UAT-SWG04-WP02 - DFS UAT Impact on DME working groups library/ACP-WG-C-UAT-4/UAT-SWG04-WP02...QUAT...
Transcript of UAT-SWG04-WP02 - DFS UAT Impact on DME working groups library/ACP-WG-C-UAT-4/UAT-SWG04-WP02...QUAT...
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.20031
REPORT ON
UAT impact on DME
Compatibility measurement description and results;
Frequency Planning Criteria
Prepared byThomas Taffner, WTD81; Helmut Günzel, DFS; Otto Lindenau,DFS;
Dr. Armin Schlereth, DFS
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Dr. Armin Schlereth / CNS/CN 28.05.20032
Contents
• Introduction
• Test procedures
• Scenario 1: Interference load with continual overlapQ test procedure detailsQ interference criteriaQ results
• Scenario 2: Interference load with random overlapQ test procedure detailsQ interference criteriaQ results
• Conclusion
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Introduction
Q AMCP/8 (Febr. 2003) decided to pursue development of SARPs for UAT
Q UAT Subgroup of ACP – WG/C established to conduct validation of UAT
Q UAT is a single channel system supporting ADS-B, TIS-B and FIS-B
Q FAA plans for operational usage of UAT in Alaska region on 978 MHz frequency (17X DME reply channel)
Q In Europe DME channel 17X is used on 7 locations
Q Consequence: Compatibility measurements have been conducted specifically dealing with European requirements
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Test Procedures
Q UAT interference on DME reply channel under extreme conditionsQ Each DME reply pulse pair permanently overlapped with interference signalQ Test exercise conducted at DFS labs in Langen (Germany)
Scenario 1: Interference load with continual overlap
Scenario 2: Interference load with random overlap
Q Based on Core Europe Traffic Scenario for the year 2015 called CE2015Q High fidelity interference load created with signal generator controlled by a
PCQ Use of JHU-APL data file to get power distribution of received UAT-ADS-B
Tx at DME victim interrogator RxQ DME victim located at 37000 ft altitude in centre of CE2015Q Test exercise conducted at WTD81 of German Forces in Greding (Germany)
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Test Procedures
Overview of DME devices under test
XXKing KN-65A
XXCollins TCR-451
XX Rockwell Collins DME 42
XX Rockwell Collins DME 40
XXXRockwell Collins DME 900
Scenario 2Scenario 1DMEDME / TACAN type
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Scenario 1: Test Signals
BurstedCPFSK with RC pulse shape filterη = 0.6α = 0.5
Type d
ContinualCW signalType c
ContinualCPFSK with RC pulse shape filterη = 0.6α = 0.5
Type b
ContinualGaussian FSK withη = 0.68
f3dBT = 0.83
Type a
Tx characteristicModulation SchemeType
Bit-rate : fb = 1041667 Bits/s
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Scenario 1: Test Signals – Type a spectrum
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Scenario 1: Test Signals – Type b spectrum
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Scenario 1: Measurement Settings
20 % - 100 % (10 % grid )(70 % as nominal value)
Beacon Reply Efficiency (BRE)
2700, 3600, 5400Pulse Repetition Frequency (PRF) at the DME beacon [ppps]
-66, -76, -83DME interrogator desired signal input power values [dBm]
0, ±1, ± 2DME channel to interferer channel separation [MHz]
66X (1153 MHz)DME channel
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Scenario 1: Interference CriteriaQ Starting with low interference power values and DUT acquired
Q Interference power increased in 1 dB steps
Q At each power setting observation time of 2 minutes used
Q In case distance or velocity indication of DME changed permanently, this
value was noted as BSOP (Break Stable Operating Point)
Q Then power values have been decreased in 1 dB steps
Q At each power setting observation time of 2 minutes used to consider
distance and velocity indication of DUT
Q In case DUT was able to re-acquire this value was noted as ASOP
(Acquire Stable Operating Point)
Q These ASOP values will be used to calculate required distances between
interferer and victim based on free space loss
Q Minimum separation distance is 2000 ft/0,33 nm (parallel flight trajectories)
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Scenario 1: Test-setupEFIS DME Interrogator Chan 66 X / 133,90 MHz
DSP 86 ARINC Collins DME 900 TX = 1090 MHz429 Po = 59,5 dBm /57,5 dBm
DME Testpanel Pi = -83 dBm
d(1153) = 24,6 dB
Trigger Gen.
