Product quality is monitored by the Real-time Analysis Center Coordinator. The IGS RTS products are a continuation of products developed during the span of the IGS Real Time Pilot Project (RTPP). Details of this project can be found at http://www.rtigs.net. The IGS01/IGC01 product has been available within the RTPP since the beginning of 2010. Prior to that, a batch product using the same techniques was generated from daily file submissions of the ACs since mid-2008.

The continuous history of the performance of the IGS01 product shows that since spring of 2011, when a new outlier detection algorithm was implemented, the product has been very stable with clock standard deviations (sigma) of 0.1-0.15 ns. Performance comparisons are performed daily against the IGS rapid solution.

Performance comparisons are performed daily against the IGS rapid solution. The comparison plots are available here:


IGS01 Clock SD



IGS01 orbit



IGS02 Clock SD



IGS02 orbit



IGS03 Clock SD



IGS03 Orbit


Typical results are shown in the plot below, which also indicates the impact on the statistics of certain satellite-specific events.

Daily comparison reports

Daily comparison reports of clocks from different Analysis Centers are made available for download from IGS Global Data Centers:

Availability of Service

Availability of Service Figure

In order to ensure robust distribution of the IGS RT products, and to maximize availability, a redundancy concept has been designed and implemented by the RTACC and the IGS Working group. The concept is illustrated in the Availability of Service figure. It relies on the parallel generation of each combination product on LINUX servers at two or more independent combination centers. In addition, the Analysis Centers themselves make their solutions available at two or more NTRIP casters.

The combinations are performed independently at each combination center and are then sent out as RTCM streams to two or more dissemination casters. What is important is that each caster mount point is supplied by two or more combination centers at the same time. If one combination center is unavailable, stream distribution switches automatically to the second combination center, without the user being aware of the switch.

If one dissemination caster is unavailable, the user will see an interruption in service. It is up to the user to switch to a second dissemination caster to resume receiving the product stream. It is also up to the user to establish procedures and software to allow reception of the streams from two or more dissemination casters simultaneously, to enable seamless processing in case one of the casters is unavailable.

PPP Performance

Monitoring of Precise Point Positioning (PPP) performance which may be expected by users under different scenarios is carried out by BKG. The following charts show 24h time series' of position displacements that may be expected when using the RTS products.

Recent PPP performance of product stream IGS01 Recent PPP performance of product stream IGS02

Recent PPP performance of product stream IGS03

The chart below shows an example 30/90 day time series of daily 2D-RMS position errors that can be expected from kinematic PPP using RTS at a station in Frankfurt Germany. Historical PPP performance information is available for download from ftp://igs.bkg.bund.de/NTRIP/ppp.

30 days' time series' of 2D-RMS 90 days' time series' of 2D-RMS
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