Genesys GDR- COM Series, Руководство по установке, Страница: 57 / 62

GDR-XXXX NAV/COMM INSTALLATION MANUAL
64-000109 Page 57 of 62
34. ARINC Label 174, G/S Deviation
The calculated ddm of the Glideslope is transmitted on ARINC label 174. When valid data is
not present, the SSM is set to “No Computed Data”.
Table 32: Glideslope Deviation Specification, ARINC Label 174
Label PARAMETER
NAME
UNITS RANGE SIG.
BITS
APPROX.
RESOLUTION
174 Glideslope Deviation DDM ± 0.8 12 0.0002
Table 33: Glideslope Deviation Format, ARINC Label 174
P
a
ri
ty
(
o
d
d
)
S
ig
n
/S
ta
tus
Ma
tri
x
DATA FIELD
MSB
LSB
Res
(SDI)
G/S Deviation
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
-0.125 DDM 0 1 1 1 1 1 0 1 1 0 0 0 0 0 0 0 P P P P P P 0 0 0 0 1 1 1 1 1 0
4 7 1
Note:
1) “P” denotes a pad with a “0” value.
2) Negative values are encoded as the two’s complements of positive values
and the negative sign is annunciated in bit 29.
3) The transmitted binary value is found as ddm/0.8 * 4096, encoded as two’s
complement.
4) The two's complement of an N-bit number is the result of subtracting the
number from 2
N
.
Table 34: 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 35: Sign Bit definition
Bit 29 Meaning
0 Above
1 Below