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−∞
y y − ≤ ⎜⎛σ⎟⎞ σ ≥
re
fn(x) = probability density function of the residual aircraft pseudo-range error and
x) =
⎝ ⎠ ∫
whe
t2
2
x
1 e d
2
∞ −
π Q( ∫ t
Note.— The standard allowance for airborne multipath defined in 3.6.5.5.1 may be used to bound the multipath errors.
3.5.8.4.4 Recommendation.— For departure, en-route, terminal, and non-precision approach operations, the receiver
Note.— Guidance material on the interface providers is given in Attachment D, 6.3.
3.6 Ground-based augmentation system (GBAS) and
ground-based regional augmentation s (GRAS)
Note.— In this section, except where specifically annotated, reference roach with vertical guidance (APV) means
APV-I and APV-II.
3. GENERAL
The GBAS shall consist of a ground subsyste and an aft subsystem. The GBAS ground subsystem shall provide data
and corrections for the GNSS ranging signals over a digital VHF data broadcast to the aircraft subsystem. The GRAS ground
subsystem shall consist of one or more GBAS ground subsystems.
Note.— Guidance material is provided in Attachment D, 7.1.
should use the broadcast ionospheric corrections, when available, and a tropospheric model with performance equal to that
specified in 3.5.8.4.3.
3.5.9 INTERFACE BETWEEN SBAS
between different SBAS service
ystem
to app
6.1
m aircr
APP B-75 23/11/06
Annex 10 — Aeronautical Communications Volume I
3.6.2 RF CHARACTERISTICS
3.6.2.1 Carrier frequency stability. The carrier frequency of the data broadcast shall be maintained within ±0.0002 per
BAS messages shall be assembled into symbols, each consisting of 3
onsecutive message bits. The end of the message shall be padded by 1 or 2 fill bits if necessary to form the last 3-bit symbol
f th
Note.— The carrier phase for the kth symbol ( φ
k) is given by: φ
k = φk-1 + Δφk
3.6.2.3 Modulation wave form and pulse shapi . The output f differential phase encoder shall be filtered by a
ulse shaping filter whose output, s(t), is describe
s(t) e h (t kT)
=∞
= Σ φ −
k
se of a raised-cosine filter with α = 0.6. The time
cent of the assigned frequency.
3.6.2.2 Bit-to-phase-change encoding. G
c
o e message. Symbols shall be converted to D8PSK carrier phase shifts (Δφk) in accordance with Table B-58.
ng filters o
d as follows:
p
k
k
j
k=−∞
where
h = the impulse response of the raised cosine filter;
φ = (as defined in 3.6.2.2);
t = time; and
T = the duration of each symbol = 1/10 500 second.
This pulse shaping filter shall have a nominal complex frequency respon
response, h(t), and frequency response, H(f), of the base band filters shall be as follows:
2
sin tcos t
h(t) T T
t1 2t
T T
⎛ π ⎞ ⎛ πα ⎞
⎜ ⎟ ⎜ ⎟
= ⎝ ⎠ ⎝ ⎠
π ⎡⎢ −⎛⎜ α⎞⎟ ⎤⎥
⎢⎣ ⎝ ⎠ ⎥⎦
1 for 0 f 1
2T
1 sin (2fT 1)
H(f ) 2 for 1 f 1
2 2T 2T
0 for f 1
2T
− α ⎧ ≤ < ⎪⎪
π ⎛ ⎞ ⎪ − − ⎜ ⎟ ⎪ −α +α ⎪ α ⎝ ⎠ = ≤ ≤ ⎨⎪ ⎪⎪ > + α
3.6.2.4 Error vector magnitude. The error vector magnitude of the transmitted signal shall be less than 6.5 per cent
ot
3.6.2.5 RF data rate. The symbol rate shall be 10 500 symbols per second ±0.005 per cent, resulting in a nominal bit
te
⎪⎪
⎩
The output s(t) of the pulse shaping filter shall modulate the carrier.
ro -mean-square (1 sigma).
ra of 31 500 bits per second.
23/11/06 APP B-76
Appendix B Annex 10 — Aeronautical Communications
Table B-58. Data encoding
Message bits Symbol phase shift
I I I Δφ
1π/4
0 1 1 2π/4
1 1 0 4π/4
1 1 1 5π/4
1 0 1 6π/4
1 0 0 7π/4
Note.— Ij is the where I1 is the firs
3k-2 3k-1 3k k
0 0 0 0π/4
0 0 1
0 1 0 3π/4
jth bit of the burst to be transmitted, t
bit of the training sequence.
ed time slots. Under all operating conditions, the maximum pow z channel
ba , when measured assigned time slot, shall eed –105 dBc
referenced to the authorized transmitter power.
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