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- θ (MAXIMUM) AAZ
+ (MAXIMUM) AAZ θ + (MAXIMUM) BAZ θ
- (MAXIMUM) BAZ
“FRO”
SCAN
“TO”
SCAN
BACK
AZIMUTH
ANTENNA
APPROACH
DIRECTION
θ
“TO”
SCAN
23/11/06 ATT G-64
Attachment G Annex 10 — Aeronautical Communications
APPROACH
AZIMUTH
ANTENNA
80°
(NORMALLY ± 40°) ANTENNA
BORESIGHT
15°
6 000 m
(20 000 ft)
41.7 km (22.5 NM)
600 m
(2 000 ft)
41.7 km
~22 km (22.5 NM)
(~12 NM)
APPROACH
AZIMUTH
ANTENNA
LATERAL COVERAGE
ADDITIONAL COVERAGE
TO 120 (Normally 60 )
POSSIBLE
° ± °
Note.— The above represents the coverage sector originating at the phase centre of the installed antenna.
HORIZONTAL
Not to scale
VERTICAL COVERAGE
Figure G-5A. Approach azimuth region coverage
ATT G-65 23/11/06
Annex 10 — Aeronautical Communications Volume I
Not to scale
MLS DATUM POINT
90 m
(300 ft)
±10°
RUNWAY CENTRE LINE
37 km (20 NM)
MINIMUM OPERATIONAL COVERAGE
REGION
6 000 m
(20 000 ft)
HORIZONTAL
600 m
(2 000 ft)
600 m
APPROACH (2 000 ft)
AZIMUTH
ANTENNA
30° 20° 15°
2.5 m (8 ft)
VERTICAL COVERAGE
RUNWAY REGION
ADDITIONAL COVERAGE
RECOMMENDED
Note. The above represents the minimum proportional guidance sector required, irrespective of
equipment location or orientation.
—
LATERAL COVERAGE
Figure G-5B. Azimuth runway region coverage and minimum operational coverage region
23/11/06 ATT G-66
Attachment G Annex 10 — Aeronautical Communications
ADDITIONAL
COVERAGE
RECOMMENDED
600 m (2 000 ft)
2.5 m (8 ft)
BACK
AZIMUTH
ANTENNA
30°
15°
20°
3 000 m (10 000 ft)
0.9°
18.5 km (10 NM)
VERTICAL COVERAGE
Not to scale
THRESHOLD
45 m (150 ft)
BACK
AZIMUTH
ANTENNA
45 m (150 ft)
20°
20°
18.5 km (10 NM)
BACK
AZIMUTH OR
DEPARTURE
DIRECTION
LATERAL COVERAGE
Figure G-6. Back azimuth region coverage
ATT G-67 23/11/06
Annex 10 — Aeronautical Communications Volume I
NEGATIVE LIMITS OF SCAN
POSITIVE LIMITS OF SCAN
WIDTH OF PROPORTIONAL GUIDANCE SECTOR
WIDTH OF PROPORTIONAL GUIDANCE SECTOR
POSITIVE
LIMITS OF SCAN
NEGATIVE
LIMITS OF SCAN
“FRO” SCAN
TIME SLOT
“FRO” SCAN
TIME SLOT
“TO” SCAN
TIME SLOT
“TO” SCAN
TIME SLOT
0°
0°
0°
0°
MIDSCAN POINT
MIDSCAN POINT
APPROACH AZIMUTH
BACK AZIMUTH
FLY-RIGHT
CLEARANCE
PULSES
FLY-LEFT
CLEARANCE
PULSES
SCANNING
BEAM
PULSES
Figure G-7. Clearance pulse conventions for azimuth functions
23/11/06 ATT G-68
Attachment G Annex 10 — Aeronautical Communications
SB and clearance in-phase SB and clearance out-of-phase
Clearance first Clearance last Clearance first Clearance last
TIME REFERENCED TO CLEARANCE PULSE EDGE (μs)
VIDEO AMPLITUDE (dB)
0 μs 0 μs
5 μs 5 μs
10 μs 10 μs
0
-10
-20
-30
0
-10
-20
-30
0
-10
-20
-30
0 100 200 -200 -100 0 0 100 200 -200 -100 0
Figure G-8. Examples of received video waveforms in SB/clearance
transition region for switching times of 0, 5 and 10 microseconds
ATT G-69 23/11/06
Annex 10 — Aeronautical Communications Volume I
“FRO”
SCAN
+ ΘEL(MAXIMUM)
Not to scale
ELEVATION
GUIDANCE ANGLE LINE OF ZERO ANGLE
(HORIZONTAL)
“TO”
RUNWAY SCAN
THRESHOLD
APPROACH ELEVATION
ANTENNA
Figure G-9. Scanning conventions for approach elevation function
23/11/06 ATT G-70
Attachment G Annex 10 — Aeronautical Communications
APPROACH
ELEVATION
ANTENNA
APPROACH
ELEVATION
ANTENNA
37 km (20 NM)
FROM THRESHOLD
LATERAL COVERAGE
7.5°
HORIZONTAL
600 m
(2 000 ft)
6 000 m
(20 000 ft)
VERTICAL COVERAGE
ADDITIONAL COVERAGE
POSSIBLE TO 28°
Note.— The above represents the coverage sector originating at the phase centre of the installed antenna.
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