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3.6.7.2.2.7 Issue of data. The GBAS ground subsystem shall set the IOD field in each ranging source measurement
lock to be the IOD value received from the ranging source that corresponds to the ephemeris data used to compute the
pseudo-range correction.
3.6.7.2.2.8 Application of signal error models. Ionospheric and tropospheric corrections shall not be applied to the
pseudo-ranges used to calculate the pseudo-range corrections.
3.6.7.2.2.9 Linked pair of Type 1 or Type 101 messages. If a linked pair of Type 1 or Type 101 messages is transmitted
then,
a) the two messages shall have the same modified Z-count;
sa
ra ing source shall sequence so that the ephemeris decorrelation parameter, ephemeris CRC and source availability duration
for each core satellite constellation’s ranging source are transmit
data from each satellite until the new ephemeris data have been continuously received for at least 2 minutes but shall make a
transition to the new ephem
u he new CRC ephemeris is transmitted in the low-frequency data of Type 1 or Type 101 message (see Note). If the
ephemeris CRC changes and the IOD does not, the ground subsystem shall consider the ranging source invalid.
Note.— The delay before the ephemeris transition allow sufficient time for the aircraft subsystem to collect new
ephemeris data.
3.6.7.2.2.2.1 Reco
satellite constellation’s ranging source should be broadcast as frequently as possible.
3.6.7.2.2.3 Broadcast pseudo-range correction. Each broadcast pseudo-range correction shall be
com
c
defined in 3.6.7.1.2.2 are satisfied. The
udo-range correction in Type 101 message suc
are satisfied.
Note.— Broadcast of the B parameters are optional for Type
p meters in Type 101 messages is contained in Attachment D, 7.5.11.
Recommendation.—
failed reference receivers should not be used to compute the pseudo-range corrections.
fr e, all broadcasts of Type 1 or Type 101 messages or linked pairs from all GBAS broadcast stations that share a common
GBAS identification, shall have identical data content.
b
23/11/06 APP B-110
Appendix B Annex 10 — Aeronautical Communications
b) the minimum number of pseudo-range corrections in each message shall be one;
c) the measurement block for a given satellite shall not be broadcast more than once in a linked pair of messages; and
d) the two messages shall be broadcast in different time slots.
3.6.7.2.2.10 Modified Z-count update. The modified Z-count for Type 1 or Type 101 messages of a given measurement
me.
3.6.7.2.2.11 Ephemeris decorrelation parameters
3.6.7.2.2.11.1 Category I precision approach and APV. For ground subsystems that broadcast the additional data
block 1 in the Type 2 message, the ground subsystem shall broadcast the ephemeris decorrelation parameter for each core
satellite constellation ranging source such that the ground subsystem integrity risk of 3.6.7.1.2.1.1 is met.
3.6.7.2.2.11.2 GBAS positioning service. For ground subsystems that provide the GBAS positioning service, the
ground subsystem shall broadcast the ephemeris decorrelation parameter for each core satellite constellation’s ranging source
such that the ground subsystem integrity risk of 3.6.7.1.2.1.2 is met.
.6.
3.6.7.2.3.1 Tropospheric delay parameters. The ground subsystem shall broadcast a refractivity index, scale height,
in a Type 2 message such that the protection level integrity risk requirements defined in
3.6.7.2.3.2 GCID indication. If the ground subsystem meets the requirements of 3.6.7.1.2.1.1, 3.6.7.1.2.2.1 and
6.7.1.3.1 the GCID shall be set to 1 otherwise it shall be set to 7.
.7 GBAS reference receiver, the reference
antenna phase centre position error shall be less than 8 cm relative to the GBAS reference point.
3.6.7.2.3.4 Recommendation.— GBAS reference point survey accuracy. The survey error of the GBAS reference point,
lative to WGS-84, should be less than 0.25 m vertical and 1 m horizontal.
Note.— Relevant guidance material is given in Attachment D, 7.16.
nd subsystem shall broadcast an ionospheric delay
radient parameter in the Type 2 message such that the protection level integrity risk requirements defined in 3.6.7.1.2.2 are
tisfied.
3.6.7.2.3.6 For ground subsystems that provide the GBAS positioning service, the ground subsystem shall broadcast
e
3.6.7.2.3.8 For ground subsystems that broadcast additional data block 1 in the Type 2 message, the following
requirements shall apply:
3.6.7.2.3.8.1 Maximum use distance. The e the distance (Dmax) from the GBAS reference
oint that defines a volume within which the gr in 3.6.7.1.2.1 and the protection level integrity
sk
type shall advance every fra
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