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pe 2 to 5, 7, 24 and messages shall eq
essage (Ty
Clock-Ephemeris covariance matrix 120 s 28
SBAS in test mode 6 s 0
PR
R R 2 to 6, 24
Fast corrections 60 s R* R R 2 to 5, 24
Lo
gradation 120 s R* R R 7
Degradation parameters 120 s R 10
Io
R 26
Timing data 300 s R R R R 12
R R R 17
Service level 300 s 27
Notes.—
1. “R” indicates that the data must be broadcast to support the function.
2. “R*” indicates special coding as described in 3.5.7.3.3.
3. Type 12 messages are only required if data are provided for GLONASS satellites.
N mask 120 s R R R 1
UDREI 6 s R*
ng-term corrections 120 s R* R R 24, 25
GEO ranging function data 120 s R 9
Fast correction de
nospheric grid mask 300 s R 18
Ionospheric corrections, GIVEI 300 s
(see Note 3) (see Note 3) (see Note 3) (see Note 3)
Almanac data 300 s R
23/11/06 APP B-66
Appendix B Annex 10 — Aeronautical Communications
Table B-55. SBAS radio frequency monitoring
Parameter Reference Alarm limit Required action
Signal power level Chapter 3,
3.7.3.4.4.3
minimum = –161 dBW
maximum = –153 dBW
(Note 2)
Minimum: cease ranging function (Note 1).
Maximum: cease broadcast.
Modulation Chapter 3,
3.7.3.4.4.5
monitor for
waveform distortion
Cease ranging function (Note 1).
phase deviation (Notes 2 and 3)
less σ 2
UDRE and URA reflect error.
Convolutional
en
3.5.2.9 all transmit messages Cease broadcast.
1. Ceasing the ranging function is accomplished by broadcasting a URA and σ 2
UDRE of “Do Not Use” for that SBAS satellite.
2. These parameters can be monitored by their impact on the received signal quality (C/N0 impact), since that is the impact on the user.
3. Alarm limits are not specified because the induced error is acceptable, provided it is represented in the σ 2
UDRE and URA parameters. I
SNT-to-GPS time Chapter 3,
3.7.3.4.5
N/A
(Note 3)
Cease ranging function unless URA reflects error.
Carrier frequency
stability
3.5.2.1 N/A
(Note 3)
Cease ranging function unless σ2
UDRE and URA reflect error.
Code/frequency
coherence
3.5.2.4 N/A
(Note 3)
Cease ranging function unless σ 2
UDRE and URA reflect error.
Maximum code 3.5.2.6 N/A Cease ranging function un
coding are erroneous
Notes.—
f the error
cannot be represented, the ranging function must cease.
3.5.7.3.2.1 Recommendation.— When the PRN mask is changed, SBAS should repeat the Type 1 message several
times before referencing it in other messages to ensure that users receive the new mask.
3.5.7.3.3 Integrity data. If SBAS does not provide the basic differential correction function, it shall transmit fast
corrections, long-term corrections and fast correction degradation parameters coded to zero for all visible satellites indicated
in the PRN mask.
3.5.7.3.3.1 If SBAS does not provide the basic differential correction function, SBAS shall indicate that the satellite is
unhealthy (“Do Not Use”) if the pseudo-range error exceeds 150 metres.
3.5.7.3.3.2 If SBAS does not provide the basic differential correction function, SBAS shall indicate that the satellite is
Not
l transmit a UDREIi of 13 if
e satellite is not “Do Not Use” or “Not Monitored”.
3.5.7.3.3.4 The IODFj parameter in Type 2 to 5, 6 or 24 messages shall be equal to 3.
“ Monitored” if the pseudo-range error cannot be determined.
3.5.7.3.3.3 If SBAS does not provide t he basic differential correction function, SBAS shal
th
APP B-67 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.5.7.4 Basic differential correction function. If an SBAS provides a basic differential correction function, it shall
comply with the requirements contained in this section in addition to the GNSS satellite status function requirements defined
in 3.5.7.3.
3.5.7.4.1 Performance of basic differential correction function. Given any valid combination of active data, the
probability of a horizontal error exceeding the HPLSBAS (as defined 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.
rvice provider, SBAS shall determine and
broa n the PRN mask (PRN mask value equal
to “1”). The long-term corrections shall be such that the core satellite constellation(s) satellite position error projected on the
line-of-sight to any user in the satellite footprint after application of these long-term corrections is less than 256 metres. For
　
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