What is OSR (Observation Space Representation)?
OSR (Observation Space Representation), is a method of delivering GNSS corrections. In OSR, all relevant GNSS errors; such as those due to atmospheric conditions, satellite clock errors, and orbital inaccuracies; are combined into a single correction value per satellite and signal. These corrections are typically derived from observations made by a nearby reference station and are provided directly to the rover.
OSR is most commonly used in RTK systems and is delivered using standard formats like RTCM via protocols such as NTRIP. The rover applies these corrections directly to its own observations to compute an accurate position solution. OSR is distinct from SSR (State Space Representation), which models each error source separately and requires the receiver to compute its own corrections.
In summary, OSR simplifies the correction process for the receiver by providing ready-to-use corrections per satellite, making it ideal for real-time, high-precision applications where low latency and ease of integration are critical.
