Cornell SHOT-II Post-Flight DebriefingSHOT-IISunday, June 18, 2006

Adam MaherJohn Honchariw

Mechanical Systems EngineerCUSat Satellite Project

Nanosat-4 Program Sponsors

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Presentation Guide

Mission Overview

CUSat High Altitude Test (CHAT) Takes 25 pictures of adjacent SHOT-II Package Use Photomodeler-5 software package

Distance verification Accelerometer data asses versatility of algorithm

Mission Overview

Mission Relevance

CHAT Design

CHAT Testing

Expected Results

Demonstration

Release

Initial Photo, 10 minutes

Photos @ 3.5 min

Balloon BurstAll Pictures Taken Enter Stand-

by Mode

Landing & Data Retrieval

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Expected Results(1 of 3)

Expected Results Raw Image Data Software Reconstruction 3-D CAD Model

Actual Results

Conclusions

Actions

Distance verification photo: Camera placed 43 inches away

3D model photos:

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Expected Results(2 of 3)

Computed distance: 42.526 inches

Expected Results Raw Image Data Software Reconstruction 3-D CAD Model

Actual Results

Conclusions

Actions

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Expected Results(3 of 3)

Expected Results Raw Image Data Software Reconstruction 3-D CAD Model

Actual Results

Conclusions

Actions

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Results: Image Data(1 of 4)

Expected Results

Actual Results Raw Image Data Choose Vertices Software Reconstruction Measurements

Conclusions

Actions

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Results(2 of 4)

Expected Results

Actual Results Raw Image Data Choose Vertices Software Reconstruction Measurements

Conclusions

Actions

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Results(3 of 4)

Expected Results

Actual Results Raw Image Data Choose Vertices Software Reconstruction Measurements

Conclusions

Actions

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Results(4 of 4)

Both images contained same information Less data on z-axis, which means more error in

solution

Truth Data String 107 inches placement

Computed Value 113.482 inches

Error Cable elasticity +/- 5 inches

Also may be temperature dependent Lens focal point +/- 1 inch 2D error +/- 1 inch

Accelerometer Data was not gathered correctly

Expected Results

Actual Results Raw Image Data Choose Vertices Software Reconstruction Measurements

Conclusions

Actions

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Conclusions Data provides centimeter-level accuracy

Inconclusive on sub-centimeter level Need to test with fewer variables involved

Software & ground operations “Dress Rehearsal” Full crew in Ithaca for analysis Greater familiarity with software

Camera focal point Important variable to measure Improves measurement accuracy

Characterization of ‘Good Image’ See three axes of information

2D creates greater measurement error Relative movement not as much of an issue

Expected Results

Actual Results

Conclusions

Actions

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Actions

Camera focal point Need to know this information with

respect to the body frame Important variable in achieving sub-

centimeter level accuracy

Measurement accuracy must be retested Greater control in the experiment Take pictures that have 3 axes with of

information

Expected Results

Actual Results

Conclusions

Actions

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Questions

Expected Results

Actual Results

Conclusions

Actions