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each GLONASS satellite, SBAS shall translate satellite coordinates into WGS-84 as defined in 3.5.5.2 prior to determining
the long-term corrections. For each GPS satellite, the broadcast IOD shall match both the GPS IODE and 8 LSBs of IODC
associated with the clock and ephemeris data used to compute the corrections (3.1.1.3.1.4 and 3.1.1.3.2.2). Upon transmission
of a new ephemeris by a GPS satellite, SBAS shall continue to use the old ephemeris to determine the fast and long-term
error corrections for at least 2 minutes and not more than 4 minutes. For each GLONASS satellite, SBAS shall compute and
broadcast an IOD that consists of a latency and a validity interval as defined in 3.5.4.4.1.
Note.— The criteria for satellite visibility include the locations of reference stations and the achieved mask angle at
those locations.
3.5.7.4.3 Fast corrections. SBAS shall determine fast corrections for each visible GNSS satellite indicated in the PRN
mask (PRN mask value equal to “1”). Unless the IODF = 3, each time any fast correction data in Type j (j = 2, 3, 4 or 5)
message changes, the IODFj shall sequence “0, 1, 2, 0, ...”.
Note.— If there is an alarm condition, the IODFj may equal 3 (see 3.5.7.4.5).
ime offset as defined in Table B-44.
3.5.7.4.5 Integrity data. For each satellite for which corrections are provided, SBAS shall broadcast integrity data
27 or 28 message data to calculate δUDRE) such that the integrity requirement in 3.5.7.4.1 is
et. If the fast corrections or long-term corrections exceed their coding range, SBAS shall indicate that the satellite is
nh
Fj for the fast corrections received in Type j message to which the σ i,UDRE apply; or
b) the IODFj shall equal 3 if the σ 2
i,UDRE apply to all valid fast corrections received in Type j message which have not
timed out.
3.5.7.4.6 Degradation data. SBAS shall broadcast degradation parameters (Type 7 message) to indicate the applicable
rrections and ensure that the integrity requirement in 3.5.7.4.1 is met.
Note.— Active data is defined to be data that has not timed out per 3.5.8.1.1. This requirement includes core satellite
constellation(s) and SBAS failures.
3.5.7.4.2 Long-term corrections. Except for SBAS satellites from the same se
dcast long-term corrections for each visible GNSS satellite (see Note) indicated i
3.5.7.4.2.1 Recommendation.— To ensure accurate range rate corrections, SBAS should minimize discontinuities in
the satellite ephemerides after application of long-term corrections.
3.5.7.4.4 Timing data. If data are provided for GLONASS, SBAS shall broadcast the timing message (Type 12
message) including GLONASS t
(UDREIi and, optionally, Type
mu
ealthy (“Do Not Use”). If σ2
i,UDRE cannot be determined, SBAS shall indicate that the satellite is “Not Monitored”.
If Type 6 message is used to broadcast σ 2
i,UDRE, then:
a) the IODFj shall match the IOD 2
time out interval for fast co
3.5.7.5 Precise differential correction function. If SBAS provides a precise differential correction function, it shall
comply with the requirements contained in this section in addition to the basic differential correction function requirements in
3.5.7.4.
23/11/06 APP B-68
Appendix B Annex 10 — Aeronautical Communications
3.5.7.5.1 Performance of precise differential correction function. Given any valid combination of active data, the
probability of an out-of-tolerance condition for longer than the relevant time-to-alert shall be less than 2 × 10–7 during any
approach, assuming a user with zero latency. The time-to-alert shall be 5.2 seconds for an SBAS that supports precision
pproach or APV-II operations, and 8 seconds for an SBAS that supports APV-I operations. An out-of-tolerance condition
r 27
essages) shall be repeated three times after the initial notification of the alert condition for a total of four times in 4 seconds.
a is defined to be data that has not timed out per 3.5.8.1.1. This requirement includes core satellite
onstellation(s) and SBAS failures.
Note 2.— Subsequent messages can be transmitted at the normal update rate.
and IODIk (up to 11 Type 18
essages, corresponding to the 11 IGP bands). The IGP mask values shall indicate whether or not data are being provided for
ach IGP. If IGP Band 9 is used, then the IGP mask values for IGPs north of 55°N in Bands 0 through 8 shall be set to “0”. If
P
k essage shall equal the IODIk broadcast
in the IGP mask message (Type 18 message) used to designate the IGPs for which data are provided in that message.
3.5.7.5.2.1 Recommendation.— When the IGP mask is changed, SBAS should repeat the Type 18 message several
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