RTS Monitoring

RTS

RTS Monitoring

RT Product Monitoring

The IGS RTS provides access to real-time precise products such as orbits, clocks, code and phase biases, which can be used as a substitute for ultra-rapid products in real-time applications. The true performance of these products can be assessed by the daily statistics derived from the comparison with IGS rapid products.

The current RTS product monitoring is based on comparisons performed by the RTACC. IGS Analysis Center CODE rapid products for GPS, Galileo and GLONASS with a time resolution of 30s are used for the monitoring and comparison purposes.

BKG has developed a combination technique based on a Kalman filter with benefits which is able to deal with outages and offsets in individual RTAC solutions. This approach has been used already for many years with IGS RTS. In order to satisfy high demands on availability and reliability, the RTACC also provides two combined multi-GNSS product data streams:

SSRA02IGS/SSRC02IGS (GPS, GLONASS, Galileo)
SSRA03IGS/SSRC03IGS (GPS, GLONASS, Galileo, Beidou)

The GPS only SSRA01IGS/ SSRC01IGS combination product has a long history and has been available since the beginning of 2010.

The plots below show the long-term (last 365 days) GPS orbit and clock performance of the combination products against the IGS rapid solution:

In the following, the short-term (last 14 days) satellite orbit and clock performance of different constellations is presented for individual RTAC solutions as well as for the combined products:

1. GPS (left: orbits/ right: clocks)

2. GLONASS (left: orbits/ right: clocks)

3. Galileo (left: orbits/ right: clocks)

Daily comparison reports of clocks from different Analysis Centers are made available for download from BKG GNSS Data Center.

Ionospheric Delay Monitoring

VTEC from global ionospheric maps created in real-time produced by the individual ACs as well as the combination (product stream IONO00IGS1) is compared to a reference ionospheric products based on Jason-3 data. The bias and standard deviation of the ionospheric delay correction products are computed with respect to the reference on a daily basis over the last 30 days and plotted below.

PPP Performance

As a final performance review from the user perspective, the IGS RTS products were introduced in a Precise Point Positioning (PPP) client engine. Corresponding charts resulting from the combination products are presented here.

In addition, the PPP performance resulting from individual RTAC solutions can be found at: https://igs.bkg.bund.de/ntrip/ppp.