OPUS Processing Using the Emlid Reach RS2

In this article, we'll discuss common errors of OPUS processing using the Emlid Reach RS2 and walk you through how to make the necessary corrections so you can return to collecting data quickly.

Settings and Common Errors

The RTK settings should be set for ‘static’ and then select ‘GPS Only’ with an update rate of one hertz. OPUS only processes GPS, so adding other constellations will cause issues by having such a large file If for some reason you have stored other constellations, we can correct this later.

RTK Settings

In the logging settings, make sure raw data is off until you have the RS2 at the proper location. Once you set the RS2 in that location, power on the unit and set the raw data to RINEX 2.11.  Once you have finished collecting, turn raw data off, then power off the RS2. 


After storing your file, go to the OPUS website and upload your file.

OPUS Website

Set the antenna to EML_REACH_RS2_NONE. Set the antenna height, which is measured from the ground to the base of the antenna. Enter the email address where you want the result to be sent. Press upload to rapid static or static depending on the length of your collection.

If you receive upload errors or other processing errors, it’s often because the file is not prepared properly based on something such as the wrong RINEX file or not toggling raw data off before powering off.

OPUS Website Error

Error Remedies

To fix improper log starting and stopping, we’ll trim the ends of the RINEX file. First, we’ll open the RINEX file in a program such as Notepad and note the time of the first and last observations. In RTK converts, set the time a few minutes after the time of the first observation and set the time at a few minutes before the time of the last observations.

Trim Ends

Trim Ends 2

To fix any issue with too many constellations on, go to the option settings in RTK convert. Make sure the only satellite system chosen is GPS. The frequencies should be L1 and L2.

Turn Off Constellations

If you set raw data to RINEX v3.XX, go to the option settings in RTK convert and set the versions to 2.10 or 2.11.  Then press convert to generate a new file.

Convert RINEX 1

Convert RINEX 2

Process the new file in OPUS and OPUS will send an email with an OPUS solution or other errors that may result that may be related to data quality.

OPUS Website Success

If you'd like to see this presentation in video format, visit our YouTube page here

If you find you need further assistance processing OPUS on the RS2, please contact us and we'd be happy to set up a one-on-one session.