Analyzing Trajectory

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Analyzing Trajectory Attitude Profiles in a
Custom Coordinate Frame

• Arianne Liepa
• Application Engineer/Training
• February 9, 2006

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Agenda

• Complex geometries in mission analysis
• Proximity operations
• Platform attitudes
• Sensor targeting
• Plug-In and template capabilities
• Other areas of applicability
• Question Answer

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Why custom geometries?

• Fundamental analyses
• Where am I?
• What direction is that?
• How far away is that?
• Geometry types
• Standard
• Custom

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STK Vector Geometry Tool (VGT)

• VGT building blocks
• Vectors
• Coordinate frames
• Planes
• Compute, analyze, report, display

• Angles
• Points
• Axes

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VGT Illustrations

• Proximity operations
• Coordinate system
• Relative position vectors
• Platform attitudes
• Custom targeting
• Custom fixed attitudes
• Sensor targeting
• Custom pointing schedules

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Proximity operations

• Formation flying
• Satellite-centered frame
• Time-varying relationships
• Custom geometries
• Constellation frame
• Satellite attitudes
• Satellite relationships

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Model proximity in STK

• Coordinate frame
• Satellite formation
• Centered on satellite
• Relative axes
• Relative positions
• Direction
• Magnitude

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Solution using STK
Custom coordinate system using VGT
1. Custom coordinate system with CenterSat as
center
2. Coordinate system for orbiting satellites
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Solution using STK
Create Vectors using VGT
2. Display vectors in the 3D window
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Custom satellite attitude in STK

• Custom vectors and axes
• Targeting attitude
• Custom pointing vector
• Custom fixed attitudes
• Align and constrain

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Solution using STK
Custom attitude using VGT
2. Satellite attitude references custom vectors

• 1. Satellite pointing references custom vectors

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Custom airborne sensor

• Custom targeting sensors
• Custom vectors
• Custom axes

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Solution using STK

• Create custom vectors and axes using VGT

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Analytical output

• Reports, graphs, and dynamic displays

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Further customization using Plugins

• Plugin highlights
• Custom scripts
• Analysis and visualization
• Matlab, Perl, VBScript

Select the file here
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Poll question

• Please take a moment to fill out our poll
• Do you currently use any of the STK Plugin
  capabilities below?
• Select all that apply. 
• Vector Plugins
• Constraint Plugins
• Communication Plugins
• Other Plugin options (HPOP, Engine models)
• No, I have never used Plugins

Use WebEx to submit your answers
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VGT templates

• Reuse geometries
• Define for object types
• Apply to any object of that type

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VGT in other applicable areas

• Astrogator
• New capability in STK 7
• Missile objects
• Launch coordinate systems
• Ground vehicles
• Range vectors to objects
• Radar
• Radar pointing vectors

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Summary

• Geometry is important!
• Custom geometries required for
• Proximity operations
• Platform attitude
• Sensor targeting
• STK with VGT is an out of the box solution
• Building block architecture
• Flexible
• Extensible

• Launch coordinate systems
• Range vectors to objects

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Questions?

• Please go to the
• WebEx Events Manager
• to submit your question.
• For additional resources, go to
• www.agi.com/webinars
• AGI (toll-free domestic) 1.800.220.4785
• AGI (outside the US and Canada) 1.610.981.8000
• Ask for Sales Manager, Greg Dermond

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Thank you for attending

• AGI (toll-free domestic) 1.800.220.4785
• AGI (outside the US and Canada) 1.610.981.8000
• Ask for Sales Manager, Greg Dermond