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in grity is assured.
APP B-87 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 APP B-88
Note.— This parameter does not indicate a distance within which VHF data broadcast field strength requirements are met.
Coding: 0 = No distance limitation
GPS EPHEMERIS MISSED DETECTION PARAMETER, GBAS Positioning Service (Kmd_e_POS,GPS): the multiplier for
computation of the ephemeris error position bound for the GBAS positioning service derived from the probability of missed
detection given that there is an ephemeris error in a GPS satellite.
For GBAS ground subsystems that do not broadcast corrections for GPS ranging sources or that do not provide the GBAS
positioning service, this parameter shall be coded as all zeros.
GPS EPHEMERIS MISSED DETECTION PARAMETER, Category I Precision Approach and APV (Kmd_e,GPS): the multiplier
for computation of the ephemeris error position bound for Category I precision approach and APV derived from the
probability of missed detection given that there is an ephemeris error in a GPS satellite.
For GBAS ground subsystems that do not broadcast corrections for GPS ranging sources, this parameter shall be coded as all
zeros.
GLONASS EPHEMERIS MISSED DETECTION PARAMETER, GBAS Positioning Service (Kmd_e_POS,GLONASS): the multiplier
for computation of the ephemeris error position bound for the GBAS positioning service derived from the probability of
missed detection given that there is an ephemeris error in a GLONASS satellite.
For GBAS ground subsystems that do not broadcast corrections for GLONASS ranging sources or that do not provide
positioning service, this parameter shall be coded as all zeros.
GLONASS EPHEMERIS MISSED DETECTION PARAMETER, Category I Precision Approach and APV (Kmd_e,GLONASS): the
multiplier for computation of the ephemeris error position bound for Category I precision approach and APV derived from
the probability of missed detection given that there is an ephemeris error in a GLONASS satellite.
For GBAS ground subsystems that do not broadcast corrections for GLONASS ranging sources, this parameter shall be
coded as all zeros.
3.6.4.3.2 Additional data blocks. For additional data blocks other than additional data block 1, the parameters for each
data block shall be as follows:
ADDITIONAL DATA BLOCK LENGTH: the number of bytes in the additional data block, including the additional data block
length and additional data block number fields.
ADDITIONAL DATA BLOCK NUMBER: the numerical identifier of the type of additional data block.
Coding: 0 to 1 = reserved
2 = additional data block 2, GRAS broadcast stations
3 to 255 = spare
ADDITIONAL DATA PARAMETERS: the set of data defined in accordance with the additional data block number.
3.6.4.3.2.1 GRAS broadcast stations
Parameters for additional data block 2 shall include data for one or more broadcast stations as follows:
CHANNEL NUMBER: the channel number, as defined in 3.6.5.7, associated with a GBAS broadcast station.
Note.— The channel number in this field refers to a frequency and an RSDS.
Appendix B Annex 10 — Aeronautical Communications
ΔLATITUDE: the difference of latitude of a GBAS b cast statio from the lati ovided in the latitude
parameter of T
Coding: Pos AS broadc n is north he GBAS reference t.
Negative value denotes that the GBAS broadcast station is south of the GBAS reference point.
ΔLONGITUD ference of longitude of a GBAS broadcast station, measured from the longitude provided in the
longitude para ete
oding: Positive value denotes that the GBAS broadcast station is east of the GBAS reference point.
Negative value denotes that the GBAS broadcast station is west of the GBAS reference point.
nging sources and is
Type ment (FAS). Type 4 message shall contain one or more sets of FAS data,
ach defin sion approach (Table B-72). Each Type 4 message data set shall include the following:
h field and the associated FAS
data block, FAS vertical alert limit (FASVAL)/approach status and FAS lateral alert limit (FASLAL)/approach status
AS data APV and define its associated approach path.
od
Note.— Guidance material for FAS path definition is contained in Attachment D, 7.11.
FASVAL/approach status: the value of the parameter FASVAL as used in 3.6.5.6.
oding: 1111 1111 = Do not use vertical deviations.
r FASVAL depend upon the approach performance designator in the
ssociated FAS data block.
ASLAL/ f the parameter FASLAL as used in 3.6.5.6.
Table B-65A. GRAS broadcast station data
ontent Bits used Range of values Resolution
road n, measured tude pr
ype 2 message.
itive value denotes that the GB ast statio of t poin
E: the dif
 
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