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| sci.geo.satellite-nav (Global Satellite Navigation) (sci.geo.satellite-nav) Discussion of global navigation satellite systems (GNSS). Topics include the technical aspects of GNSS operation, user experiences in the use of GNSS, information regarding GNSS products and discussion of GNSS policy (such as GPS selective availability). |
| Tags: aep, after, almanacs, different, sem, yuma |
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#1
June 15th 08, 12:15 PM
posted to sci.geo.satellite-nav
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SEM and YUMA almanacs are different after AEP
Last July, if you compared the orbit generated by a SEM and YUMA
almanac, you'd get orbits that were the same to under a meter. Now, these orbits are different by dozens of meters. The new AEP process has changed (read broken) how almanacs are created. The almanacs are still within the gross positioning requirements though, so this issue may never get fixed. See here for analysis: http://blogs.agi.com/navigationAccuracy/?p=65. -Ted 
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