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CORS system (Continuous Operational Reference System) is one of the development hotspots of modern GPS, which introduces the concept of network into the application of geodesy. The establishment of this system not only brings huge changes to the surveying and mapping industry, but also brings new ideas and modes to the spatial information service in the modern network society.

Static survey is the most basic survey method of GNSS receivers, which can achieve millimeter-level accuracy after post-processing. Surveyors should be very familiar with the RINEX data format, as it is the most common and standard raw data format for static surveys.

When it comes to satellite navigation systems, the first thing that comes to mind are the 4 GNSS (Global Navigation Satellite System) that are well known to end users and are generally supported by GNSS products on the market, including GPS of the United States, GLONASS of Russia, BDS of China and Galileo of Europe.

When asked for the time, you can read it from your PC, smartphone, watch or wall clock, which is what we use every day - your local time. Have you ever wondered how this time is defined?

When using navigation and positioning products, we often judge the working state of the device through some state parameters. Have you ever seen the DOP indicators in the status bar such as VDOP, PDOP and HDOP? The HDOP value is also included in #GPGGA message to judge the horizontal positioning accuracy.

In the last blog, we've learned how GNSS works and what it consists of. So after obtaining the satellite signal, what can we do with it? Or in other words, what services can GNSS provide?