What is the difference between the ESTB and EGNOS architecture?

ESTB (EGNOS System Test Bed) is a reduced version of EGNOS that uses dedicated monitoring stations and processing devices. Since February 2000, ESTB has been offering an experimental signal to help navigation equipment manufacturers and application developers test their products. The experimental signal also allows users to become familiar with EGNOS and allows tests to be conducted so EGNOS can expand its services outside of Europe.

EGNOS and ESTB are two independent systems making use of their own ground segment infrastructure and different geostationary satellites. EGNOS and ESTB also broadcast two different signals. The ESTB signal cannot and does not provide the availability and integrity that EGNOS provides. Therefore, it cannot be used in any safety critical applications.