TERRASTAR-M is a global GNSS augmentation service designed for users who need reliable, accurate position with a high level of integrity. Based on L1 carrier and C/A code observations, TERRASTAR-M provides metre-level position accuracy by calculating pseudo-range corrections using a single difference technique for both GPS and GLONASS satellites. Correction data is delivered seamlessly by both high and low power satellite broadcasts, worldwide.
At the heart of the system is the network of reference stations and control centres, which is the source of the GNSS correction data. To ensure consistent global performance, the latest techniques are used to make certain that station antennas are coordinated to an absolute accuracy at the centimetre level. Reference stations are located to ensure optimum coverage and redundancy for land users everywhere. TERRASTAR-M can be used with a range of compatible GNSS receivers. Augmentation data is produced at two, fully redundant Network Control Centres (NCCs), both capable of managing 100% system operation. The main NCC is manned around the clock and also hosts the global Helpdesk, which monitors service availability and performance, and provides clients with support and information at any time.