ARINC 429 Test
Data Trac 400 Coupler SA Pulse Generator
R&S FASA Video HP 8110 AOut ext. Trig. In
1 Oscilloscope
Circulator LeCroy 9350 AL2 3
MonitorPar Data
d(1090) = 80 dB Trig in
Direct. Coup. Uniline Direct. Coupler Signal Generator
20 dB UAT Simulator
R&S SMIQ 3 1-2 20 dB
20 dB
UAT Monitor
Circulator R&S FSIQ 31 3
2Chan 66 X / 133,90 MHz
TX = 1153 MHz
Signal Generator Pi = 55,7 dBmDME P0 = -80,5 dBm
JCAir SDX 2000 Reff = 70 %Sq. Rate = 2700/3600/5400 PP/S
Range = 10 Nm
test setup:
UAT versus DME
60 dB
Ref Lvl 0 dBm 0 dBmRef Lvl 0 dBm 0 dBm
CF 978 MHzSR 1.04167 MHz
Meas SignalEye [I]
Demod 2FSK
T1
A REAL
0 2SYMBOLS-200m
250m
11
Marker 1 [T1] 0.04 sym Real -125.372 m
Date: 22.NOV.2002 10:07:56
A
1RM
Unit dBmSWT 1 sMixer -20 dBm
RBW 100 kHzVBW 100 kHz
RF Att 0 dBRef Lvl-10 dBmRef Lvl-10 dBm
400 kHz/Center 980 MHz Span 4 MHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-110
-10
1
1
Marker 1 [T1] -21.14 dBm 978.01000000 MHz
Date: 26.NOV.2002 10:32:44
RBW 1 MHz
VBW 1 MHz
A
Unit dBm
TRG
Ref Lvl
-40 dBm
Ref Lvl
-40 dBm
RF Att 10 dB
SWT 500 s
Center 1.153 GHz 50 s/
1VIEW 1MA
-85
-80
-75
-70
-65
-60
-55
-50
-45
-90
-40
TR
Date: 19.FEB.2003 15:22:56
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200312
Scenario 1: Results - sensitivitySettings:Q Channel 66X (1153 MHz)Q BRE = 70 %Q PRF = 2700 ppps
--86,5-88,5-89,5DME 40 -Sensitivity [dBm]
-102,5--101,5-100,5DME 900 -Sensitivity [dBm]
3002501000Distance [nm]
Results:
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Scenario 1: Results – DME 900
DME 900 - ASOP for different interference types (2700 ppps, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - Type a Int @ -83 dBm
ASOP - Type b Int @ -83 dBm
ASOP - Type c Int @ -83 dBm
ASOP - Type d Int @ -83 dBm
DME 900 - BSOP for different interference types (2700 ppps, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - Type a Int @ -83 dBm
BSOP - Type b Int @ -83 dBm
BSOP - Type c Int @ -83 dBm
BSOP - Type d Int @ -83 dBm
Figure 3-1 Figure 3-2
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Dr. Armin Schlereth / CNS/CN 28.05.200314
Scenario 1: Results – DME 900
DME 900 - ASOP impact of ppps (Type d Interferer, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - 2700 ppps @ -83 dBm
ASOP - 3600 ppps @ -83 dBm
ASOP - 5400 ppps @ -83 dBm
DME 900 - BSOP impact of ppps (Type d Interferer, 70%BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - 2700 ppps @ -83 dBm
BSOP - 3600 ppps @ -83 dBm
BSOP - 5400 ppps @ -83 dBm
Figure 3-3 Figure 3-4
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Dr. Armin Schlereth / CNS/CN 28.05.200315
Scenario 1: Results – DME 900
DME 900 - ASOP impact of desired signal level (Type d Interferer, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - 2700 ppps @ -83 dBm
ASOP - 2700 ppps @ -76 dBm
ASOP - 2700 ppps @ -66 dBm
DME 900 - BSOP impact of desired signal level (Type d Interferer, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - 2700 ppps @ -83 dBm
BSOP - 2700 ppps @ -76 dBm
BSOP - 2700 ppps @ -66 dBm
Figure 3-5 Figure 3-6
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200316
Scenario 1: Results DME 900 - Summary• ASOP and BSOP values differ only 1 – 2 dB (BSOP > ASOP)• Figure 3-1/3-2: Impact of different interferer types
Q Co-channel interference behaviour independent of interferer typeQ Type a, b, d: Similar results for first adjacent channelQ Type a, b, d: Type a exploits UAT-RF-mask “better” than Type b and d, therefore
Type a causes poorer DME performance at second adjacent channelQ Type b, d: No impact whether it is continual or bursted interference
• Figure 3-3/3-4: Impact of pppsQ No perceivable sensitivity in the range 2700 to 5400 ppps
• Figure 3-5/3-6: Impact of desired signal level (DSL)Q Linear relation between DSL and ASOP/BSOP values
• No Figure: Impact of BREQ For reference settings (2700 ppps, -83 dBm DSL) and Type d interferer:
