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Figure B-9. Frame structure (frame 5)
1n
1n
1n
1n
1n
1n
B1 B2
11 10 2
KP
P
P4 FT NT n M
N4 GPS
String No.
*
*
*
* *
*
*
*
Annex 10 — Aeronautical Communications Volume I
Figure B-10. Data string structure
Figure B-11. Convolutional encoding
Figure B-12. Data block format
2.0 s
1.7 s
Data bits and check bits in bi-binary code (Tc = 10 ms)
Time mark
(Tc = 10 ms)
1111100 ... 110
85 9 8 2 1
Data bits in relative bi-binary
code
0.3 s
Hamming
code check
bits (1–8)
in relative
bi-binary code
Character/numbers within string
Note.— Tc = time duration for each chip
Data input
(250 bits/s)
G4 (1011011)
G3 (1111001)
Symbol
clock
Output symbols
500 symbols/s
(Alternating G3/G4)
+
+ +
+ + +
+ +
212-BIT DATA FIELD
250 BITS/SECOND
24-BIT
CRC
DIRECTION OF DATA FLOW FROM SATELLITE;
MOST SIGNIFICANT BIT (MSB) TRANSMITTED FIRST
6-BIT MESSAGE TYPE IDENTIFIER (0–63)
8-BIT PREAMBLE OF 24 BITS TOTAL IN 3 CONTIGUOUS BLOCKS
23/11/06 APP B-142
Appendix B Annex 10 — Aeronautical Communications
Figure B-13. IGP numbering convention (four IGPs)
Figure B-14. IGP numbering convention (three IGPs)
USER’S IPP
APP B-143 23/11/06
Annex 10 — Aeronautical Communications Volume I
Figure B-15. CW interference thresholds for GPS and SBAS receivers used for
precision approach
Figure B-16. CW interference thres for GLONASS receivers used for
(2 000, -8.5)
-8.5
-4.5 (1 315, -4.5)
(1 626.5, -22)
without Satcom
with Satcom
(1 500, -38)
(1 525, -42)
(1 618, -42)
(1 610, -60)
(1 565.42, -150.5) (1 585.42, -150.5)
1 300 1 400 1 500 1 600 1 700 1 800 1 900 2 000
-160
-140
-120
-100
-80
-60
-40
-20
0
20
Frequency [MHz]
Interference Threshold [dBW]
(2 000, -8.5)
-8.5
(1 315, -4.5)
-4.5
(1 626.15625, -22)
without Satcom
with Satcom
(1 562.15625, -42)
(1 583.65625, -80)
(1 635.15625, -42)
(1 613.65625, -80)
(1 592.9525, -149) (1 609.36, -149)
1 300 1 400 1 500 1 600 1 700 1 800 1 900 2 000
-160
-140
-120
-100
-80
-60
-40
-20
0
20
Frequency [MHz]
Interference Threshold [dBW] holds
precision approach
23/11/06 APP B-144
Appendix B Annex 10 — Aeronautical Communications
Figure B-17. Interference thresholds versus bandwidth for
GPS and SBAS receivers
Figure B-18. Interference thresholds versus bandwidth for
GLONASS
___________________
Interference Bandwidth (kHz)
Interference Threshold [dBW]
Terminal area, en-route and acquisition for all
Non-precision approach
Precision approach and Satcom equipped
0.01 0.1 1 10 100 1 000 1·104 1·105
–110
–120 –119.5
–130
–140 -140.5
–150 –150.5
–160
3dB
6dB
–130
-143
–149
3dB 6dB
–130
–135
–140
–145
–150
–155
–160
0.01 0.1 1 10 100 1·103 1·104 1·105
Terminal area, en-route and acquisition for all
Non-precision approach
Precision approach and Satcom equipped
Interference Bandwidth [kHz]
Interference Threshold [dBW]
APP B-145 23/11/06
ATTACHMENT A. DETERMINATION OF INTEGRITY AND
CONTINUITY OF SERVICE OBJECTIVES
USING THE RISK TREE METHOD
1. The risk tree method is a graphical method of expressing the logical relationship between a particular failure
condition and the causes or failures leading to this condition. It is an application of fault tree analysis being used in the
aerospace industry.
1.1 The method employs a set of logic symbols to show the relationship between the various causes of failure. The
following symbols are used in this guidance material.
The “AND” gate describes the logical operation whereby the coexistence of all input events is required to produce
the output event.
The “OR” gate defines a situation whereby the output event will exist if one or more of the input events exist.
The rectangle identifies an event that results from the combination of fault or failure events through the input logic
gate.
The circle describes a primary failure event that requires no further development. Frequency and mode of failure of
　
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