rinex and RNXSSF
dacodac
who is?
ciao!
Sam Wormley
GUIDE FOR UTILIZING RINEX DATE IN TRIMBLE'S PFINDER SOFTWARE
============================================================
Trimble Pathfinder receivers use PFINDER or GEO-PC software to
produce differentially-corrected positions (GEO-PC is a subset of
the PFINDER software suite that comes standard with GEO-Explorer
receivers). This software requires base station data in one of
two proprietary Trimble data formats: .SSF or .DAT and can import
RINEX.
RINEX is an internationally-agreed format for exchange of GPS
data. Maintaining three separate data products on-line is
awkward, inefficient, and highly redundant. SRMB consulted the
user-community and made the decision to offer RINEX data only in
the following data-rate and frequency formats:
1 second dual-frequency
1 second single-frequency
5 second dual-frequency
5 second single-frequency
15 second dual-frequency
10 second dual-frequency
Typical Pathfinder users will utilize the 1 second and 5 second
single-frequency data as a source of differential corrections.
This document describes the process for accessing the BC-ACS
RINEX data and using within PFINDER software.
Step 1: Download
a) Determine the hours of base station data required (remember
that the BC-ACS files are referenced by UT, NOT local time).
b) Log-on to the BC-ACS system, and select the correct "area" for
data download (i.e. 5 single-frequency, 1 second single-frequency, etc.).
c) Download the required files. An example 5 second single-frequency
file from the Victoria ACP on September 15th GMT hour 22 would be:
V1091522.05S
d) Log-off
Step 2: Un-Compress, Convert, Combine and Correct
a) The compressed files have extensions that indicate the data
rate and frequency format. These file extensions should be
changed before un-compressing. The DOS command shown below
will rename all files with the extension .O5S to .ZIP within
a particular directory. The original file prefixes will
remain the same.
REN *.O5S *.ZIP <ENTER>
b) Uncompress all files using the PKUNZIP utility.
PKUNZIP *.ZIP <ENTER>
Each .ZIP file will expand into two RINEX files: an
observation file (pseudorange, carrier-phrase, and doppler
observables), and a navigation file (ephemeris and
ionospheric data). Both files will have the same file
prefix as the .ZIP file, with the observation file extension
being the data rate and frequency (ex. *.O5S), and the
navigation file extension being .NAV.
c) Convert all hourly RINEX files to Trimble .SSF files. This
is done utilizing Trimble's stand-alone utility RNXSSF. A
typical process is shown below (see the PFINDER manuals for
more details).
RNXSSF /oV1091522.05S /nV1091522.NAV /sV1091522.SSF <ENTER>
d) Combine the hourly .SSF files into a single file. This can
be done from within PFINDER (Utils/Combine SSF Files...), or
using the stand-alone utility MULTISSF. A typical process
is shown below to chronologically sort all .SSF files
beginning with the prefix V10915, and resulting in a single
"day " file with the filename V10915.SSF (see the PFINDER
manuals for more details).
MULTISSF /t V10915??.SSF /oV10915.SSF <ENTER>
d) Correct the single "day" base station .SSF file coordinates.
This can be done from with PFINDER (Utils/Reference
Position...), or using the stand-alone utility SSFREF. A
typical process is shown below (see the PFINDER manuals for
more details and check for precise antennae phrase-center
coordinates from the BC-ACS "site files).
SSFREF V10915.SSF /lat"48 25 49.593" /lon"-123 21 53.650" /alt"27.72" <ENTER>
Step 3: PFINDER Processing and Cleanup
a) Process differential corrections using PFINDER and the
single "day" base station .SSF file.
b) If all processing appears normal, cleanup the directory by
removing the intermediate files that are no longer needed.
This can include deleting all .ZIP, 05S, and .NAV FILES. As
well, the hourly .SSF files can be deleted (but be careful
not to delete the "day" base station .SSF file or rover
files).
Notes:
* An experienced DOS user will be able to automate much of
this process via .BAT files configured for the particular
way they prefer to work.
* The RNXSSF utility should give the following message:
Data types found in file:
L1 CA code Pseudorange...
L1 Doppler...
L1 Carrier phrase...
etc.
* This indicates normal conversion from RINEX to .SSF. If
this message does not appear, contact SRMB.
* The RNXSSF utility gives warning messages when the doppler
changes signs (at closest approach of the satellite). This
is OK...no data is being changed internally.
* A current version of PKUNZIP is available for download from
the BC-ACS.
dacodac
"Sam Wormley" <swor...@mchsi.com> ha scritto nel messaggio
news:fAZne.9432$x96.5580@attbi_s72...
ok, this is the first one.
But, where is RNXSSF?
Sure not in my Pathfinder 2.9 SW :-((
grazie!