Delivering mass market high precision positioning using correction services
There are two approaches when it comes to delivering GNSS correction services. The first is observation space representation (OSR). Here, the service calculates the expected error at the location of each specific rover, and sends this directly to the rover device.
The other technique is called state space representation (SSR). Here, GNSS signal errors are monitored and then used to physically model errors spanning a full region, in a so-called ‘state space’ model. The data describing the model at a given point in time is transmitted to rovers right across the coverage area.
Only SSR can feasibly be scaled up to become a truly mass market solution. Here’s why.
Applicable in situations needing centimeter- or millimeter-level accuracy, OSR is used in real time kinematic (RTK) and network RTK satellite navigation. OSR-based systems need a two-way link between the rover and correction data service provider. Moreover, for optimal accuracy, the rover must remain within 30 km of the base station. The challenge with OSR is that if it were to be adopted by the mass market, current mobile communication networks would struggle to reliably deliver the levels of communication required. Consequently, OSR isn’t ideally suited to mass adoption.