Danan Dong

TL;DR: A new GNSS analysis software called GAMP (GNSS Analysis software for Multi-constellation and multi-frequency Precise positioning), which can perform multi-GNSS precise point positioning based on undifferenced and uncombined observations is developed.

TL;DR: This work focuses on the spatial–temporal repeatability-based MHM and SF/ASF approaches and compares their performances for multipath reduction, finding that the MHM model is easier to implement for real-time multipath mitigation when the overall multipath regime is medium to low frequency.

TL;DR: Generally, the positioning performance of PPP in terms of convergence time and positioning accuracy with the final products from CODE, CNES, and WHU is comparable among the three ISB handling schemes, however, estimating ISBs as random walk process or white noise process outperforms that as the random constant when using the GFZ products.

TL;DR: Overall, the scheme of estimating IFBs for each GLonASS satellite outperforms the other schemes in both convergence time reduction and positioning accuracy improvement, which indicates that the GLONASS IFBs may not strictly obey a linear or quadratic function relationship with the frequency number.

TL;DR: A simplified and unified model for multi-GNSS PPP is developed, where ISB parameter does not need to be estimated and observations from different GNSS systems are treated in a unified way.