Re: Potential Problems with Meade Software for Satellite Tracking

From: Large mails (b.gimle@comhem.se)
Date: Mon Mar 30 2009 - 07:22:10 UTC

  • Next message: Russell Eberst: "2009MAR29.OBS"

    I agree (with the worst scenario)!
    
    I have made dozens of test runs with both LEO,HEO and GEO, and comparing 
    displayed positions to output from reliable prediction programs.
    At first reading the display, later with an ASCOM program designed to log 
    time and position when pressing SPACE on a connected PC.
    In all cases position errors were 1-5 degrees.
    
    Your theory appears correct - it could also explain my suspicion that it 
    doesn't correct for Earth rotation - noticable if the satellite is 
    considerably early or late.
    (Which was my primary reason for buying a scope with tracking!)
    I gave up trying after several firmware upgrades didn't correct the problem.
    Now I use Boshart's SatTrack  (LXSAT) that tracks high objects OK, but I'm 
    not yet convinced about early-late sats.
    
    It would be nice though to be able to upload elsets into the Autostar, to be 
    usable for a few days, and not having to expose the laptop to dew and cold.
    
    /Björn
    
    ----- Original Message ----- 
    
    > Has anyone noticed how the Meade software does not track geosats? It
    > point where it thinks the geosat is, based on the TLE, then moves East
    > (and down) as time advances, as if there is a time term missing that
    > should be correcting the position to stay where it it. ...
    
    > Second, does the error start when the calculations are first made or
    > when the telescope is first pointed? Both of these problems impact not
    > only tracking geosats but probably LEOs as well. 
    
    
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