Re: opensource_gps Digest, Vol 58, Issue 1

The formulas to compute satellite positions from almanac are in IS-GPS-200D 
(http://www.navcen.uscg.gov/gps/geninfo/IS-GPS-200D.pdf) in Table 20-IV.  To 
use almanac instead of ephemeris, just use 0's in place of paramters that 
are part of the ephemeris, but not included in the almanac.

John Lavrakas

----- Original Message ----- 
From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, May 06, 2009 12:00 PM
Subject: opensource_gps Digest, Vol 58, Issue 1


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>   1. The formula to derive coarse GPS Satelluite position from
>      Almanac (Johnson S)
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> Message: 1
> Date: Wed, 6 May 2009 10:34:53 -0600
> From: Johnson S <[email protected]>
> Subject: [OpenSource_GPS] The formula to derive coarse GPS Satelluite
> position from Almanac
> To: [email protected]
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> <[email protected]>
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>
> Hi there,
>
> I am reading the function  satpos_almanac at file gpsfuncs.c written by
> Clifford Kelley, and I really want to compare the software with the
> formulus. There are no formula/equations shown in GPS ICD to derive coarse
> GPS Satelluite position from Almanac data. Could anybody please show me a
> link or any information?
>
> Thank you very much.
>
> JL
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