Genesys GDR- COM Series, Руководство по установке, Страница: 58 / 62

GDR-XXXX NAV/COMM INSTALLATION MANUAL
64-000109 Page 58 of 62
35. ARINC Label 222, VOR Bearing and Marker Beacon Tones
The calculated VOR Bearing is transmitted on ARINC label 222. When valid data is not
present, the SSM bits are set for no computed data.
Table 36: VOR Bearing Specification, ARINC Label 222
Label
PARAMETER
NAME
UNITS RANGE
SIG.
BITS
APPROX.
RESOLUTION
222 VOR Omni-bearing
180
Degrees
±180˚
12
0.044˚
Table 37: VOR Bearing Format, ARINC Label 222
P
a
ri
ty
(
o
d
d
)
S
ig
n
/S
ta
tus
Ma
tri
x
DATA FIELD
MSB LSB
Sp
a
re
s
(P
a
d
s
)
ILS
M
ar
ker
Be
ac
o
n
T
o
n
e
s
Res
(SDI)
VOR Bearing
Octal
LSB MSB
1 2 4 1 2 4 1 2
Bit # 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
LABEL 222 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 P P 0 0 0 0 0 0 0 1 0 0 1 0 0 1
2 2 2
Note: (1) ‘P’ denotes a pad set for a ‘0’ value.
(2) Negative values are encoded as the two’s complements of positive values and
the negative sign is annunciated in the sign/status matrix.
(3)
Angles in the range 0 to 180˚are encoded as positive numbers. Angles in the
range >
180˚ to
<
360˚ are subtracted from 360˚ and the resulting number
encoded as a negative value per note 2.
(4) Bits 11 to 13 are set as per Table 40 when valid Marker Beacon Tones are
present. The presence of these tones does not affect the SSM matrix. Only
one tone is allowed to be present and shall have a dominance of > 20 dB over
the other tones.
(5) Bit 14 designates ILS mode and indicates only the Marker Tones are functional
and the Data field is parked at all zeros.
Table 38: Status Matrix definition
Bit 31 Bit 30 Status
0 0 Failure Warning
0 1 No Computed Data
1 0 Functional Test
1 1 Functional
Table 39: Sign Bit definition
Bit 29 Meaning
0 Plus
1 Minus
Table 40: Marker Beacon Tone Bit definition
Discrete Bit
Bit State
Tone Dominate No Tone
400 Hz 11 1 0
1,300 Hz 12 1 0
3,000 Hz 13 1 0