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3.5.7.5.3 Ionospheric corrections. SBAS shall broadcast ionospheric corrections for the IGPs designated in the IGP
mask (IGP mask values equal to “1”).
3.5.7.5.4 Ionospheric integrity data. For each IGP for which corrections are provided, SBAS shall broadcast GIVEI
ata such that the integrity requirement in 3.5.7.5.1 is met. If the ionospheric correction or σ 2
i,GIVE exceed their coding range,
BAS shall indicate that the IGP is unhealthy (designated in the correction data). If σ 2
i,GIVE cannot be determined, SBAS
shall indicate that the IGP is “Not Monitored” (designated in the GIVEI coding).
pe 10 message) such that the integrity
quirement in 3.5.7.5.1 is met.
.5.7.
there is a
change in any Type 27 message data.
3.5.7.6.3 Clock-ephemeris covariance matrix. If clock-ephemeris covariance matrix data are broadcast, they shall be
broadcast for all monitored satellites as defined in 3.5.4.10 (Type 28 message) and Type 27 messages shall not be broadcast.
3.5.7.7 MONITORING
3.5.7.7.1 SBAS radio frequency monitoring. The SBAS shall monitor the SBAS satellite parameters shown in
a
shall be defined as a horizontal error exceeding the HPLSBAS or a vertical error exceeding the VPLSBAS (as defined in 3.5.5.6).
When an out-of-tolerance condition is detected, the resulting alert message (broadcast in a Type 2 to 5 and 6, 24, 26 o
m
Note 1.— Active dat
c
3.5.7.5.2 Ionospheric grid point (IGP) mask. SBAS shall broadcast an IGP mask
meI
G Band 10 is used, then the IGP mask values for IGPs south of 55°S in Bands 0 through 8 shall be set to “0”. The IODIk
shall change when there is a change of IGP mask values in the kth band. The new IGP mask shall be broadcast in a Type 18
message before it is referenced in a related Type 26 message. The IODI in Type 26 m
times before referencing it in a Type 26 message to ensure that users receive the new mask. The same IODIk should be used
for all bands.
d
S
3.5.7.5.5 Degradation data. SBAS shall broadcast degradation parameters (Ty
re
3 6 OPTIONAL FUNCTIONS
3.5.7.6.1 Timing data. If UTC time parameters are broadcast, they shall be as defined in 3.5.4.8 (Type 12 message).
3.5.7.6.2 Service indication. If service indication data are broadcast, they shall be as defined in 3.5.4.9 (Type 27
message) and Type 28 messages shall not be broadcast. The IODS in all Type 27 messages shall increment when
Table B-55 and take the indicated action.
APP B-69 23/11/06
Annex 10 — Aeronautical Communications Volume I
Note.— In addition to the radio frequency monitoring requirements in this section, it will be necessary to make special
provisions to monitor pseudo-range acceleration specified in Chapter 3, 3.7.3.4.2.1.5, and carrier phase noise specified in
3.5.2.2 and correlation loss in 3.5.2.5, unless analysis and testing shows that these parameters cannot exceed the stated limits.
3.5.7.7.2 Data monitoring. SBAS shall monitor the satellite signals to detect conditions that will result in improper
operation of differential processing for airborne receivers with the tracking performance defined in Attachment D, 8.11.
3.5.7.7.2.1 The ground subsystem shall use the strongest correlation peak in all receivers used to generate the pseudorange
corrections.
3.5.7.7.2.2 The ground subsystem shall also detect conditions that cause more than one zero crossing for airborne
receivers that use the Early-Late discriminator function as defined in Attachment D, 8.11.
3.5.7.7.2.3 The monitor action shall be to set UDRE to “Do Not Use” for the satellite.
3.5.7.7.2.4 SBAS shall monitor all active data that can be used by any user within the service area.
3.5.7.7.2.5 SBAS shall raise an alarm within 5.2 seconds if any combination of active data and GNSS signals-in-space
sults i
all raise an alarm within 8 seconds if any combination of active data and GNSS signals-in-space
sults in an out-of-tolerance condition for en-route through APV I (3.5.7.4.1).
s to all failure conditions, including failures in core satellite constellation(s) or SBAS
tellites. This monitoring assumes that the aircraft element complies with the requirements of RTCA/DO-229C, except as
pe
3.5.7.8 Robustness to core satellite constellation(s) failures. Upon occurrence of a core satellite constellation(s)
ed.
Note 1.— The parameters that are referred to in th are define
Note 2.— Some of the requirements of this section may not apply to equipment that integrates add ional navigation
sensors, AS with iner avigation sensors
3.5. SS receiver. Except as specifically noted, the SBAS- ble GNSS rece the
signals and meet the requirements specified (GPS rec and/or 3.2.3.1 (G SS receiver).
　
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