you very much for contacting the ESTB Helpsdek E-mail . Please
note the following information .
you probably know, today we are transmitting a pre-operational
EGNOS signal through the EGNOS test bed (ESTB). This signal is
a test signal so it is not a guaranteed service signal. In reality,
however, the performance of this test bed is quite good achieving
accuracies of the order of 1-2m in core of Europe. You can verify
the cover area on the web page :
in the attached document showing EGNOS service area ( ECAC area
Both EGNOS and WAAS systems are designed against the same International
ICAO standards and RTCA MOPS. When operational, both WAAS and
EGNOS receivers will be interoperable, and, therefore, a receiver
able to process WAAS will also process EGNOS and vice versa.
however, EGNOS test bed (EGNOS mock up, the ESTB) and WAAS systems
are currently under testing and as such are forced to transmit
the message type 0. There are certain basic differences in the
way message type 0 (again a mandatory message while testing) is
generated in EGNOS or WAAS, which have resulted in a number of
manufacturers not implementing both solutions, which are, according
to RTCA MOPS DO 229C, possible (see note below).
introduces some differences in receivers behaviour and performance. When the systems become operational for safety of life, message
type 0 is not sent anymore and this difference will disappear.
Operational readiness review is today planned to take place in
April 2004. After this date, EGNOS will conform to EGNOS specifications
and will start nominal operations. ESA and the European Commission
are currently discussing the potential future operator so
that early introduction of the EGNOS service is efficiently performed.
further information please do not hesitate to contact the ESTB