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7.15.3 Table D-7A provides an example of a Type 101 VDB message. The additional message flag field is coded to
indicate that this is the first of two Type 101 messages to be broadcast within the same frame. This is done for illustration
purposes; a second Type 101 message is not typically required, except to allow broadcast of more ranging source corrections
than can be accommodated in a single message.
7.15.4 Table D-8 provides examples of a Type 1 VDB message and a Type 2 VDB message coded within a single
burst (i.e. two messages to be broadcast within a single transmission slot). The additional message flag field of the Type 1
message is coded to indicate that it is the second of two Type 1 messages to be broadcast within the same frame. The Type 2
message includes additional data block 1. Table D-8A provides an example of Type 1 and Type 2 messages with additional
data blocks 1 and 2.
7.15.5 Table D-9 provides an example of a Type 4 message containing two FAS data blocks.
7.15.6 Table D-10 provides an example of a Type 5 message. In this example, source availability durations common
to all approaches are provided for two ranging sources. Additionally, source availability durations for two individual
approaches are provided: the first approach has two impacted ranging sources and the second approach has one impacted
ranging source. The Type 2 message includes additional data block 1.
7.16 GBAS survey accuracy
The standards for the survey accuracy for NAVAIDs are contained in Annex 14 — Aerodromes. In addition, the Manual of
the World Geodetic System 1984 (WGS-84) (Doc 9674) provides guidance on the establishment of a network of survey
control stations at each aerodrome and how to use the network to establish WGS-84 coordinates. Until specific requirements
are developed for GBAS, the Annex 14 survey accuracy requirements for NAVAIDs located at the aerodrome apply to
GBAS. The recommendation contained in Appendix B to Chapter 3, 3.6.7.2.3.4, for the survey accuracy of the GBAS
reference point is intended to further reduce the error in the WGS-84 position calculated by an airborne user of the GBAS
positioning service to a value smaller than that established by the requirements of Appendix B to Chapter 3, 3.6.7.2.4.1 and
3.6.7.2.4.2, in the GBAS standards and to enhance survey accuracy compared to that specified in Annex 14. The integrity of
all aeronautical data used for GBAS is to be consistent with the integrity requirements in Chapter 3, Table 3.7.2.4-1.
7.17 Type 2 message additional data block 2
Type 2 message additional data block 2 data may be used in GRAS to enable the GRAS airborne subsystem to switch between
GBAS broadcast stations, particularly if the GBAS broadcast stations utilize different frequencies. Additional data block 2
identifies the channel numbers and locations of the GBAS broadcast station currently being received and other adjacent or
nearby GBAS broadcast stations.
23/11/06 ATT D-30
Attachment D Annex 10 — Aeronautical Communications
ATT D-31 23/11/06
Table D-7. Example of a Type 1 VDB message
DATA CONTENT DESCRIPTION
BITS
USED
RANGE OF
VALUES RESOLUTION VALUES
BINARY REPRESENTATION
(NOTE 1)
BURST DATA CONTENT
Power ramp-up and settling 15 000 0000 0000 0000
Synchronization and ambiguity
resolution
48 0100 0111 1101 1111 1000 1100 0111 0110 0000 0111 1001 0000
SCRAMBLED DATA
Station slot identifier (SSID) 3 — — E 100
Transmission length (bits) 17 0 to 1 824 bits 1 bit 536 000 0000 1000 0110 00
Training sequence FEC 5 — — — 0000 1
APPLICATION DATA MESSAGE BLOCK
Message Block (Type 1 message)
Message Block Header
Message block identifier 8 — — Normal 1010 1010
GBAS ID 24 — — BELL 0000 1000 0101 0011 0000 1100
Message type identifier 8 1 to 8 1 1 0000 0001
Message length 8 10 to 222 bytes 1 byte 61 0011 1101
Message (Type 1 example)
Modified Z-count 14 0 to 1 199.9 s 0.1 s 100 s 00 0011 1110 1000
Additional message flag 2 0 to 3 1 1st of pair 01
Number of measurements 5 0 to 18 1 4 0 0100
Measurement type 3 0 to 7 1 C/A L1 000
Ephemeris Decorrelation
Parameter (P) 8
0 to 1.275
× 10–3m/m 5 × 10–6m/m 1 × 10–4 0001 0100
Ephemeris CRC 16 — — — 0000 0000 0000 0000
Source availability duration 8 0 to 2 540 s 10 s Not provided 1111 1111
Measurement Block 1
Ranging source ID 8 1 to 255 1 2 0000 0010
Issue of data (IOD) 8 0 to 255 1 255 1111 1111
Pseudo-range correction (PRC) 16 ±327.67 m 0.01 m +1.0 m 0000 0000 0110 0100
Range rate correction (RRC) 16 ±32.767 m 0.001 m/s –0.2 m/s 1111 1111 0011 1000
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