Accuracy Analysis of GNSS Hourly Ultra-Rapid Orbit and Clock Products from SHAO AC of iGMAS

With the development of global navigation satellite system(GNSS), hourly ultra-rapid products GNSS are attracting more attention due to their low latency and high accuracy. A new strategy method was applied by Shanghai Astronomical Observatory (SHAO) Analysis Center (AC) international Monitoring Assessment Service (iGMAS) for generating 6-hourly 1-hourly products, which mainly include American Global Positioning System (GPS), Russian Global’naya Navigatsionnaya Sputnikova Sistema (GLONASS), European Union’s Galileo, Chinese BeiDou system (BDS). The orbit clock included a 24-h observation session is determined data from tracking stations, prediction predicted session. accuracy product improved about 1%, 31%, 13%, 11%, 23%, 9% 18%, 43%, 45%, 34%, 53%, 15% GPS, GLONASS, BDS Medium Earth Orbit (MEO), Inclined Geosynchronous (IGSO), GEO orbit, when compared with reference International service (IGS).The precision can also be seen better than products. verify availability reliability used real-time or near-real-time applications, show encouraging prospects.