estimated orbit for NAVSTAR 56 (USA 180) using almanac data

From: Kevin Fetter (kfetter@yahoo.com)
Date: Tue Nov 23 2004 - 08:51:31 EST

  • Next message: Leo Barhorst: "LB obs 2004-11-14; NEW Chinese flasher"

    I used a program called ALM2TLE from
    
    http://www.geocities.com/kiwi_36_nz/alm2tle/alm2tle.htm
    
    to convert the Yuma almanac data from
    
    http://www.navcen.uscg.gov/gps/almanacs.htm
    
    I used the data in the 327.ALM file
    
    http://www.navcen.uscg.gov/ftp/GPS/archives/yuma/327.ALM
    
    And got the following for PRN 2 = NAVSTAR 56 (USA 180)
    
    GPS PRN=02
    1 00002U 00  0  0 04329.69758772  .00000000  00000-0  00000-0 0  0004
    2 00002  54.8641 285.1031 0115895 107.9364  47.3126  2.01378381 00007
    
    So while it's active, it's not at the typical mean motion for gps satellites. So to me it still
    drifting. 
    
    Here's the results I got with  PRN 24=NAVSTAR 23 (USA 71), using the data in
    
    http://www.navcen.uscg.gov/ftp/GPS/archives/yuma/324.ALM
    
    GPS PRN=24
    1 00024U 00  0  0 04326.71092105  .00000000  00000-0  00000-0 0  0009
    2 00024  55.4313 288.0119 0095448 282.5282 261.8924  2.00562181 00004
    
    Compared to the tle from the oig
    
    PRN 24
    1 21552U 91047A   04326.95263297 -.00000067  00000-0  00000+0 0  3407
    2 21552  55.4331 288.0311 0097502 282.1137  76.7751  2.00556755 98047
    
    So it good enough to tell where it approx is.
    
    Kevin
    
    
    
    		
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