High-rate MGEX GNSS Observations, DLR Broadcast Ephemeris, and Unicore PPP-B2b Corrections Dataset (for B2bPPP& Rtklib Post-processing)

This dataset provides a comprehensive collection of GNSS data gathered from Day of Year (DOY) 065 to 068, 2025 (March 6th to March 9th, 2025), designed for post-processing Precise Point Positioning (PPP) analysis, particularly focusing on the evaluation and utilization of PPP-B2b correction services.

The dataset comprises three main types of data, organized into separate folders:

1. High-Rate Multi-GNSS Observation Data (Obs/):

   • Contains daily observation files from three International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) stations: gamg, ulab, and wuh2.
   • Covers DOY 065-067, 2025.
   • Data is provided at a high sampling rate (1HZ).The 1 Hz observation data, downloaded from MGEX in 15-minute interval files, were merged into daily files using gfzrnx (version 2.0-8219_win10_64).
   • Files are in the standard Hatanaka-compressed RINEX observation format (version 3 assumed), using the naming convention SSSSDDD0.YYh (e.g., gamg0650.25h). SSSS denotes the station ID, DDD the DOY, and YY the 2-digit year.
   • Includes observations from available GNSS constellations (GPS, GLONASS, Galileo, BeiDou, etc.) tracked by these MGEX sites.

2. Multi-GNSS Broadcast Ephemeris (Nav/):

   • Contains daily combined broadcast ephemeris files, sourced from the German Aerospace Center (DLR).
   • Covers DOY 065-068, 2025.
   • Files are provided in the standard RINEX navigation message format (version 4 assumed for brd4 prefix), using the naming convention brd4DDD0.YYp (e.g., brd40650.25p).

3. PPP-B2b Correction Data (PPP-B2b(Unicore)/ ):

   • Contains daily files of PPP-B2b correction data streams as logged directly by a Unicore Communications GNSS receiver.
   • Covers DOY 065-068, 2025.
   • Files use the naming convention YYYYDDD.B2b (e.g., 2025065.B2b), where YYYY is the 4-digit year and DDD is the DOY. The .B2b format represents the specific raw data stream logged by the receiver containing the corrections broadcast via the BeiDou GEO satellites.