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IODP
For two satellites
2 0 to 3 1
2,2
1,2 10 ±512 1
E1,3 10 ±512 1
E1,4 10 ±512 1
E2,3 10 ±512 1
E 10 ±512 1
Notes.—
1. The parameters PRN mask number and IODP are defined in 3.5.4.1.
2. All other parameters are defined in 3.5.4.10.
PRN mask number 6 0 to 51 1
Scale exponent 3 0 to 7 1
E1,1 9 0 to 511 1
E 9 0 to 511 1
E3,3 9 0 to 511 1
E4,4 9 0 to 511 1
E
2,4
E3,4 10 ±512 1
3.5.7 NON-AIRCRAFT ELEMENTS
Note 1.— Depending on the level of service offered by a particular SBAS, different functions can be implemented as
described in Chapter 3, 3.7.3
Note 2.— The parameters that are re n this section are defi 5.4.
3.
data and broadcast i . SBAS shall broadcast the data requ ed for the su orted func s as
s e B-54. If the SBAS broadc ta that are ot required particular function, the uiremen
d her functions shall apply. T aximum in rval betwee dcasts fo l data of ea ata ty
s e B-54.
frequency m ng. The all mo itor the SBAS satellite p n in
T ted action.
oadcast null mess ype 63 me ages) in each ime slot for w ich no other ta are bro t.
“Do Not Use”. SBAS shal ast a “Do t Use” me (Type 0 ) when cessary to rm
users not to use the SBAS satellite ranging function and data.
nac data. SBAS shal cast alman ata for SBAS satellites in 3.5 .3) with e less
th NM) of the true satellite po Unused almanac slots in Type 17 me es shall be coded with N
code number of “0”. The health and status shall indicate satellite status and the service provider as defined in 3.5.4.3.
broadcast almanac data for all SBAS satellites, regardless of the service
pro
.4.2.
ferred to i ned in 3.
5.7.1 GENERAL
3.5.7.1.1 Required ntervals
asts da
ir pp tion
hown in Tabl n for a req ts at
pe provided
for th
ata supporting ot
hall be as defined
he m te n broa r al ch d
in Tabl
3.5.7.1.2 SBAS radio onitori SBAS sh n arameters show
able B-55 and take the indica
Note.— SBAS may br ages (T ss t h da adcas
3.5.7.1.3 l broadc No ssage message ne info
its broadcast
3.5.7.1.4 Alma
an 150 km (81
l broad
sition.
ac d (defined
ssag
.4 rror
a PR
3.5.7.1.5 Recommendation.— SBAS should
vider.
APP B-65 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.5.7.2 Ranging function. If an with the requirements contained in
this section in addition to the requirements of 3.5.7.1.
3.5.7.2.1 formance requirements
Note.— See Chapt 2
3.5.7.2.2 Ranging func ta. SBAS shall broadcast ra ing function data such that the SBAS satellite position error
p e line-o y user i footprin AS satellite shall broadcast
a nting an the the
. AS provides a satellite status function, it shall also comply with the
re ed on.
3.5.7.3.1 Performance of satellite status nctions. Give y valid combination of active data, the probability of a
horizontal error exceedin LSBAS (as de in 3.5.5.6) for longer than 8 consecutive seconds shall be less than 10–7 in
any hour, assuming a user with zero latency.
data d to be data that have not timed out per 3.5.8.1.1. This requirement includes core satellite
c s) and SBAS failures.
mask and Issue of data — IODP). SBAS shall broadcast a PRN mask and IODP (Type 1 message).
T lues shall indicate whether or not data are being provided for each GNSS satellite. The IODP shall change
when there is a change in the PRN mask. The c ange of IODP in Type 1 messages shall occur before the IODP changes in
a e. The IODP in Ty 25 ual the IODP broadcast in the PRN mask
m pe 1 message) used to designate the satellites for which data are provided in that message.
Table B-54. Data broadcast intervals and supported functions
Data type
Maximum
broadcast
interval Ranging
GNSS
satellite
status
Basic
differential
correction
Precise
differential
correction
Associated
message
types
SBAS provides a ranging function, it shall comply
Per
er 3, 3.7.3.4. .1.
tion da ng
rojected on th
URA represe
f-sight to an
estimate of
n the satellite t is less than 256 metres. Each SB
standard deviation of ranging errors referenced to SNT.
3.5.7.3 GNSS satellite status function
quirements contain
If an SB
in this secti
fu n an
g the HP fined
Note.— Active is define
onstellation(
3.5.7.3.2 PRN PRN (
he PRN mask va
h
ny other messag
　
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