Performance of real-time Precise Point Positioning using IGS real-time service

Abstract

Until recently, the real-time IGS precise orbit and clock corrections were only available for the predicted part of the ultra-rapid solution. Whereas the accuracy of the ultra-rapid orbit is about 5 cm, the root mean square (RMS) of the respective satellite clock corrections is, unfortunately, about 3 ns (0.9 m). Hence, high accuracy Precise Point Positioning (PPP) applications can be achieved only in post-processing rather than in realtime. With the availability of the IGS real-time service (RTS), it becomes possible to obtain precise satellite orbit and satellite clock corrections in realtime with accuracy better than those of the ultra-rapid products. Recent research has shown that GPS IGS RTS products availability is at least 95 %, which makes it possible to perform real-time PPP with high accuracy. We study the performance of IGS RTS products in PPP by introducing a detailed description and analysis of IGS RTS products, describing the broadcasting of the IGS RTS orbit and clock corrections and their implementation as corrections to the broadcast ephemerides, and analyzing IGS RTS in PPP using several, randomly selected globally distributed IGS stations. It is shown that using IGS RTS products in real-time PPP can improve the solution RMS by about 50 % compared with the solution obtained from the predicted part of the IGS ultra-rapid products.

Validation and Assessment of Multi-GNSS Real-Time Precise Point Positioning in Simulated Kinematic Mode Using IGS Real-Time Service

“…The RTCM-SSR real-time satellite orbit corrections, which are the corrections referred to the satellite broadcasted ephemerides, are defined in the RAC (radial, along-track, and cross-track) orbital coordinate system, but the broadcast ephemeris is referred to the Earth-Centered-Earth Fixed (ECEF) coordinate system; the real-time orbit corrections should be therefore transformed from the RAC coordinate system to the ECEF coordinate system [15,22].…”

Real-Time Tropospheric Delays Retrieved from Multi-GNSS Observations and IGS Real-Time Product Streams

“…Additionally, the products can be accessed through internet without special licensing [26]. The accuracies for the orbits and clocks are 5 cm and 0.3 ns, respectively [27]. As an example, GFZ, as one of the IGS-RT data analysis centers, is able to offer the RT satellite orbit/clock products of all four systems to users with accuracy at cm level [14].…”

Precise Point Positioning Technique with IGS Real-Time Service (RTS) for Maritime Applications

“…With the advancement in GPS positioning techniques such as PPP positioning and with the advent of new real-time GNSS correction services such as IGS-RTS service, it is necessary to assess the possibility of a wider role of the PPP-based positioning technique along with IGS-RTS service and their capability to enable new maritime applications. The PPP-based positioning solution using real-time IGS-RTS service is still under investigation by many researchers to examine and analyze its accuracy and solution performance in static and kinematic mode [8] [9]. However, it is essential to examine the positioning solution performance of real-time PPP-based IGS-RTS technique for all potential applications that require an accurate positioning such as maritime navigation applications in ports.…”