dat/sen april 21, 2006 1 optimising fighter pilot survivability lars rosenberg randleff ph.d....
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1DAT/SENApril 21, 2006
Optimising Optimising Fighter Pilot Fighter Pilot SurvivabilitySurvivability
Lars Rosenberg RandleffLars Rosenberg Randleff
Ph.D. studentPh.D. student
Danish Defence Research EstablishmentDanish Defence Research Establishment
2DAT/SENApril 21, 2006
Rationale
• Numbers of threats, guidance methods, and countermeasures are increasing• 650 missile systems developed• 200-300 missile systems currently deployed
(http://missile.index.ne.jp)
• Not easy to find the best action• Takes training to do it in time• Solution depends on mission
• “The worlds best pilot as the co-pilot”• A work in progress…
3DAT/SENApril 21, 2006
Challenges
• Lack of information• Both in flight and in development
• Information may be self-contradictory• Onboard systems may be wrong
• Best solution depends on a lot of parameters• Avionics, route, scenario, inventory, …
• Should be found in real-time
4DAT/SENApril 21, 2006
Missile Guidance
Semi-active Radar
Infrared
Electro-Optical
Active Radar
Track-Via-Missile
INS/GPS
Command
Beam Rider
Anti-Radiation
5DAT/SENApril 21, 2006
Scenario
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
x 104
0
0.5
1
1.5
2
2.5
3
3.5
4x 10
4
6DAT/SENApril 21, 2006
Parameters
α
ρ
7DAT/SENApril 21, 2006
Lethality
-1 0 1 2 3 4 5
x 104
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4x 10
4
-1 0 1 2 3 4 5
x 104
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4x 10
4
0 50 100 150 200 250 300 350 400 450 5000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Scenario Lethality
8DAT/SENApril 21, 2006
Countermeasures
• Jammer• Emits RF radiation• Very “loud”
• Towed Decoy• A towed jammer• Use once only• Limited resource
• Chaff• Forms a cloud with
a RCS comparable to that of the aircraft
• Limited resource
9DAT/SENApril 21, 2006
Reduction of Lethality (α)
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Reduction of Lethality (ρ)
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Highest Reduction
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
x 104
0
0.5
1
1.5
2
2.5
3
3.5
4
x 104
None Jammer Chaff Decoy
12DAT/SENApril 21, 2006
Building a Mathematical Model
tot
iii
iiii
N
iiitot
LS
RRR
MTRLTPL
1
)),,,(1()(
,,
1
n
ttprod
tt
best
n
ttsum
SS
SS
SS
0
0
}{max
13DAT/SENApril 21, 2006
Decision Schedule
Jammer
Decoy
Chaff
14DAT/SENApril 21, 2006
Changing Mode
15DAT/SENApril 21, 2006
Other Constraints
• The towed decoy can be used a limited number of times (~3)
• Chaff can be dispensed a limited number of times (~30)
• No countermeasure should be chosen, if none is needed
16DAT/SENApril 21, 2006
Concluding Remarks
• Is it better to look ahead? How much?
• Can calculations be done fast enough? What should be the timeframe?
• Does uncertainty make a difference?