I have acquired GPS raw data from the Ublox Neo-6m module. Upon logging the raw data, it came to me as NMEA data. I want to postprocess those data in Matlab. Usually, Rinex observation data is processed, but how do I post-process NMEA data on Matlab without a Rinex file, or is there any procedure to convert those NMEA data to Rinex?
To convert NMEA data to a RINEX observation file, you will need software or tools that can perform this conversion. Use the tool "teqc" (Translation, Editing, and Quality Checking) which is widely used for GNSS data processing.
"teqc -O.obs output.obs input.nmea"- use this code to convert NMEA to Rinex in the "tecq" tool.
No, it is not possible to do post-processing using NMEA output only. NMEA is a text-based protocol that is used to transmit GNSS data in real time. It does not contain the raw measurements that are needed for post-processing, such as the pseudoranges and phases.
There are a few approaches to converting NMEA data to a RINEX observation file. One approach is to use a software program that can decode the NMEA data and output it in RINEX format. There are many different software programs available, such as Emlid Studio, Trimble Convert to RINEX, and Topcon TPS2RIN.
Another approach is to use a web-based converter. There are a few different web-based converters available, such as the one provided by the National Geodetic Survey (NGS).
The specific steps involved in converting NMEA data to RINEX format will vary depending on the software or web-based converter that you are using. However, the general steps are as follows:
The converted RINEX file will be saved to your computer. You can then use this file for post-processing or other purposes.
Here are some additional things to keep in mind when converting NMEA data to RINEX format:
- The NMEA data file must be in a supported format.
- The software or web-based converter that you are using must be compatible with the NMEA data file format.
- The output RINEX file will be created in the same directory as the input NMEA data file.
- The accuracy of the output RINEX file will depend on the quality of the input NMEA data file.
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