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id
Note 1.— In the case of a satellite designated unhealthy by the core satellite constellation(s) health flag, SBAS may b
a to broadcast ephemeris and clock corrections that will allow the user to continue using the satellite.
Note 2.— If satellites identified as “Not Monitored” by SBAS are used in the position solution, inte
b
3.5.8.4 BASIC AND PRECISE DIFFERENTIAL FUNCTIONS
3.5.8.4.1 Core satellite constellation(s) ranging accuracy. The root-mean-square (1 sigma) of the total airborne
contribution to the error in a corrected pseudo-range for a GPS satellite at the minimum received signal power level
(Chapter 3, 3.7.3.1.5.4) under the worst interf
e
e
under the worst interference environment as defined in 3.7 shall be less than or
3.5.8.4.2 Precision approach and APV operations
3.5.8.4.2.1 The receiver shall compute and apply long-term corrections, fast corrections, range r
multiplied by the square of the ratio of GLONASS to GPS frequencies (fGLONASS/fGPS)2.
less than 0.15
APP B-73 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.5.8.4.2.4 The receiver shall compute and apply horizontal and vertical protection levels defined in 3.5.5.6. In this
computation, σtropo shall be:
2
i
1 0.12 m
0.002 sin ( )
×
+ θ
where θi is the elevation angle of the ith satellite.
In addition, σair shall satisfy the condition that a normal distribution with zero mean and a standard deviation equal to σair
bounds the error distribution for residual aircraft pseudo-range errors as follows:
n
y
f (x)dx Qy for all y 0 and
∞ ≤ ⎛⎜⎝σ⎞⎟⎠ σ≥ ∫
y
n
f (x)dx Qy for all y 0
−
−∞
≤ ⎛⎜⎝σ⎞⎟⎠ σ ≥ ∫
where
fn(x) = probability density function of the residual aircraft pseudo-range error and
x)
=
t2
2
x
1 e d
2
∞ −
π Q( ∫ t
Note.— The standard allowance for airb ay be used to bound the multipath errors.
ll be
entical to the service provider ID in the FAS data block, except if ID equals 15 in the FAS data block.
Note.— For SBAS, FAS data e data for validation of a cyclic
redundancy check is shown in At 3.6.4.5 in that it contains the
BAS HAL and VAL for the p cted using SBAS pseudo-range
be used. If the service provider ID in the FAS data block equals 14, then SBAS precise differential
orrections cannot be used for the approach.
rrections, fast corrections and range rate corrections.
c corrections.
Note.— Two methods of computing ionospheric corrections are provided in 3.1.2.4 and 3.5.5.5.2.
3.5.8.4.3.3 The receiver shall apply a tropospheric model such that residual pseudo-range errors have a mean value (μ)
less than 0.15 metres and a standard deviation less than 0.07 metres.
Note.— A model was developed that meets this requirement. Guidance is provided in Attachment D, 6.7.3.
orne multipath defined in 3.6.5.5.1 m
3.5.8.4.2.5 For precision approach and APV operations, the service provider ID broadcast Type 17 message sha
id
blocks are stored in airborne databases. The format of th
tachment D, 6.6. It differs from the GBAS FAS data block in
S articular approach procedure. For approaches condu
corrections, the service provider ID in the FAS data block is the same as the service provider ID broadcast as part of the
health and status information in Type 17 message. If the service provider ID in the FAS data block equals 15, then any
service provider can
c
3.5.8.4.3 Departure, en-route, terminal, and non-precision approach operations
3.5.8.4.3.1 The receiver shall compute and apply long-term co
3.5.8.4.3.2 The receiver shall compute and apply ionospheri
23/11/06 APP B-74
Appendix B Annex 10 — Aeronautical Communications
3.5.8.4.3.4 The receiver shall compute and apply horizontal and vertical protection levels as defined in 3.5.5.6. In this
computation, stropo shall be:
2
i
0.12 m
0.002 sin ( )
×
+ θ
1
here θi is the elevation angle of the ith satellite.
ition, σair shall satisfy the condition that a normal distribution with zero mean and standard deviation equal to σair
the error distribution for residual aircraft pseudo-range errors as follows:
w
In add
bounds
n
y
f (x)dx Qy for all y 0 and
∞ ≤ ⎛⎜⎝σ⎞⎟⎠ σ≥ ∫
y
fn(x)dx Q for all 0
　
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