Rinex Format; Novatel Logs For Rinex Conversion - Novatel OEM Series User Manual

Chapter 7
7.3.1

Rinex Format

The Receiver-Independent Exchange (RINEX) format is a broadly-accepted, receiver-independent
format for storing GPS data. It features a non-proprietary ASCII file format that can be used to
combine or process data generated by receivers made by different manufacturers. RINEX was
originally developed at the Astronomical Institute of the University of Berne. There are three different
RINEX file types. Each of the file types consists of a header section and a data section, and includes
the following information
• observation files (carrier-phase measurements; pseudorange / code measurements; times of
observations)
• broadcast navigation message files (orbit data for the satellites tracked; satellite clock
parameters; satellite health condition; expected accuracy of pseudorange measurements;
parameters of single-frequency ionospheric delay model; correction terms relating GPS time
to UTC)
• meteorological data files (barometric pressure; dry air temperature; relative humidity; zenith
wet tropospheric path delay; time tags)
Although RINEX is intended to be a receiver-independent format, there are many optional
records and fields. Please keep this in mind when combining NovAtel and non-NovAtel RINEX
data.
The Convert4 utility can be used to produce RINEX files from NovAtel receiver data files.
Selecting the Rinex field, see Figure 28 on Page 91, in the Convert To group box causes:
1. The Destination File: field to be replaced by Observation File: and Ephemeris File: fields.
Note that "Observation File" refers to the RINEX OBS file, and "Ephemeris File" refers to the
RINEX NAV file.
2. The RINEX Headers group box to appear near the bottom of the dialog. This allows you to
supply additional information that will appear in the header records of the RINEX output files
(e.g. Company Name, Marker Name, Marker Number).
For best results, the NovAtel receiver input data file should contain the logs as in Table 18.
RANGEA/B,
or RANGECMPA/B
BESTPOSA/B
IONUTCA/B
RAWEPHEMA/B
VERSION
1. For further information on RINEX Version 2 file descriptions, you may wish to consult
relevant articles in scientific journal such as: Gurtner, W.G. Mader (1990): "Receiver
Independent Exchange Format Version 2." CSTG GPS Bulletin Vol. 3 No. 3, Sept/Oct 1990,
National Geodetic Survey, Rockville.
92
1
:
Table 18: NovAtel Logs for Rinex Conversion
NovAtel OEM4 Family Log
OEM4 Family Installation and Operation User Manual Rev 12
PC Software and Firmware
Recommended Trigger
ontime 15
once
onchanged
onchanged
once