Ø ASOP/BSOP values showed no dependency on BRE in the range 30 % to 100%
Ø No stable operating point reached for BRE = 20 % (DUT not specified)
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200317
Scenario 1: Results – DME 40
DME 40 - ASOP for different interference types (2700 ppps, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - Type a Int @ -83 dBm
ASOP - Type b Int @ -83 dBm
ASOP - Type c Int @ -83 dBm
ASOP - Type d Int @ -83 dBm
DME 40 - BSOP for different interference types (2700 ppps, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - Type a Int @ -83 dBm
BSOP - Type b Int @ -83 dBm
BSOP - Type c Int @ -83 dBm
BSOP - Type d Int @ -83 dBm
Figure 3-7 Figure 3-8
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200318
Scenario 1: Results – DME 40
DME 40 - ASOP impact of ppps (Type d Interferer, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - 2700 ppps @ -83 dBm
ASOP - 3600 ppps @ -83 dBm
ASOP - 5400 ppps @ -83 dBm
DME 40 - BSOP impact of ppps (Type d Interferer, 70% BRE)
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - 2700 ppps @ -83 dBm
BSOP - 3600 ppps @ -83 dBm
BSOP - 5400 ppps @ -83 dBm
Figure 3-9 Figure 3-10
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200319
Scenario 1: Results – DME 40
DME 40 - ASOP impact of desired signal level (Type d Interferer, 70% BRE)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
ASOP - 2700 ppps @ -83 dBm
ASOP - 2700 ppps @ -76 dBm
ASOP - 2700 ppps @ -66 dBm
DME 40 - BSOP impact of desired signal level (Type d Interferer, 70% BRE)
-90
-80
-70
-60
-50
-40
-30
-20
-10
0-3 -2 -1 0 1 2 3
UAT Frequency Offset [MHz]
Inte
rfer
ence
Lev
el [
dBm
]
BSOP - 2700 ppps @ -83 dBm
BSOP - 2700 ppps @ -76 dBm
BSOP - 2700 ppps @ -66 dBm
Figure 3-11 Figure 3-12
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200320
Scenario 1: Results DME 40 - Summary• ASOP and BSOP values differ 2 dB and more (BSOP > ASOP)• Figure 3-7/3-8: Impact of different interferer types
Q Type a, b, d: Type d as the only bursted interferer signal provides best DME performance of all three modulated interferer types
Q Type a, b, c: Co-channel behaviour nearly identical for all three continual interfererQ Type a, b: Quite similar DME performance at first adjacent channelsQ Type a, b, d: Type a exploits UAT-RF-mask “better” than Type b and d, therefore
Type a causes poorer DME performance at second adjacent channel
• Figure 3-9/3-10: Impact of pppsQ Perceivable sensitivity in the range 2700 to 5400 ppps only at second adjacent
channel
• Figure 3-11/3-12: Impact of desired signal level (DSL)Q Linear relation between DSL and ASOP/BSOP values
• No Figure: Impact of BREQ For reference settings (2700 ppps, -83 dBm DSL) and Type d interferer:
Ø ASOP/BSOP values showed no dependency on BRE in the range 50 % to 100%Ø At BRE = 40 % DME performance started to degrade with no stable operating point
reached for BRE = 20 % (DUT not specified)
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200321
Scenario 1: Planning criteria
0,026 – 0,04266 - 70““-23““± 2
4,2 – 6,6110 – 114““-67““± 1
52,4 – 83,0132 – 136““-8950 - 54A30
0,01 – 0,01758 – 62““-23““± 2
1,7 – 2,6102 – 106““-67““± 1
20,8 – 33,0124 – 128““-8942 – 46A1H / A20
0,006 – 0,01154,5 – 58,5““-23““± 2
1,1 – 1,898,5 – 102,5““-67““± 1
13,9 – 22,1102,5 – 124,5- 43-8938,5 – 42,5A0 / A1L0
Required distance r
[nm][3]
Required L0[dB]
DME antenna gain
[dBi]2
Cable loss [dB][2]
ASOP interferer level [dBm]
UAT Txpower at antenna [dBm]1
UAT equipment
class[1]
Adj. channel #
DME - 900
[1] According UAT MOPS[2] According ICAO Annex 10, Vol. 1 section 7.2.1 of DME guidance material[3] For fUAT = 978 MHz leading to r[nm] = 1,318 * 10E(-5) * 10E(L0/20)
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Scenario 1: Planning criteria
0,02 – 0,0364 - 68““-21““± 2
4,7 – 7,4111 – 115““-68““± 1
