MGEX 数据下载

MGEX Data Holdings

The Multi-GNSS Experiment (MGEX) has been set-up by the IGS to track, collate and analyze all available GNSS signals. This includes signals from BeiDou, Galileo, QZSS, and IRNSS, as well as from modernized GPS and GLONASS satellites and any space-based augmentation system (SBAS) of interest. Analysis centers will attempt to estimate inter-system calibration biases, compare equipment performance and further develop processing software capable of handling multiple GNSS observation data.

Recent observation data of IGS multi-GNSS stations in RINEX3 format are available from the IGS global data centers

• Crustal Dynamics Data Information System (CDDIS)
• Institut Géographique National (IGN)
• Bundesamt für Kartographie und Geodäsie (BKG)

The RINEX 3 file names comprise a 9-char station+country identification, an 11-digit start epoch, as well as two 3-char/digit fields indicating the nominal duration and sampling. By way of example, MAS100ESP_R_20142350000_01D_30S_MO.crx.gz denotes a RINEX 3 gzipped daily, Hatanaka compressed observation file with 30-s sampling for the IGS MAS1 station in Spain. A detailed specification of the new file naming scheme is provided as part of the RINEX3 Standard. RINEX 2 files that reside in the same directory follow the old "8.3" naming scheme, e.g., mas12350.14d.Z. The archives provide daily RINEX files at 30 s update rate as well as high-rate (1 Hz) files for selected stations. An overview of tracked satellites and supported observation types for all MGEX stations is provided in a dedicated RINEX Observation File Summary maintained by the Astronomical Institute of the University of Bern.

Historic Data

Provision of MGEX observation data started with dedicated MGEX project directories at the global data centers. In the frame of the RINEX transition plan the IGS pursued the integration of multi-GNSS observation and navigation data in RINEX3 format and RINEX2 data from legacy stations in 2015/2016. Historic MGEX observation files back to 2012 and for individual stations and days even back to 2010 are available from

• Historic MGEX data at CDDIS
• Historic MGEX data at IGN
• Historic MGEX data at BKG

Notes

MGEX observation and navigation data are provided on a best-effort basis and may not offer the same level of consistency, quality and availability as legacy GPS/GLO data sets from the core IGS network. RINEX3 files in the MGEX repository may be generated

• within the receiver,
• from offline conversion of raw receiver data by the station provider using vendor-specific or proprietary offline tools, or
• from RTCM3-MSM real-time data streams using BKG's BNC software.

Furthermore, different generation methods may apply for daily and high-rate data files. Depending on the employed tool chain and software revisions, various deficiencies have occured that affect past and/or current data in the MGEFX archive. Users cannot presently expect full consistency of all data and literal adherence to the RINEX3 standard. Known problems include

• Insonsistency of implemented features and RINEX version number (3.01, 3.02, 3.03)
• Absence of mandatory header lines (e.g. phase alignment information or GLONASS slot numbers)
• Use of improper observation type designations (e.g., C5X instead of C5Q for pilot-only tracking of the L5/E5a signal)
• Differences in observation values between data from RTCM3-MSM streams and unprocessed receiver data.
• Inconsistent observation types for BeiDou B1 observations due to inconsistent definitions in recent RINEX versions (C2I in RINEX 3.01 and 3.03 vs. C1I in RINEX 3.02).

In addition, receiver-specific problems may result in a degraded measurement quality for some of the new signals and constellations. 

While an effort is made to continuously improve the overall quality and consistency of the MGEX data in cooperation with all providers, the MGEX project relies on volunteers and can't commit on fixing all problems on short notice. However, the feedback of all users is appreciated to document known issues and to share this infomarmation within the MGEX community.

Real-Time Data

Real-time data streams for a large fraction of MGEX stations are publicly available at the MGEX NTRIP caster of BKG. Information on accessing (or contributing) MGEX real-time streams is provided on the MGEX Real-time Streaming FAQ page of BKG.