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54 SMART-MR10/15 User Manual Rev 5
Chapter 3 Operation
EGNOS (European Geostationary Navigation Overlay Service)
EGNOS has been developed to work with existing satellite navigation systems to improve the
accuracy of navigation signals. The EGNOS signal is transmitted by two geostationary satellites and
covers all of Europe. EGNOS transmits a signal containing information on the reliability and accuracy
of the positioning signals sent out by GPS.
At the time of this writing, the signal broadcast by the EGNOS satellites AOR-E (PRN120) and the
ESA ARTEMIS satellite (PRN 124) is used for EGNOS Operations. The EGNOS satellite IOR-W
(PRN 126) is currently used by Industry to perform various tests on the system.
More information on EGNOS can be found at www.esa.int/egnos
.
3.4 GL1DE®
SMART-MR10/15 contain NovAtel’s GL1DE, a positioning algorithm for single frequency GPS and
GPS/GLONASS applications. GL1DE produces a smooth position output tuned for applications
where optimal time relative (pass-to-pass) accuracy is more important than absolute accuracy, making
it well suited for agricultural applications.
Multipath signals tend to induce time-varying biases and increase the measurement noise on the L1
pseudorange measurements. Carrier phase measurements are much less susceptible to the effects of
multipath. The GL1DE algorithm combines the information from the L1 code and the L1 phase
measurements into a Position-Time-Velocity (PVT) solution.
GL1DE includes settings for a dynamic mode, a static mode, and an “auto” mode, where the filtering
parameters are automatically adjusted as vehicle velocity varies between stationary and dynamic
states.
Refer to the NovAtel white papers on the NovAtel website at www.novatel.com/support/knowledge-
and-learning/published-papers-and-documents/white-papers/ for more information on GL1DE. Refer
also to the application note “APN-038 Pseudorange/Delta-Phase (PDP) and GL1DE Filters” on the
NovAtel website at www.novatel.com/support/knowledge-and-learning/published-papers-and-
documents/application-notes/.
3.5 ALIGN®
3.5.1 ALIGN
Heading Master and Remote Configurations
For information about how to set up a master station with an ALIGN-capable remote receiver for
applications that require relative heading and pitch output, refer to APN-048. This Application Note is
available from the NovAtel website at www.novatel.com/support/knowledge-and-learning/published-
papers-and-documents/application-notes/.