rapid evaluation of asw risk john mooreprincipal consultant, corda ltd dave lewisdd(capability),...
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Rapid Evaluation of ASW Risk
John Moore Principal Consultant, CORDA Ltd
Dave Lewis DD(Capability), DEC(UWE)
© CORDA Ltd 2004. All rights reserved
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2
Overview
1 The Need for ASW Risk Assessment
2 Modelling Approach
3 The Dynamic ASW Risk Model (DARM)
4 Current Status & Way Ahead
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1. The Need for ASW Risk Assessment
My concern overall is that we are taking risk on risk’
First Sea Lord (Adm Sir Alan West), August 2004
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The Exam Question
‘A high-level appreciation of the [operational] risk that we are taking in ASW’
– Current and future– Maritime deployment and access– Moderate threat levels
Source: CM(SD), November 2003
(adapted)
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Capability Assessment: ‘Traffic Light’ Output
NB All data shown are hypothetical
2001
2005?
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ASW Risk Assessment
The real-world consequences...
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ASW Risk Assessment
How unlucky was that ?
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Capability and Risk Assessment
Capability Assessment
Spans all capability areas
Includes peacetime and non-warfighting scenarios
Potentially subjective
Capabilities assessed individually
Low resolution
Mission Risk Assessment
Addresses a specific warfare area
Covers only warfighting scenarios
Rigorous and verifiable
Single, coherent assessment of risk
High resolution
Techniques are complementary
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2. ASW Risk - Modelling Approach
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ASW Risk Assessment - The Requirement
Require fast response– rapid processing of large number of options and
sensitivity cases
Flexible and versatile– process spans all types of ASW mission
Scenario-level model– covers full duration of scenario
Maximum use of existing models and data
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ASW Risk Modelling - Generic ASW Campaign
Area ASW
Threat
TG
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ASW Risk Modelling - Solution
Analytic spreadsheet model
‘Level 1’ model – represent ASW encounters with parameterised
encounter rates & outcomes
‘Level 2’ models– screening model– area & barrier search
Draw on legacy data wherever possible
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3. ASW Risk - The Dynamic ASW Risk Model (DARM)
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DARM - Key Concepts
Generic Units– ‘threats’ (hostile) v ‘task units (TU)’ (friendly)– TUs represent both ‘hunters’ and targets
Random encounters– parameterised encounter rates
Scenario evolves with time– campaign divided into up to 8 periods– assets can arrive, leave or change mission at start of
each period
Up to 8 Analysis Cases in one application
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DARM - Example Scenario
Blue– CVBG arrives D+7– RoRo (unescorted) arrives every 2 days from D+7– ASW TG does precursor ops to D+6, then joins CVBG– MPA search from D+0
Red– SSK 1 on station until D+13– SSK 2 on station from D+7– tasked against both CVBG and RoRo vessels
variant: RoRo vessels only
NB All data shown are hypothetical
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DARM - Measures of Effectiveness
Each MoE measures losses to a different combination of TU types
‘Critical loss level’ defined for each MoE– risk defined as probability of losses equalling or exceeding critical loss
level
NB All data shown are hypothetical
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DARM - Level 2 Screening Model
Encounter
Threat detects with advantage TU detects with advantage
TUevades
TU does not evade
Threat classified before FCS
Threatattacks
Threatprosecuted
Threatkilled
Torpedo defence
Threatescapes
Threatlocalised
TU losses
Threatattacks
Torpedo defence
TU losses
Threatkilled
Threat killedafter attack
Threatescapes Threat killed
after attackThreat
escapes
Threat localised
Threatprosecuted
Threat not classifiedbefore FCS
Threatescapes
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DARM Output: Analysis Case Results
‘Kinks’ in the loss curves are due to arrivals and departures of threats and TUs
NB All data shown are hypothetical
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DARM Output: Risk Table
NB All data shown are hypothetical
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DARM Output: Risk Chart
Critical risk level
NB All data shown are hypothetical
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DARM - Verification & Validation
Verification by QineiQ Ltd (January 2004)– mathematical correctness– response properties
Validation issues:– key assumptions embedded in data– data drawn mainly from COEIA/Business Cases– Data & Assumptions review in preparation
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4. Current Status and Way Ahead
DARM demonstrates real-world impact of savings and
enhancement options
Initial applications:
– Risk assessments for high-level decision-making
– ASW concepts studies
Plans:
– complete Level 2 models
– create Data & Assumptions paper
– Cap Audit validation
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Rapid Evaluation of ASW Risk
End of Presentation
© CORDA Ltd 2004. All rights reserved