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1 – 1 × 10–7 1 – 4 × 10–6
(15 s)
1 000
NOTES.—
1. Data word continuity of service and integrity are included in the specified values of the angle function for each level of service.
2. Back azimuth is not required for basic operations.
3. It is intended that all equipments meet at least Level 2 requirements.
4. If DME/N is used with MLS the figures may be reduced to 1 – 1 × 10–5.
5. The Level 4 exposure times are based on experience with ILS and are consistent with existing operational capabilities. As experience is gained
with MLS, and enhanced operational capabilities are proposed, it may be necessary to adjust these values.
6. MLS/RNAV procedures may require the Level 3 and 4 integrity, continuity of service and MTBO objectives of the elevation, DME/P and, if
used, back azimuth to be equivalent to the approach azimuth equipment.
ATT G-59 23/11/06
Annex 10 — Aeronautical Communications Volume I
PREAMBLE SECTOR
SIGNALS
“TO” SCAN
TIME SLOT
PAUSE
TIME
“FRO” SCAN
TIME SLOT
GROUND RADIATED TEST
(“FRO” PULSE)*
NEXT
PREAMBLE
* AZIMUTH
FUNCTIONS
ONLY
OUT-OF-COVERAGE
INDICATION (PULSE(S))
RECEIVER REFERENCE
TIME CODE
RF CARRIER
ACQUISITION PERIOD
Figure G-1. Angle function organization
23/11/06 ATT G-60
Attachment G Annex 10 — Aeronautical Communications
PAUSE
TIME
PREAMBLE
SECTOR
SIGNALS
REF
TIME
“TO” SCAN
TIME SLOT
“TO”
PULSE
0°
“FRO” SCAN
TIME SLOT
“FRO”
PULSE
MIDSCAN
POINT
t
T0
Tm
0°
Figure G-2. Angle scan timing parameters
ATT G-61 23/11/06
Annex 10 — Aeronautical Communications Volume I
TIME
(ms)
0
10
20
30
40
50
60
66.7 66.8
SEQUENCE
#1
SEQUENCE
#2
APPROACH
ELEVATION
FLARE
APPROACH
AZIMUTH
FLARE
APPROACH
ELEVATION
(NOTE 1)
BACK
AZIMUTH
(NOTE 2)
APPROACH
ELEVATION
FLARE
APPROACH
ELEVATION
FLARE
APPROACH
AZIMUTH
FLARE
APPROACH
ELEVATION
APPROACH
ELEVATION
FLARE
GROWTH
(e.g. 360° AZIMUTH)
(18.2 ms MINIMUM)
(NOTE 2)
(NOTE 3)
Notes:
1. When back azimuth is provided, basic data word 2 must be transmitted only in this position.
2. Data words may be transmitted in any open time periods.
3. The total time duration of sequence #1 plus sequence #2 must not exceed 134 ms.
Figure G-3A. Transmission sequence pair which provides for
all MLS angle guidance functions
23/11/06 ATT G-62
Attachment G Annex 10 — Aeronautical Communications
TIME
(ms)
0
10
30
20
40
50
60
64.9
67.5
APPROACH
ELEVATION
HIGH RATE
APPROACH
AZIMUTH
DATA WORDS
(NOTE 1)
HIGH RATE
APPROACH
AZIMUTH
APPROACH
ELEVATION
HIGH RATE
APPROACH
AZIMUTH
APPROACH
ELEVATION APPROACH
ELEVATION
HIGH RATE
APPROACH
AZIMUTH
APPROACH
ELEVATION
HIGH RATE
APPROACH
AZIMUTH
BACK
AZIMUTH
(NOTE 2)
HIGH RATE
APPROACH
AZIMUTH
APPROACH
ELEVATION
SEQUENCE
#1
SEQUENCE
#2
(NOTE 3)
Notes:
1. Data words may be transmitted in any open time periods.
2. When back azimuth is provided, basic data word 2 must be transmitted only in this position.
3. The total time duration of sequence #1 plus sequence #2 must not exceed 134 ms.
Figure G-3B. Transmission sequence pair which provides for
the MLS high rate approach azimuth angle guidance function
ATT G-63 23/11/06
Annex 10 — Aeronautical Communications Volume I
SEQ.
#2
SEQ.
#1
SEQ.
#2
SEQ.
#1
SEQ.
#2
SEQ.
#1
SEQ.
#2
SEQ.
#1
18 ms
FULL CYCLE = 615 ms (MAXIMUM)
SEQ.
#1
Figure G-3C. Complete multiplex transmission cycle showing
open time periods available for data words
Figure G-4. Scanning conventions for azimuth guidance functions
APPROACH
AZIMUTH
ANTENNA “FRO”
SCAN
APPROACH
AZIMUTH
GUIDANCE
ANGLE
RUNWAY
BACK
AZIMUTH
GUIDANCE
ANGLE
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