37,1 – 58,7129 – 133““-8650 - 54A30
0,008 –0,013
56 – 60““-21““± 2
1,9 – 2,9103 – 107““-68““± 1
14,8 – 23,4121 – 125““-8642 – 46A1H / A20
0,005 –0,008
52,5 – 56,5““-21““± 2
1,2 – 2,099,5 – 103,5““-68““± 1
9,9 – 15,6117,5 – 121,5- 43-8638,5 – 42,5A0 / A1L0
Required distance r
[nm][3]
Required L0[dB]
DME antenna gain [dBi]5
Cable loss [dB][2]
ASOP interferer
level [dBm]
UAT Txpower at antenna [dBm]4
UAT equipment
class[1]
Adj. channel #
DME - 40
[1] According UAT MOPS[2] According ICAO Annex 10, Vol. 1 section 7.2.1 of DME guidance material[3] For fUAT = 978 MHz leading to r[nm] = 1,318 * 10E(-5) * 10E(L0/20)
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200323
Scenario 2: CE2015
• 2091 aircraft are included (both airborne and ground)
• 5 major TMAs are considered (Brussels, Amsterdam, London, Paris, Frankfurt)
• Each TMA characterised by:Q The inner region (10 nm radius) contains 29 aircraft at lower altitudesQ The outer region (50 nm radius) contains 103 aircraft at mid to higher altitudesQ 25 aircraft on ground (5 nm radius) plus 25 aircraft randomly distributed throughout
the entire scenario area
• Additional enroute aircraft distributed over a circle of 300 nm radius around
Brussels
• Aircraft victim receiver at 37000 ft altitude at centre of scenario above Brussels
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Dr. Armin Schlereth / CNS/CN 28.05.200324
Scenario 2: CE2015 – JHU/APL - data
• JHU/APL provided simulation data withQ Interference power values at DME victim RxQ Dedicated reception time instants
-160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -600
0.01
0.02
0.03
0.04
0.05
0.06
Victim-RX-Power [dBm] ==>
Nor
mal
ized
Den
sity
==>
JHU-APL data
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Dr. Armin Schlereth / CNS/CN 28.05.200325
Scenario 2: CE2015 – data implementation• UAT bursts with random data• UAT bursts with long transmission format only• Calculated 500 UAT bursts are equally distributed over 1 second superframe• Simulated UAT burst load on DME interrogator:
311287-90 … -96
116116-84 … -90
4343-78 … -84
2121-72 … -78
88-66 … -72
11-60 … -66
# of bursts used in WTD81 tests
# of bursts according JHU-APL data
Power level classes [dBm]
• For each power level class always the highest value used• Identical 1 second superframe UAT burst distribution is repeated once a
second• Time jitter of DME signal relative to UAT interference provides sufficient
statistics
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Dr. Armin Schlereth / CNS/CN 28.05.200326
Scenario 2: Measurement Settings
Type b, dUAT modulation scheme
70 % Beacon Reply Efficiency (BRE)
2700Pulse Repetition Frequency (PRF) at the DME beacon [ppps]
1 dB grid; range depends on DUTDME interrogator desired signal input power values [dBm]
0, +1DME channel to interferer channel separation [MHz]
17X (978 MHz)DME channel
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200327
Scenario 2: Interference Criteria
Q Measurement of Time To Acquire (TTA)
Q 20 samples per DSL with maximum TTA of 2 minutes
Q Maximum track time after DME acquired: 5 seconds
Q Measurement started with high DSL value
Q DSL decreased in 1 dB steps until at least in 5 out of 20 samples DME
acquisition was not possible
Q For each DSL mean and standard deviation of TTA calculated
Q Interference is tolerable, when:
µTTA_INT = max (µTTA + 0,5 [s] ; µTTA + 2 · sTTA)
withµTTA_INT : mean value of TTA in seconds, when interference is presentµTTA : mean value of TTA in seconds without interference @ reference DSL (-76 dBm or -83 dBm)s TTA : standard deviation of TTA in seconds without interference @ reference DSL (-76 dBm or -83 dBm)
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200328
Scenario 2: Test - setup
UAT SignalSimulation withHP8791 FASS
HP-UXController
Analyzerhp8560E
PPMGT 8501A
Combiner DME
DME/TACANBeacon Sim.
