Seres Reference Manual
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away from the equator and the satellite’s longitude will cause the satellite to
appear lower on the horizon. If the EGNOS signal becomes unavailable
due to obstruction, COAST technology helps to maintain system
performance during times of differential outage.
When using SBAS correction data, the Seres is able to provide you with
the azimuth and elevation of the SBAS available satellites via a NMEA serial
port command to aid in determining their position with respect to the
built-in antenna. More about this feature is described in Section 5.5.2.
1.5.4
WAAS and ESTB Coverage
Figure 1-3 depicts the current WAAS coverage as provided by the
currently leased Inmarsat Atlantic Ocean Region - West (AOR-W) and
Pacific Ocean Region (POR) geostationary satellites. This figure
approximates signal coverage with white shading where each satellite is 5
°
elevation or greater. Figure 1-3 also shows additional contours for 10
°
,
15
°
, and 20
°
elevations. Within the white shaded coverage area, at least
one of the two satellites is available by line of sight. Within the overlap
area, both satellites may be accessible. Although there is geographic
coverage at higher latitudes, practical usage of WAAS will be limited to
environments where a relatively consistent line of sight to either of the
Inmarsat satellites from the Seres system.
Figure 1-4 presents approximate EGNOS System Test Bed coverage
provided by the leased Inmarsat Atlantic Ocean Region - East (AOR-E) and
Indian Ocean Region (IOR) satellites. This figure approximates signal
coverage with white shading where each satellite is 5
°
elevation or greater.
Figure 1-3 also shows additional contours for 10
°
, 15
°
, and 20
°
elevations.
Within the white shaded coverage area, at least one of the two satellites is
available by line of sight. Within the overlap area, both satellites may be
accessible. Virtually all of Europe, part of northern Africa, and into the
Middle East is covered with at least one signal. Most of Europe is covered
by two signals.
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