On 3/30/19 10:42 AM, Tim Lister wrote:
On Sat, Mar 30, 2019 at 9:01 AM jimlux <[email protected]> wrote:
On 3/27/19 11:49 AM, coderman via time-nuts wrote:
Compiled the software, but...
he user specifies the GPS satellite constellation through a GPS broadcast
ephemeris file. The daily GPS broadcast ephemeris file (brdc) is a merge of the
individual site navigation files into one. The archive for the daily file is:
ftp://cddis.gsfc.nasa.gov/gnss/data/daily/
There's a ton of files under that.. broken down by year/day of year/ and
then some subdirectories with dozens of files, that appear to be RINEX
(the names are things like
ftp://cddis.gsfc.nasa.gov/gnss/data/daily/2019/088/19f/USN700USA_R_20190880000_01D_CN.rnx.gz
A casual browse did not find the brdc.
Yes the CDDIS holdings are not easy to find things in... The
organization from the data/daily/ is 4 digit year (e.g. '2019'), 3
digit day of the year. Then it's 2 digit truncated year, followed by
'n' (for 'n'avigation) e.g. '19n'. The brdc file is in there, and as
you say, is in RINEX format. The individual observations made by the
GNSS receiving sites live in the '19o' directories with a 4 letter
site code name.
Aha, I think I found it..
ftp://cddis.gsfc.nasa.gov/gnss/data/daily/2019/088/19n/
(for DOY 88)
There's a file called bdrc0880.19n.Z which unzips to bdrc0880.19n
it is buried in amongst all the station files.
And I assume that's what gets put in with the -e switch..
It starts:
"""
2 NAVIGATION DATA RINEX
VERSION / TYPE
CCRINEXN V1.6.0 UX CDDIS 30-MAR-19 12:31 PGM / RUN BY
/ DATE
IGS BROADCAST EPHEMERIS FILE COMMENT
0.1118D-07 0.7451D-08 -0.5960D-07 -0.5960D-07 ION ALPHA
0.9011D+05 0.1638D+05 -0.1966D+06 -0.6554D+05 ION BETA
0.745058059692D-08 0.159872115546D-13 61440 2047 DELTA-UTC:
A0,A1,T,W
18 LEAP
SECONDS
END OF
HEADER
"""
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
