RINEX 3.02

Using RINEX 3.02 as Base Corrections for RESEPI

Purpose: To understand how to use RINEX data as base corrections when processing data with Inertial Labs RESEPI PCMaster software.
Last Updated: July 2021

In the intricate realm of geospatial data analysis and satellite navigation, the accuracy of positional information is paramount. As professionals and enthusiasts strive to achieve the highest fidelity in location-based services, the need for precise base corrections has become increasingly essential. Enter the Radio Navigation Systems (RINEX) data format—an open data format that is the de facto standard for storing and disseminating raw satellite navigation system data. Integrating RINEX 3.02 data for base corrections is a sophisticated process, which, when executed with finesse, can dramatically enhance the quality of data processed with advanced tools such as the Inertial Labs RESEPI PCMaster software.

This article delves into the methodological intricacies of utilizing RINEX data within the RESEPI PCMaster suite, a leading-edge software designed for comprehensive data processing in the context of inertial navigation systems. We will explore the foundational concepts of RINEX data, its critical role in improving differential GNSS (Global Navigation Satellite System) corrections, and the step-by-step procedure to apply these corrections effectively. By the end of this discourse, readers will not only appreciate the complexities of high-precision navigation but will also be equipped with the practical knowledge to harness the full potential of RINEX data as base corrections, thus elevating the accuracy of their geospatial projects to new heights.

Inertial Labs’ PCMaster software, powered by Waypoint® Inertial Explorer from Hexagon | NovAtel ®, is Inertial Labs’ point cloud generation software. PCMaster allows users to generate PPK-corrected trajectories automatically. When a PPK trajectory is not detected in a project, the trajectory generator will automatically begin to run, and the first thing it will ask for is the base corrections file. 

For users who want to use RINEX 3.02 and newer files for base corrections, you will need to make the following modifications to the files.

Below is an example using RINEX files from a public base station from the EUREF GNSS network.

The file ending in MO is the mixed observations file, the file ending in RN is the GLONASS navigation file, the file labeled GN is the GPS navigation file, and the file ending in EN is the Galileo navigation file. After extracting these files, rename the mixed observation file with a .21d extension. Rename the GLONASS navigation file to have a .21g file extension, rename the GPS navigation file to have a .21n file extension, and rename the Galileo navigation file to have a .21e file extension. An example of this process is shown below.

When processing data in PCMaster, have all these files in the flight folder. When PCMaster prompts you for the base measurements file, as shown below, select the mixed observation file, which is the file with a .21d extension. PCMaster will automatically reference the other navigation RINEX files when converting and resampling the base file.

From there, the base file will be converted and resampled, and your corrected trajectory will begin to be generated.

In conclusion, harnessing RINEX data for base corrections is a vital step in enhancing the accuracy of position and navigation solutions obtained from Inertial Labs RESEPI PCMaster software. Through the integration of RINEX data, users can correct for various errors inherent in raw GNSS measurements, such as satellite orbit biases, clock drift, and atmospheric disturbances, thereby significantly refining the quality of the data processed by the Inertial Labs systems.

The adaptability of the RESEPI PCMaster software in accepting RINEX format input allows for a seamless correction process, making it accessible even to those with limited GNSS backgrounds. This process is a testament to the flexibility of the software but also highlights the importance of open-format data in GNSS data processing.

Moreover, using RINEX data as base corrections underscores the importance of precise timing and positional information in many applications — from geospatial analysis and surveying to autonomous vehicle navigation. By leveraging Inertial Labs’ advanced algorithms and the comprehensive correction data provided by RINEX files, users can achieve a new level of confidence in their data’s integrity.

Future advancements may streamline this process even further, but for now, the ability to utilize RINEX data with the RESEPI PCMaster software represents a powerful tool for professionals across various industries. This integration exemplifies the innovative spirit of Inertial Labs, highlighting their commitment to providing accurate, reliable, and user-friendly solutions for complex navigational challenges. Users looking to capitalize on the full potential of their Inertial Labs systems will find that understanding and applying RINEX base corrections is an invaluable skill in their repertoire, ensuring the highest possible accuracy in their positional data and analysis.

For any additional questions, please email support@inertiallabs.com

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