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NDIA Guns & Missiles 2008 1If you Can't Get a Bigger Target...
Lean (and Agile) System Simulation
of Guided Projectilesin the Early Development Stage
Mark Steinhoff
mark@prodas.com802 865-3460 ext 18
WWW.PRODAS.COM
NDIA Guns & Missiles 2008 2If you Can't Get a Bigger Target...
Typical Guided Projectile Development Team
Projectile Designers
Aerodynamics Experts
GN&C Designers
Systems SimulationExperts
Data Data
Data Data
NDIA Guns & Missiles 2008 3If you Can't Get a Bigger Target...
Lean (and Agile) Concept
Standardize on a validated toolset
Eliminate waste and add value
Streamline the process
NDIA Guns & Missiles 2008 4If you Can't Get a Bigger Target...
Characteristics of the Toolset
Easy to use with common interface
Seamless data flow between applications
Industry standard algorithms to provide confidence in the results
Easy to extract results for proposal support
NDIA Guns & Missiles 2008 5If you Can't Get a Bigger Target...
Example Walk Through
Design a retrofit fuze to guide 81mm Mortar
Trade off control mechanismsTrade off sensor options
EvaluationRange extensionCEP
NDIA Guns & Missiles 2008 6If you Can't Get a Bigger Target...
Build the Model
Multiple optionsBuild from scratch (1hr)Modify existing (5 min)Projectile Tracing Tool (15 min)Import via DXF or IGES (30 min)
NDIA Guns & Missiles 2008 7If you Can't Get a Bigger Target...
Estimate Aerodynamics
Multiple EstimatorsSpinner by Arrow TechFinner based on DeJongeMissile DATCOMMISL3 by NearAP98 by NSWC
NDIA Guns & Missiles 2008 8If you Can't Get a Bigger Target...
Evaluate Aero Stability
Stability EvaluationBaseline Static Margin 1.3 calibersWith canards 0.45 calibers
NDIA Guns & Missiles 2008 9If you Can't Get a Bigger Target...
Evaluate Control AuthorityUse CONTRAJ Module(Controlled Trajectory)
Trade off Squibs versus Canards
NDIA Guns & Missiles 2008 10If you Can't Get a Bigger Target...
Control Authority Results for this Example
Squibs at this locationLots of MotionSmall lateral movement
Canards50% more rangeTremendous control authority
NDIA Guns & Missiles 2008 11If you Can't Get a Bigger Target...
RecapMade two models based on an existing model
Predicted the aerodynamics with three prediction codes
Assessed aero stability of the modified shapes
Evaluated control authority of squibs and canards
Down selected the canard design
Total time invested up to this point ~ 2 hours
NDIA Guns & Missiles 2008 12If you Can't Get a Bigger Target...
Next Step - Simulation
Trajectory Codes
System Effectiveness Simulation
0200400600800
10001200140016001800
0 300 600 900 12001500180021002400270030003300360039004200450048005100540057006000630066006900
Z (m
)
Slant (m)Apr 09,2008Prodas2000 V3 Arrow Tech Associates
GLIDE OFF15 GLIDE OFF20GLIDE OFF25 GLIDE OFF30GLIDE OFF35 GLIDE OFF40
NDIA Guns & Missiles 2008 13If you Can't Get a Bigger Target...
The GN&C Prototype Module
Fully integrated 6DOF/GN&C Simulation
Control with canards, squibs or generic forces
Short learning curve w/ drag/drop FCS editor
Control system can be coded in C or FORTRAN and linked at run time
NDIA Guns & Missiles 2008 14If you Can't Get a Bigger Target...
Why use the GN&C Prototype Tool
Validated 6DOF that runs in real time or fasterIntimately linked to the other toolsPre-built library of common projectile sensors and control surfacesVisualization modules can quickly produce reasonable marketing or training visuals
NDIA Guns & Missiles 2008 15If you Can't Get a Bigger Target...
Example Systems
GPS guided Seeker guided
NDIA Guns & Missiles 2008 16If you Can't Get a Bigger Target...
ScriptDriven
Iterations
Guided System Effectiveness Simulation
Fly Guided Trajectory
Store Impacts
GenerateIC set
Tune GN&C
EvaluateResults
Error Budget
Report theResults
NDIA Guns & Missiles 2008 17If you Can't Get a Bigger Target...
Initial Conditions Generator Module
Generate error deltas from the error budget
Delta plus nominal provide IC’s for all of the subsequent runs
Reality checked with ballistic projectile
NDIA Guns & Missiles 2008 18If you Can't Get a Bigger Target...
Build an Automation Script
Macro script languageBased on Visual Basic (EXCEL)Projectile extensions added
Build OptionsHand CodeUse Analysis Bot module
Output text results file or cross plots
NDIA Guns & Missiles 2008 19If you Can't Get a Bigger Target...
RecapBuilt Models & Estimated Aeros 2 hours
Designed GN&CGPS (modified existing) 2 hoursSeeker (new) 8 hours
Developed Error budget and IC set 2 hours
Modified existing scripts 1 hour
Ran Systems simulations 1 hour
Total time invested up to this point ~ 16 hours
NDIA Guns & Missiles 2008 20If you Can't Get a Bigger Target...
ConclusionsIt is possible to streamline the early stage development of a guided projectileTools need to be integrated and inclusiveSystem effectiveness comparisons of configuration changes as well as guided projectile performance can be evaluated in a timely manner, using readily available tools.Design the projectiles – NOT THE TOOLS
NDIA Guns & Missiles 2008 21If you Can't Get a Bigger Target...
Ballistic Impacts
-500
-300
-100
100
300
500
6500 6700 6900 7100 7300 7500 7700
Range
Cro
ss R
ange
Glide OnlyTarget
NDIA Guns & Missiles 2008 22If you Can't Get a Bigger Target...
Ballistic and Seeker Guided Impacts
-500
-300
-100
100
300
500
6500 6700 6900 7100 7300 7500 7700
Range
Cro
ss R
ange
Glide OnlySeekerTarget
NDIA Guns & Missiles 2008 23If you Can't Get a Bigger Target...
Ballistic, Seeker and GPS Guided Impacts
-500
-300
-100
100
300
500
6500 6700 6900 7100 7300 7500 7700
Range
Cro
ss R
ange
Glide OnlySeekerGPSTarget
NDIA Guns & Missiles 2008 24If you Can't Get a Bigger Target...
Results from our ExampleRange km CEP m
Ballistic 5.1
7
7
7
96
Ballistic with Glide
106
Seeker Guided 68
GPS Guided 16
NDIA Guns & Missiles 2008 25If you Can't Get a Bigger Target...
Questions ?
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