Sub-meter-level navigation with an enhanced multi-GNSS single-point positioning algorithm using iGMAS ultra-rapid products

Abstract

Ultra-rapid products have the advantage of being used in real-time positioning with no external connections. In this study, these products provided by the international GNSS Monitoring and Assessment System (iGMAS) for four global constellations (GPS, GLONASS, Galileo and BDS-3) were assessed in terms of service rate and accuracy in navigation. In this regard, a MATLAB-based in-house code solving the problem was developed for all possible combinations of the constellations. To explore the effectiveness of the iGMAS products, the same dataset has been also processed using GFZ rapid products. The results demonstrate that the GPS and Galileo solutions were substantially comparable to the rapid products concerning service rate and accuracy, but that the GLONASS and BDS-3 iGMAS products require some enhancements. In addition, the Galileo solution produced remarkably good results both individually and in combination. The GPS/GLONASS/Galileo/BDS-3 SPP solution generated a mean root mean square (RMS) error of 0 ⋅ 54 m horizontally and 0 ⋅ 89 m vertically. Thus, GPS-only, GLONASS-only, Galileo-only and BDS-3-only solutions were improved by 42%, 79%, 28% and 74% in 3D mean RMS error with the quad system solutions, respectively.

Düşük Maliyetli GNSS Alıcılarının Çoklu-GNSS PPP Performanslarının Farklı Anten Tipleri ve Ağırlık Modellerine Göre Araştırılması

“…Bu aşamada, global GNSS ağlarından üretilen hassas yörünge ve saat ürünleri kullanılır. İlk zamanlarda bu ürünler IGS (International GNSS Service) tarafından kullanıcılara sunulsa da, günümüzde pek çok Analiz Merkezi bu ürünleri ücretsiz olarak yayınlamaktadır (Birinci and Saka 2023). Hem bu ürünlerin hem de PPP üzerine yapılan çalışmaların daha da artması ve GLONASS, Galileo ve BDS gibi uydu takımlarına ait yeni uyduların da fırlatılması, PPP'yi daha ilgi çekici hale getirmiştir.…”