Improving GNSS PPP-RTK through global forecast system zenith wet delay augmentation

• DOI: 10.1007/s10291-023-01608-0
• Publication Date: 2024-01-27T05:01:56Z
• Authors: Rui Gao; Zhizhao Liu; Robert Odolinski; Baocheng Zhang
• Keywords: Zenith; Precise Point Positioning

Abstract The precise point positioning real-time kinematic (PPP-RTK) is a high-precision global navigation satellite system (GNSS) technique that combines the advantages of wide-area coverage in (PPP) and rapid convergence (RTK). However, PPP-RTK still limited by precision slant ionospheric delays tropospheric zenith wet delay (ZWD), which affects network parameters estimation user performance. present study aims to construct model augmented with priori ZWD values derived from forecast (GFS) product (a numerical weather prediction (NWP) model) improve This gives conversion based on GFS products, full-rank GFS-augmented undifferenced uncombined (UDUC) derived. To verify performance UDUC PPP-RTK, comprehensive evaluation using 10-day GNSS observation data three different station networks United States (US), Australia, Europe conducted. results show information, significantly improves at initial filtering stage, but this advantage gradually decays over time. Based for all stations, ZWD-augmented approach reduces average time 46% 10.0 5.4 min, three-dimensional root-mean-square (3D-RMS) error 5.7% 3.5 3.3 cm, first fix (TTFF) value 35.8% 6.7 4.3 when compared traditional without constraints.