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PPK (Post-Processed Kinematics) and RTK (Real-Time Kinematics) are methods to enhance GPS accuracy. Consider PPK over RTK for remote areas without cellular coverage, extended flight missions, and projects needing high data integrity. PPK offers improved accuracy and flexibility without the need for real-time communication or additional hardware. It’s suitable for critical applications and achieves high accuracy levels through post-processing techniques. Choose PPK when real-time corrections aren’t possible, or when the highest accuracy and data integrity are crucial.

In some cases no, in other yes:

With PPK, GNSS RINEX data is logged onboard the device (such as a drone) during the data collection process. After the flight or data collection is completed, the logged RINEX data is post-processed using REDtoolbox software, along with data from reference stations (base stations). This post-processing step corrects errors in the GNSS data and enhances its accuracy.

Therefore, while PPK does not require a base station during data collection, it does require access to accurate reference data (RINEX data) for post-processing. This reference data can come from various sources, including CORS networks, GNSS rovers, GNSS base stations, or virtual reference stations (VRS). The availability and accessibility of reference data may vary depending on the location and specific requirements of the project.

There are several tutorials and we provide some amount of support for free.

However, to fully harness the capabilities of REDtoolbox PPK software, users are encouraged to participate in dedicated training sessions. These classes offer comprehensive instruction on utilizing REDtoolbox PPK effectively, covering essential topics such as data collection techniques, post-processing methodologies, and Photogrammetry software functionalities specific to REDtoolbox. Through hands-on training, participants gain practical experience navigating the software’s interface, interpreting results, and troubleshooting potential issues. Furthermore, these sessions provide insights into optimizing data accuracy and leveraging REDtoolbox PPK’s features across diverse applications in fields such as drone mapping, surveying, and geospatial analysis. By investing in training tailored to REDtoolbox PPK software, users can enhance their proficiency and confidence in utilizing this powerful tool to its fullest potential, resulting in more accurate and reliable geospatial data outputs for their projects.

No.

REDtoolbox works in GNSS native coordinate system WGS84 using elliptical heights.

Geoids are implemented for vertical correction, but not horizontal coordinate transformation parameters from as most of the nation wide EPSG library coordinate systems definitions are not accurate enough for surveying. See epsg.io to get an idea if your coordinate system is accurate or not. Like epsg 31255 with 0.5m accuracy only.

YES. 

File like *.24o are the observations files including the signal raw measurements for each GNSS satellite.

The *.24n / *.24g *.24p files are the navigation files, including the ephemerides data of the satellites.

if files are named *24p you are lucky: This files are related to RINEX 3.x and contain information on GPS, GLONASS, Beidou and Galileo satellites. If you have multiple files, like 24n, 24g, 24l, 24e you are using an outdated RINEX 2.x format which should be avoided. REDtoolbox can handle it, but it is not recommended.

No.

REDtoolbox can not create virtualRINEX base stations based on RINEX data from two different physical locations from the same time span.