Introduction to Survey of India CORS

Survey of India has established a network of Continuously Operating Reference Stations (CORS), which not only capable of providing Real Time Positioning Service through RTK/NRTK with an accuracy of + / - 3cm, but also host an array of different positioning services targeted to cater requirements for different segments of Geospatial and scientific Community. These networked CORS stations (or GNSS receivers) are permanent installations and continuously stream satellite observations to a central server. The entire setup of Reference Stations and Central Server is known as Continuous Operating Reference Station (CORS) Network. The central server running specialized software performs calculations to further refine the rover position by sending Network Real-Time Kinematic (NRTK) corrections to the rover. The distance between a GNSS rover and the corresponding base station is no longer an issue. Users can subscribe to CORS network on monthly or yearly basis to receive NRTK corrections with their rover instead of having to set up their own base station. The CORS network is available 24 hours per day, 7 days a week and 365 days a year. However, it depends on the communication Service Provider and satellite availability. Data streaming of RTCM 2.4, RTCM 3.2 is supported in real-time and users can also retrieve stored GNSS data from the central server via the internet for post-processing. Users can also submit static survey GNSS data for online processing.