Technical Provisions for Mode S Services and Extended Squitter

A-70 Technical Provisions for Mode S Services and Extended Squitter
MB FIELD
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
1 MSB
2 FOM/SOURCE
3
4 LSB
5 STATUS (wind speed and direction)
6 MSB = 256 knots
7
8
9 WIND SPEED
10
11 Range = [0, 511] knots
12
13
14 LSB = 1 knot
15 MSB = 180 degrees
16
17
18 WIND DIRECTION (True)
19
20 Range = [0, 360] degrees
21
22
23 LSB =180/256 degrees
24 SIGN
25 MSB = 64°C
26
27
28
29 STATIC AIR TEMPERATURE
30
31 Range = [–128, +128] °C
32
33
34 LSB = 0.25°C
35 STATUS
36 MSB = 1 024 hPa
37
38
39
40
41
AVERAGE STATIC PRESSURE
42
43
44
45
Range = [0, 2 048] hPa
46 LSB = 1 hPa
47 STATUS
48 MSB TURBULENCE (see 1)
49 LSB
50 STATUS
51
52
MSB = 100 %
53 HUMIDITY
54
55
Range = [0, 100] %
56 LSB = 100/64 %
Table A-2-68. BDS code 4,4 — Meteorological routine air report
PURPOSE: To allow meteorological data to be collected by
ground systems.
FOM/SOURCE coding:
The decimal value of the binary coded (figure of merit)
FOM/SOURCE parameter shall be interpreted as follows:
0 = Invalid
1 = INS
2 = GNSS
3 = DME/DME
4 = VOR/DME
5 to 15 = Reserved
1) The interpretation of the two bits assigned to TURBULENCE shall be as
shown in the table for register 4516.
Note 1.— The average static pressure is not a requirement of Annex 3.
Note 2.— Two’s complement coding is used for all signed fields as
specified in §A.2.2.2.
Note 3.— The requirement for the range of wind speeds in Annex 3 is
from 0 to 250 knots.
Note 4.— The requirement for the range of static air temperature in
Annex 3 is from –80° C to +60° C.
Draft
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris