Re: linux program

From: B Magnus B{ckstr|m (b@eta.chalmers.se)
Date: Sat Dec 15 2001 - 12:45:51 EST

  • Next message: Jonathan T Wojack: "Re: More GEO questions"

    On Wed, 12 Dec 2001, Roger wrote:
    > Hi,
    > I'm looking for a command line program that if given the TLE, time and
    > location (mine), would calculate the latitude and longitude of where directly 
    > over earth the object is.
    
    SatTrack has a few command-line utilities for pass prediction.
    
    Bester Tracking Systems (http://www.bester.com) seem to have removed the
    free version from their website, but it seems to be available
    ready-packaged for some systems:
    
    FreeBSD:
    ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/astro/sattrack-3.1.6.tgz
    
    Debian Linux:
    http://packages.debian.org/stable/hamradio/sattrack-x11.html
    
    > Short of that, where would I find the formula for calculating the location?
    
    The "formula" you're after is the SGP4/SDP4 satellite propagation model,
    which is documented in a number of places (check the FAQ), plus some
    vectorial computation to get the azimuth and elevation at a given time.
    
    If you're interested in writing your own program, you can have my C 
    language SGP4/SDP4 source code.  It's a translation of NORAD's Fortran
    code and isn't extensively tested.
    See http://www.eta.chalmers.se/~b/satlib/
    
    Happy hacking & clear skies,
    Magnus
    
    
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