[IGSMAIL-3082]: Near Real Time Products from JPL

[Michael B Heflin]

******************************************************************************
IGS Electronic Mail      30 Oct 16:45:51 PST 2000      Message Number 3082
******************************************************************************

Author:  M B Heflin

Near real time GPS orbit and clock solutions with 15 minute latency are now
produced at JPL with the Real-Time GIPSY (RTG) software.  The new products can
be found at ftp://sideshow.jpl.nasa.gov/pub/15min.  The directory contains two 
sp3 files that are updated every 15 minutes. The file named 15min.sp3 contains
the 15 most recent 1 minute orbit and clock estimates.  The second file named
<yyyy>-<mm>-<dd>.sp3 contains the most recent entries for that day and results
from the previous day. (<yyyy> is the 4-digit year, <mm> is the 2-digit month,
and <dd> the 2-digit day of month.)  Comparisons with our current final IGS 
orbits show agreement at the level of 30-40 cm 3DRMS.

These products are still experimental.  In the near future we intend to provide
Earth orientation parameters and ECI representation of the products in support
of GIPSY users.