Technical Provisions for Mode S Services and Extended Squitter

DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
C-76 Technical Provisions for Mode S Services and Extended Squitter
C.3.7 FORMATS FOR 1090 MHZ TIS-B MESSAGES
Figure C-12. TIS-B Fine Airborne Position Message
1 Purpose: To provide airborne position information for
2 aircraft that are not equipped with 1090 MHz ADS-B
3 FORMAT TYPE CODE service is based on high quality surveillance data.
4
5
(See §C.2.3.1 and Note 1)
6 MSB SURVEILLANCE STATUS Surveillance Status coding:
7 LSB 0 = no condition information
8 IMF (§C.3.4.1.1) 1 = permanent alert (emergency condition)
9 2 = temporary alert (change in Mode A identity code other than
10 emergency condition)
11
12
3 = SPI condition
13 PRESURE ALTITUDE
14
15
Codes 1 and 2 take precedence over code 3.
16 The altitude code (AC) as specified in §2.2.13.1.2 of
17 DO-181D (EUROCAE ED-73C, §3.17.1.b),
18
19
20
but with the M-bit removed.
21 RESERVED
22 CPR FORMAT (F) (§C.2.3.2.1)
23
24
25
26
27
28
MSB
29 CPR ENCODED LATITUDE
30 CPR Airborne Format
31
32
33
34
35
36
37
38
(§C.2.6.1 to §C.2.6.10)
39 LSB
40
41
42
43
44
45
MSB
46 CPR ENCODED LONGITUDE
47 CPR Airborne Format
48
49
50
51
52
53
54
55
(§C.2.6.1 to §C.2.6.10)
56 LSB
Draft
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris