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1. aircraft stopped (ground speed < 0.2315 km/h (0.125 kt))
2-8 0.23 15 kmlh (0.125 kt) 5 ground speed < 1.852 krrh (1 kt)
9-12 1.852 k~nh(1 kt) $ ground speed < 3.704 kmh (2 kc)
(in 0.2315 km/h (0.125 kt) steps)
(in 0.463 kmlh (0.25 kt) steps)
28/11/02
No. 77
Part 1 Annex 10 - Aeronautical Rlecommunications
Encoding
- . -
Meaning Quantization
3.704 kmh (2 kt) ground speed < 27.78 km/h (15 kt) (in 0.926 kmlh (0.5 kt) stcps)
27.78 kmlh (15 kt) <ground speed < 129.64 km/h (70 kt) ( ~ n1. 852 km/h (1.0 kt) steps)
129.64 kmlh (70 kt) 5 ground speed < 185.2 k n h (100 kt)
185.2 kmh (100 kt) 5 ground speed < 324.1 W h (175 kt)
ground speed 2 324.1 krnh (175 kt)
Reserved
Reserved
(in 3.704 kmlh (2.0 kt) steps)
(in 9.26 km/h (5.0 kt) steps)
2.3.3.2 GROUNDT RACK (TRUE)
2.3.3.2.1 Ground track status
This I-bit field shall define the validity of the ground track value. Coding for this field shall be as follows: 0 = invalid and 1 = valid.
2.3.3.2.2 Gmund truck value
This 7-bit (14-20) field shall define the direction (in degrees clockwise from true north) of aircraft motion on the surface. The
ground track shall, be encoded as an unsigned angular weighted binary numeral, with an MSB of 180 degrees and an LSB of
3601128 degrees, with zero indicating true north. The data in the field shall be rounded to h e nearest multiple of 3601128 degrees.
2.3 3.3 COMPACPTO SITION REPORTING (CPR) FORMAT (F)
The 1-bit (22) CPR format field for the surface position message shall be encoded as specified for the airborne message. That is,
F = 0 shall denote an even format coding, while F = 1 shall denote an odd format coding (2.6.7).
2.3.3.4 RME SYNCHRONIlzATlON (T)
This 1-bit field (21) shall indicate whether or not the time of applicability of the message is synchronized with UTC time. T = 0
shall denote that the time is not synchronized to UTC. T = 1 shall denote that time of applicability is synchronized to UTC time.
Synchronization shall only be used for surface position messages having the top two horizonlal position precision categories (fomat
type codes 5 and 6).
When T = 1, the time of validity in the surface message format shall be encoded in the 1-bit F field which (in addition to CPR
format type) indicates the 0.2 second time tick for UTC time of position validity. The F bit shall alternate between 0 and 1 for
successive 0.2 secoild time ticks, beginning with F = 0 when the time of applicabilily is an exact even-numbered UTC second.
The latitudellongitude field in the surface message shall be a 34-bit field con~aining the latitude and longitude coding of the
aircraft's surface position. The latitude (Y) and longitude (X) shall each occupy 17 bits. The surface latitude and longitude encodings
shall contain the low-order 17 bits of the 19-bit CPR-encoded values defined in 2.6.
Note.- The ummbiguous mnge for local decoding of surface messages is 166.5 km (90 NM). The positioml accurucy
maintained by the surjuce CPR encoding is approxim,utely 1.25 metres. The 1atitudeAongitude encodiizg is also n function of the
CPR fornznt value (the "F" hit) described above.
28111102
No. 77
Annex 10 - Aeronautical Telecommunications
2.3.3.5.1 Extrapolating position (when T = I )
This extrapolation shall conform to 2.3.2.3.1 (substitute "surface" for "airborne" where appropriate).
Volume ZZZ
2.3.3.5.2 Extrapolating position (when T = 0)
This extrapolation shall conform to 2.3.2.3.2 (substitute "surface" for "airbome" where appropriate).
2.3.3S.3 Timeout when new position data are unavailuble
This timeout shall conform to 2.3.2.3.3 (substitute "surface" for "airborne" where appropriate).
2.3.4 ~ENTIFICATION AND CATEGORY FORMAT
The identification and category squittcr shall be formatted as specified in the definition of BDS 0,s.
The airborne velocity squitter shall be formatted as specified in the definition of register number 0gI6 and in the following
paragraphs,
2.3.5.1 SUBTYPES 1 AND 2
Subtypes 1 and 2 of the airborne velocity formal shall be used when the transmitting aircraft's velocity over ground is known.
Subtype 1 shall be used at subsonic velocities while subtype 2 shall be used when the velocity exceeds 1 022 kt.
This message shall no1 be broadcast if the only valid data are the intent change flag and the IFR capability flag (2.3.5.3, 2.3.5.4).
After initialization, the broadcast shall be suppressed by loading register 0g16 with all zeros and then discontinuing the updating of
the register until data input is available again.
The supersonic vcrsion of the velocity coding shall be used if either the east-west OR north-south velocities exceed 1 022 kt. A
　
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