You need to write or use your own code for that. Also, most GPS receivers come with associated software usually includes data logging and conversion packages. Theses converters, however, often convert data into ASCII or text format not Matlab files.

i think you first you need to know that the Rinex is composed of four different data files groups and they are all mostly ASCII format logged:

1. Observation Data File 2. Navigation Message File 3. Meteorological Data File 4. GLONASS Navigation Message File

if you were interested in navigation message files you should first as Malek karaim told you build your own code to separate the header part from the data part and then check the data format.

i have attached a link in which i think is very helpful to revise the Rinex files and more you can use the format you interested in and build a code to extract the useful information for you.

If you convert your observation file to RINEX v3, then you can use OBSRNX class from GNSS-Toolbox repository available here:

https://github.com/spanikp/GNSS-toolbox/blob/master/src/loading-utils/rnx-obs/OBSRNX.m

Usage: o = OBSRNX(pathToYourRinexV3File)

It works for observation RINEX v3 files only. In the toolbox you can find also other functions to read GNSS data formats. Any comments are welcome :)

There are some dependecies, so first read:

https://github.com/spanikp/GNSS-toolbox/blob/master/README.md

I have .rnx file

how i can get S4 index

Hi, I have the RINEX version 3.02, how can I extract from it the position of the satellites?

Thanks.