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Coding: 1111 1111 = Ranging source correction invalid.
1 throug ted with the pseudo-range corrections provided in the same measurement
block. s correspond to Bi,1 through Bi,4 (3.6.5.5.1.2, 3.6.5.5.2.2 and 3.6.7.2.2.4).
.
ce point
GBA stalled in this GBAS ground subsystem.
Coding: 0 = GBAS installed with 2 reference receivers
S reference receivers installed in this GBAS ground subsystem is not applicable
Ground accuracy designator letter: the letter designator indicating the minimum signal-in-space accuracy performance
provided by GBAS (3.6.7.1.1).
oding: 0 = accuracy designation A
3
GBAS continuity/integrity designator (GCID): numeric designator indicating the operational status of the GBAS.
oding: 0 = spare
1 = GCID 1
2 = GCID 2
3 = GCID 3
4 = GCID 4
5 = spare
6 = spare
7 = unhealthy
P
R
σ : th standard deviation of a normal distrib
the GBAS reference point (3.6.5.5.1, 3.
B h B4: are the integrity parameters associa
For the ith ranging source these parameter
Coding: 1000 0000 = Reference receiver was not used to compute the pseudo-range correction
3.6.4.3 Type 2 message — GBAS-related data. Type 2 message shall identify the location of the GBAS referen
at which the corrections provided by the GBAS apply and shall give other GBAS-related data (Table B-71). GBAS-related
data parameters shall be as follows:
Note.— Additional data blocks may be included in the Type 2 message. Additional data block 1 and additional data
block 2 are defined. In the future, other additional data blocks may be defined. Data blocks 2 through 255 are variable length
and may be appended to the message after additional data block 1 in any order.
S reference receivers: the number of GNSS reference receivers in
1 = GBAS installed with 3 reference receivers
2 = GBAS installed with 4 reference receivers
3 = The number of GNS
C
1 = accuracy designation B
2 = accuracy designation C
= spare
C
23/11/06 APP B-86
Appendix B Annex 10 — Aeronautical Communications
Note 1.— The values of GCID 2, 3 and 4 are specified in order to ensure compatibility of equipment with future GBAS.
pproach or APV cannot be initiated.
Local magnetic variation: the published magnetic variation at the GBAS reference point.
ding: Positive value denotes east variation (clockwise from true north), Negative value denotes west variation (countercorrection
associated
eld of +400. A value of zero in this field indicates a
refractivity index of 400.
associated
efractivity uncertainty (σn): the standard deviation of a normal distribution associated with the residual tropospheric
uncertainty (3.6.5.3).
Latitude: the latitude of the GBAS reference point defined in arc seconds.
od
Negative value denotes south latitude.
ongitude: the longitude of the GBAS reference point defined in arc seconds.
oding:
Negative value denotes west longitude.
BAS reference point above the WGS-84 ellipsoid.
3.6.4.3.1 Additional data block 1 parameters. Additional data block 1 parameters shall be as follows:
REFERENCE STATION DATA SELECTOR (RSDS): the numerical identifier that is used to select the GBAS ground
subsystem.
Note.— The RSDS is different from every other RSDS and every reference path data selector (RPDS) broadcast on the
BAS ground subsystem within the broadcast region.
od
MAXIMUM USE DISTANCE (Dmax): the maximum distance (slant range) from the GBAS reference point for which the
te
Note 2.— The value of GCID 7 indicates that a precision a
Co
clockwise from true north)
100 0000 0000 = Precision approach procedures supported by this GBAS are published based on true bearing.
Note.— Local magnetic variation is chosen to be consistent with procedure design and is updated during magnetic
epoch years.
σvert_iono_gradient: the standard deviation of a normal distribution associated with the residual ionospheric uncertainty due to
spatial decorrelation (3.6.5.4).
Refractivity index (Nr): the nominal tropospheric refractivity index used to calibrate the tropospheric
with the GBAS ground subsystem (3.6.5.3).
Coding: This fi is coded as two’s complement number with an offset
Scale height (ho): a scale factor used to calibrate the tropospheric correction and residual tropospheric uncertainty
with the GBAS ground subsystem (3.6.5.3).
R
C ing: Positive value denotes north latitude.
L
C Positive value denotes east longitude.
Reference point height: the height of the G
same frequency by every G
C ing: 1111 1111 = GBAS positioning service is not provided
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