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GEO_lsb: the maximum round-off error due to the resolution of the orbit and clock information.
GEO_v: the velocity error bound on the maximum range rate difference of missed messages due to clock and orbit rate
differences.
IGEO: the update interval for GEO ran
Table B-34. Fast correction degradation factor
Fast correction degradation
factor indicator (aii)
Fast c ation
F i i
as described in Table B-34.
i
B
3.5.5.6.2.2.
Cltc_lsb: the maximum round-off error due to the resolution of the orbit and clock inf
Cltc_v1: the velocity error bound on the maximum range rate difference of missed messages due to clock and orbit rate differences.
Iltc_v1
C
code = 0.
Iltc_v0: the minimum update interval for long-term messages if velocity code = 0 (3.5.4.4.1).
C
C
ging function messages.
orrection degrad
factor (ai)
0 0.0 mm/s2
1 0.05 mm/s2
2 0.09 mm/s2
3 0.12 mm/s2
4 0.15 mm/s2
5 0.20 mm/s2
6 0.30 mm/s2
7 0.45 mm/s2
8 0.60 mm/s2
9 0.90 mm/s2
10 1.50 mm/s2
11 2.10 mm/s2
12 2.70 mm/s
13 3.30 mm/s
2
2
14 4.60 mm/s2
15 5.80 mm/s2
APP B-45 23/11/06
Annex 10 — Aeronautical Communications Volume I
Cer: the bound on the residual error associated with using data beyond the precision approach/approach with vertical guidance
ospheric grid delay values.
.
SSUDRE: the root-sum-square flag for fast and long-term correction residuals.
oding: 0 = correction residuals are linearly summed
SSiono: the root-sum-square flag for ionospheric residuals.
oding: 0 = correction residuals are linearly summed
covariance: the term which is used to compensate for quantization effects when using the Type 28 message.
Note 1.— The parameters a and t are broadcast in Type 7 message. All other parameters are broadcast in Type 10
es
TC standard identifier: an indication of the UTC reference source as defined in Table B-35.
PS time-of-week count: the number of seconds that have passed since the transition from the previous GPS week (similar to
the GPS parameter in 3.1.1.2.6.1 but with a 1-second resolution).
Table B-35. UTC standard dentifier
UTC standard
identifier UTC standard
time-out.
Ciono_step: the bound on the difference between successive ion
Iiono: the minimum update interval for ionospheric correction messages.
Ciono ramp: the rate of change of the ionospheric corrections
R
C
1 = correction residuals are root-sum-squared
R
C
1 = correction residuals are root-sum-squared
C
i lat
m sage.
Note 2.— If message Type 28 is not broadcast, Ccovariance is not applicable.
3.5.4.8 Time parameters. Time parameters, whenever used, shall be as follows:
U
G
i
0 munications Research
operated by the International Bureau of Weights
rved for UTC as operated by a European laboratory
5 to 6 Spare
UTC as operated by the Com
Laboratory, Tokyo, Japan
1 UTC as operated by the U.S. National Institute of
Standards and Technology
2 UTC as operated by the U.S. Naval Observatory
3 UTC as
and Measures
4 Rese
7 UTC not provided
23/11/06 APP B-46
Appendix B Annex 10 — Aeronautical Communications
GPS week number (week count): see 3.1.1.2.6.2.
GLONASS indicator: a flag indicating if GLONASS time parameters are provided.
Cod e parameters are not provided
1 = GLONASS time parameters are provided
LONASS time offset (δai,GLONASS): A parameter that represents the stable part of the offset between the GLONASS time and
Note.— If SBAS does not support GLONASS, δa is not applicable.
TC parameters: A , A , t , WN , Δt , WN , DN and Δt are as described in 3.1.1.3.3.6, with the exception that
sue of data, service (IODS): an indication of a change of the service provided in the region.
Num ages being broadcast. (Value is coded with
an offset of 1.)
ervice message number: a sequential number identifying the message within the currently broadcast set of Type 27
umber of regions: the number of service regions for which coordinates are broadcast in the message.
Prio es define overlapping regions. The message with a higher
value of priority code takes precedence. If priority codes are equal, the message with the lower δUDRE takes precedence.
δUD RE) applicable at locations inside any
region defined in the message, in accordance with Table B-36.
UDRE indicator-outside: an indication of regional UDRE degradation factor (δUDRE) applicable at locations outside all
nce with Table B-36.
longitude of one corner of a region.
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