2.5
Objectives
............................. 30

3
Current
and
Emerging
Technologies
33
3.1
Introduction............................ 33

3.2
DataValidationandCorrection
................. 34

3.2.1
CorrectionofSpeedVariations. . . . . . . . . . . . . . 35
3.2.2
General
Contextual
Correction
. . . . . . . . . . . . . 36
3.2.3
Epicyclic
Frequency
Separation
. . . . . . . . . . . . . 36
3.3
FeatureExtraction
........................ 37

3.3.1
ConditionIndicators
................... 37

3.3.2
StationarityIndicators
.................. 42

3.3.3
Modeling
......................... 42

5

3.4
Classi.cation
........................... 43

3.4.1
ThresholdTesting..................... 43

3.4.2
Clustering
......................... 45

3.4.3
Feedforward
Networks
and
Fuzzy
Logic
.
.
.
.
.
.
.
.
.
46
3.4.4
Prognosis
......................... 46

3.5
CommercialSolutions....................... 47

3.5.1
IHUMS
.......................... 47

3.5.2
NorthSeaHUMS..................... 47

3.5.3
EuroHUMS
........................ 48

3.5.4
GenHUMS......................... 48

3.5.5
IMDHUMS........................ 48

3.5.6
T-HUMS.......................... 49

3.6
M’ARMSandEuroARMS
.................... 49

3.6.1
AirborneSegment..................... 49

3.6.2
GroundSegment
..................... 50

3.6.3
DecisionFlow
....................... 52

3.6.4
ImprovementPotential
.................. 52

3.7
AxisofResearch
......................... 57

4
Data
Migration
59
4.1
Introduction............................ 59

4.2
AnalysisProcess
......................... 59

4.3
ArchitecturalLayers
....................... 61

4.4
CommonStorage
......................... 62

4.5
DiscrepancyReporting
...................... 63

4.6
Bene.ts
.............................. 64

4.7
Conclusion............................. 65

5
Data
Correction
67
5.1
Introduction............................ 67

5.2
Modeling.............................. 68

5.3
IndicatorCorrection
....................... 69

5.4
SignalCorrection
......................... 72
　
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