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

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Typical Guided Projectile Development Team

Projectile Designers

Aerodynamics Experts

GN&C Designers

Systems SimulationExperts

Data Data

Data Data

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Lean (and Agile) Concept

Standardize on a validated toolset

Eliminate waste and add value

Streamline the process

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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

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Example Walk Through

Design a retrofit fuze to guide 81mm Mortar

Trade off control mechanismsTrade off sensor options

EvaluationRange extensionCEP

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Build the Model

Multiple optionsBuild from scratch (1hr)Modify existing (5 min)Projectile Tracing Tool (15 min)Import via DXF or IGES (30 min)

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Estimate Aerodynamics

Multiple EstimatorsSpinner by Arrow TechFinner based on DeJongeMissile DATCOMMISL3 by NearAP98 by NSWC

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Evaluate Aero Stability

Stability EvaluationBaseline Static Margin 1.3 calibersWith canards 0.45 calibers

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Evaluate Control AuthorityUse CONTRAJ Module(Controlled Trajectory)

Trade off Squibs versus Canards

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Control Authority Results for this Example

Squibs at this locationLots of MotionSmall lateral movement

Canards50% more rangeTremendous control authority

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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

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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

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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

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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

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Example Systems

GPS guided Seeker guided

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ScriptDriven

Iterations

Guided System Effectiveness Simulation

Fly Guided Trajectory

Store Impacts

GenerateIC set

Tune GN&C

EvaluateResults

Error Budget

Report theResults

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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

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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

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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

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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

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Ballistic Impacts

-500

-300

-100

100

300

500

6500 6700 6900 7100 7300 7500 7700

Range

Cro

ss R

ange

Glide OnlyTarget

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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

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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

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Results from our ExampleRange km CEP m

Ballistic 5.1

7

7

7

96

Ballistic with Glide

106

Seeker Guided 68

GPS Guided 16

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Questions ?