(DTS200)
DUTInterface
PC
EMC shelter
FASS = Frequency Agile Signal Simulator
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200329
Scenario 2: Results – DME 900DME 900 at 17X (978 MHz) vs. UAT CE2015
0
5
10
15
20
25
30
35
40
-95 -94 -93 -92 -91 -90 -89 -88 -87 -86 -85 -84 -83 -82
DSL [dBm]
TT
A [
s]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
DME 900 at 18X (979 MHz) vs. UAT CE2015
0
5
10
15
20
25
30
35
40
-95 -94 -93 -92 -91 -90 -89 -88 -87 -86 -85 -84 -83 -82
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
Figure 4-1
Figure 4-2
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200330
Scenario 2: Results – DME 42DME 42 at 17X (978 MHz) vs. UAT CE2015
0
5
10
15
20
25
-90 -89 -88 -87 -86 -85 -84 -83 -82 -81 -80
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
DME 42 at 18X (979 MHz) vs. UAT CE2015
0
5
10
15
20
25
-90 -89 -88 -87 -86 -85 -84 -83 -82 -81 -80
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
Figure 4-3
Figure 4-4
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200331
Scenario 2: Results – TCR-451TCR-451 at 17X (978 MHz) vs. UAT CE2015
0
10
20
30
40
50
60
70
80
90
100
-85 -84 -83 -82 -81 -80 -79 -78 -77 -76 -75
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
TCR-451 at 18X (979 MHz) vs. UAT CE2015
0
10
20
30
40
50
60
70
80
90
100
-85 -84 -83 -82 -81 -80 -79 -78 -77 -76 -75
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
Figure 4-5
Figure 4-6
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200332
Scenario 2: Results – KN-65AKN-65A at 17X (978 MHz) vs. UAT CE2015
0
10
20
30
40
50
60
-83 -82 -81 -80 -79 -78 -77 -76 -75
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
KN-65A at 18X (979 MHz) vs. UAT CE2015
0
10
20
30
40
50
60
-83 -82 -81 -80 -79 -78 -77 -76 -75
DSL [dBm]
TT
A [s
]
Mean (UAT OFF)
Mean (UAT ON)
Std. Dev. (UAT OFF)
Std. Dev. (UAT ON)
Figure 4-7
Figure 4-8
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200333
Scenario 2: Summary of results
5,926,961,184,6-76KN-65A
3,496,82,042,72-76TCR-451
3,483,550,053,05-83DME 42
1,181,330,130,83-83DME 900
Measured µTTA_INTat ref. DSL (UAT on) [s]
Max. tolerable µTTA-INT at ref. DSL (UAT on) [s]
s TTA at ref. DSL, UAT off [s]
µTTA at ref. DSL, UAT off [s]
Ref. DSL [dBm]
DME type
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200334
Conclusion
Scenario 1, Criterion 1:DME interrogator receiving frequencies can be assigned to thesecond or higher adjacent DME channel of the UAT frequency 978 MHz
Scenario 2, Criterion 2:DME interrogator receiving frequencies can be assigned to the UATfrequency 978 MHz and the adjacent DME channels.
But:• Scenario 1, Criterion 1 over-estimates interference• Scenario 2, Criterion 2 under-estimates interference
DFS Deutsche Flugsicherung GmbH
Dr. Armin Schlereth / CNS/CN 28.05.200335
Conclusion
Planning criteria for UAT frequency 978 MHz:
The closed assignable DME interrogator receiver frequency Relative to the UAT ADS-B frequency 978 MHz are the first adjacent DME channels.
NOTE: For any other UAT frequency a study on the interference of DME transmissions on UAT victim receiver may be necessary and the proposed rule might not be true. ADS-B scenario is also mentioned explicitly, because Scenario 2 refers to that service only.