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civil authorities. States are responsible for providing the FAS data for incorporation into the database. The FAS block for a
particular approach procedure is described in Appendix B, 3.6.4.5.1 and Table B-66.
Table D-1. SBAS FAS data block
Data content Bits used Range of values Resolution
Operation type 4 0 to 15 1
SBAS provider ID 4 0 to 15 1
Airport ID 32 – –
Runway number (Note 1) 6 0 to 36 1
Runway letter 2 – –
Approach performance designator 3 0 to 7 1
Route indicator 5 – –
Reference path data selector 8 0 to 48 1
Reference path identifier 32 – –
LTP/FTP latitude 32 ± 90.0° 0.0005 arcsec
LTP/FTP longitude 32 ± 180.0° 0.0005 arcsec
LTP/FTP height 16 –512.0 to 6 041.5 m 0.1 m
ΔFPAP latitude 24 ± 1.0° 0.0005 arcsec
ΔFPAP longitude 24 ± 1.0° 0.0005 arcsec
Approach threshold crossing height
(TCH) (Note 2)
15 0 to 1 638.35 m
(0 to 3 276.7 ft)
0.05 m
(0.1 ft)
Approach TCH units selector 1 – –
Glide path angle (GPA) 16 0 to 90.0° 0.01°
Course width at threshold (Note 1) 8 80.0 to 143.75 m 0.25 m
ΔLength offset 8 0 to 2 032 m 8 m
Horizontal alert limit (HAL) 8 0 to 50.8 m 0.2 m
Vertical alert limit (VAL) (Note 3) 8 0 to 50.8 m 0.2 m
Final approach segment CRC 32 – –
Note 1.— When the runway number is set to 00, then the course width field is ignored and the course width is 38 m.
Note 2.— Information can be provided in either feet or metres as indicated by the approach TCH unit sector.
Note 3.— VAL of 0 indicates that the vertical deviations are not to be used (i.e. a lateral guidance only approach).
ATT D-15 23/11/06
Annex 10 — Aeronautical Communications Volume I
7. Ground-based augmentation system (GBAS)
and ground-based regional augmentation system (GRAS)
Note.— In this section, except where specifically annotated, reference to approach with vertical guidance (APV) means
APV-I and APV-II.
7.1 System description
7.1.1 GBAS consists of ground and aircraft elements. A GBAS ground subsystem typically includes a single active
VDB transmitter and broadcast antenna, referred to as a broadcast station, and multiple reference receivers. A GBAS ground
subsystem may include multiple VDB transmitters and antennas that share a single common GBAS identification (GBAS ID)
and frequency as well as broadcast identical data. The GBAS ground subsystem can support all the aircraft subsystems within
its coverage providing the aircraft with approach data, corrections and integrity information for GNSS satellites in view. All
international aircraft supporting APV should maintain approach data within a database on board the aircraft. The Type 4
message must be broadcast when the ground subsystem supports Category I precision approaches. The Type 4 message must
also be broadcast when the ground subsystem supports APV approaches if the approach data is not required by the State to be
maintained in the on-board database.
Note.— Allocation of performance requirements between the GBAS subsystems and allocation methodology can be
found in RTCA/DO-245, Minimum Aviation System Performance Standards for the Global Positioning System/Local Area
Augmentation System (GPS/LAAS). Minimum Operational Performance Standards for GRAS airborne equipment are under
development by RTCA.
7.1.2 GBAS ground subsystems provide two services: the approach service and the GBAS positioning service. The
approach service provides deviation guidance for FASs in Category I precision approach, APV, and NPA within the
operational coverage area. The GBAS positioning service provides horizontal position information to support RNAV
operations within the service area. The two services are also distinguished by different performance requirements associated
with the particular operations supported (see Table 3.7.2.4-1) including different integrity requirements as discussed in 7.5.1.
7.1.3 A primary distinguishing feature for GBAS ground subsystem configurations is whether additional ephemeris
error position bound parameters are broadcast. This feature is required for the positioning service, but is optional for
approach services. If the additional ephemeris error position bound parameters are not broadcast, the ground subsystem is
responsible for assuring the integrity of ranging source ephemeris data without reliance on the aircraft calculating and
applying the ephemeris bound as discussed in 7.5.9.
7.1.4 GBAS. There are multiple configurations possible of GBAS ground subsystems conforming to the GNSS
Standards, such as:
a) configuration that supports Category I precision approach only;
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