GNSS CORS networks principles
Schwieger, Volker
GNSS is an abbreviation for Global Navigation Satellite System (GNSS). The most known GNSS is the Global Positioning System (GPS) developed and operated by the USA Departments of Defence and Transportation. Competing and complementary systems are GLONASS and in the future, among others, the European Galileo and the Chinese Compass. For all GNSS measurements of geodetic accuracy you will need at least two simultaneously measuring receivers. In general, the one on a site with known co-ordinates is called the referencee station. The one located on the site with unknown co-ordinates is called the roverr. The development of GNSS, especially of GPS, has lead to the operation of continuous operating reference stations (CORS) that acquire GPS signals without any interruption. Additionally these CORS have the task to store the data and in some circumstances process the data and then transmit this data to rover receivers. These CORS help the users by economizing one GPS receiver as the operation of the reference station is performed by the service provider of the CORS network. In general a service provider owns or operates a network of CORS that is capable of estimating or resolving the ambiguitiess of all CORS as one homogeneous model in real time. This is often referred to as a network solutionn within a GNSS CORS network.
Event: 6th FIG Regional Conference 2007 : Strategic Integration of Surveying Services
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