said that I am aware of the APRS bearing reporting, but that's the extent of my knowledge.  That it exists along with the quality and s-meter info.
   
  >>From: "Curt, WE7U" <archer at eskimo.com>
  >> You mean like Xastir? <http://www.xastir.org>  
  >> Does the mapping and APRS stuff already.  
   
   Don't know.   If I have time I'll do a little looking, but 
  right now, I have only seen references to Xastir.  I can't 
  ven say it... (;-)
   
   
  >> I'm an engineer and a "software-head".  
  >> Xastir is done in 'C'.
   
  I don't DO C.  Looks like gibberish to me (:-)  I'm an RF 
  Engineer turned to the dark side (management). 
   
  VK3ZPF's Vector-Fox system basically plots a bearing line 
  with each push of a button and you see them all on the 
  map and do a mental intersection determination.
  > http://www.qsl.net/vk3zpf/index.html
   
  >> ...have full mapping APRS systems in the vehicles ...
  >> a stationary mapping system with the RDF units mobile. 
  >> you're ...doing away with the maps and having  
  >> software... calculate the fox's location?
   
  You got it.  The calculation part is trivial, even with a 
  eighting factor  (yea! Soze brain surgery...when you know how).  You can get a cross hairs on a map and the GPS coordinates.  With the info sent via APRS, anyone with the capability can grab the fixes and have his very own bulls-eye.
       
   
      Out of curiosity, what *IS* your weapon(s) of choice?
   
  U didn't answer this Q...
   
   
  >>>  Which Doppler is in your basement?
  >>    It is an old Doppler Systems 4000.... I
  >> am interested in your project.  
   
  Not familiar with 'em all...  (:- (
   
   
  >> I asume 
  >> You are aware of the work done in England.
  >> www.gpss.tripoduk.com/usadown.htm .
   
    I am now!  Or will be shortly...
   
  ... Boy! I wish folks would remember to trim their posts.  
  This digest thing it a pain....
   
  From: "Robert Bruninga" <bruninga at usna.edu>
   
  ...  The distance field is important to limit the bearing 
  lines to only that area of interest and not infinitly long.
   ... This vastly improves the visibility of the maps  ... 
  an observer looking at a 128 mile range scale map would 
  see total gyberish, 
   
  As usual, Bob, a good idea.  Right now my current proto 
  has variables for fix vector-length.  If I get to where 
  I can put soft maps in (as opposed to just pasting a 
  GIF into Excel), This'll be a consideration.
    ==========================================
   73, Steve, K9DCI
   
  P.S. because I have several takers on the spreadsheet, 
  I'll post the TS-2000 version in teh Files area, though 
  it is also in the Yahoo Group "ts2000_programming" 
  Files area.  The one here has a few added comments 
  in the instructions (sheet 1)
   

		
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