Small satellite engineering in a box
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SMALL SATELLITE ENGINEERING IN A BOX ________________________. THE EYASSAT CONCEPT OF EDUCATING ASSEMBLY, INTEGRATION AND TEST PROCEDURES FOR UNDERGRADUATE SPACECRAFT DESIGN CLASSES. DEPARTMENT OF ASTRONAUTICS 20 APRIL 2004. OBADIAH NG RITCHEY. OVERVIEW. WHAT WE DO EYASSAT CONCEPT

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SMALL SATELLITE ENGINEERING IN A BOX ________________________

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Small satellite engineering in a box

SMALL SATELLITE ENGINEERING IN A BOX________________________

THE EYASSAT CONCEPT OF EDUCATING ASSEMBLY, INTEGRATION AND TEST PROCEDURES FOR UNDERGRADUATE SPACECRAFT DESIGN CLASSES


Department of astronautics 20 april 2004

DEPARTMENT OF ASTRONAUTICS

20 APRIL 2004

OBADIAH NG RITCHEY


Overview

OVERVIEW

  • WHAT WE DO

  • EYASSAT CONCEPT

  • DIFFERENTIATING EYASSAT: PROMOTING ‘RESPONSIVE SPACE’

  • WHAT I HAVE ACCOMPLISHED

  • IDEAS FOR THE FUTURE

  • ACKNOWLEDGEMENTS AND REFERENCES


What we do usafa ssrc

WHAT WE DO (USAFA & SSRC)

  • CAPSTONE DESIGN COURSES:

     FalconSAT

     FalconLAUNCH

  • REAL DOD SCIENCE AND PAYLOADS

  • ONLY UNDERGRADUATE ASTRONAUTICS PROGRAM


Eyassat concept intro

EYASSAT CONCEPT INTRO

  • EYASSAT CREATED IN PART OF A REVAMPED A331 CURRICULUM

  • STUDENT EMPHASIS ON QUALIFICATION AND TESTING

  • SHADOWS THE ‘REAL AIR FORCE’

  • ALLOWS FOR DEMONSTRATION AND EXPERIMENTATION OF A ‘REAL’ SPACE SYSTEM AT A FRACTIONAL COST


Eyassat concept intro1

EYASSAT CONCEPT INTRO

  • CONCEPT NOT USED BEFORE FOR AEROSPACE UNDERGRADUATE OR POSTGRADUATE STUDIES

  • CONCEPT ALLOWS FOR EXTREMELY FLEXIBLE LABORATORY EXPERIENCES


The eyassat stack

THE EYASSAT STACK


Eyassat classroom process

EYASSAT CLASSROOM PROCESS


Differentiating eyassat

DIFFERENTIATING EYASSAT

  • EYASSAT IS MEANT FOR EDUCATION—NOT SPACE

  • EYASSAT HAS GREATER CAPABILITY (ADACS, SIZE, DECENTRALIZED COMPONENT OPERATION, INTEROPERABILITY, ‘PLUG-AND-PLAY’ HOT-SWAPPABLE MODULES)

  • DATA BUS MUCH MORE FLEXIBLE AND REDUNDANT

    (STAR VS SHARED ‘CAN-BUS’)


Differentiating eyassat1

DIFFERENTIATING EYASSAT

  • INTEGRATION ASPECTS NOT YET REALIZED (NATURE OF PROJECT)

  • SUBASSEMBLIES EASILY REPLACED

  • ELECTRICAL AND STRUCTURAL DESIGN ARE MORE INDEPENDENT

  • POWER AND UMBILICAL

  • MECHANICAL SIZE/COMPLEXITY

  • PAYLOADS (TYPE AND VOLUME AVAILABLE)


Differentiating eyassat2

DIFFERENTIATING EYASSAT

  • SHOCK, VIBE, THERMAL TESTING NOT

    YET IN THE PICTURE 

  • COMPONENT, SYSTEM-LEVEL AND FUNCTIONAL TESTS ARE!

  • CONFORMAL COAT/STAKING NOT UTILIZED

    (REUSABILITY ASPECT)

  • COMMERCIAL INTERESTS

  • CUBESAT ATTEMPTS TO DO ‘FALCONSAT’ WITH ‘EYASSAT’ PARTS AND BUDGET


Differentiating eyassat3

DIFFERENTIATING EYASSAT

  • EYASSAT DEMONSTRATES HOW THE SYSEMS INTERACT WHILE BEING ABLE TO CARRY OUT A ‘MISSION’

  • THE OPERATION IS HANDS-ON, THE BUILDING IS NOT

  • EYASSAT HAS THE POSITIVE QUALITIES OF BOTH NANO- AND PICOSATS WHILE BEING RELIABLE AND EASILY RECONFIGURABLE


What i have accomplished

WHAT I HAVE ACCOMPLISHED

  • 0th AND 1st ORDER NOMINAL I-V AND I-P CURVE SOLAR ARRAY CHARACTERIZATION

  • COMMUNICATION AND BATTERY MODULE PRODUCTION—LATER USED BY THE STUDENTS

  • A331 LABORATORY EXPERIENCE—AT MY OWN PACE AND DEPARTING FROM STUDENT LESSONS

  • RESEARCH THE OTHER ‘DOES SPACE’ UNIVERSITY PROGRAMS FOR COMPARISON


What i have accomplished1

WHAT I HAVE ACCOMPLISHED

  • COMPLETE ADDITIONAL BASELINE DATA TO AID IN ACCEPTANCE TESTS

  • PRODUCE NOMINAL CHARACTERIZATION DATA FOR ADCS USE—FOCUSING ON ENVIRONMENTAL VARIABLES


Solar array performance

SOLAR ARRAY PERFORMANCE


Solar array performance1

EyasSAT Solar Array IV Curve

0.35

1.6

1.4

0.3

1.2

0.25

1

0.2

I vs V

Current (mA)

0.8

P vs V

0.15

0.6

0.1

0.4

0.05

0.2

0

0

0

2

4

6

8

10

12

14

Voltage (V)

SOLAR ARRAY PERFORMANCE


Adcs position sensor testing arrangement

ADCS POSITION SENSOR TESTING ARRANGEMENT


Adcs position sensor readings

ADCS POSITION SENSOR READINGS


Adcs position sensor readings1

ADCS POSITION SENSOR READINGS


Ideas for the future

IDEAS FOR THE FUTURE

  • GPS

  • DIGITAL IR AND VISIBLE SPECTRUM

    IMAGING

  • TARGET TRACKING

  • PROX-OPS ON AIRTABLE (THINK: SPACE ‘BATTLEBOTS’)

  • COMPOSITE STRUCTURES

  • COLD-GAS PROPULSION MODULE


Acknowledgements and references

ACKNOWLEDGEMENTS AND REFERENCES

  • DFAS, ESPECIALLY CAPT BARNHART

  • MR JIM WHITE, CSS

  • SCHAFFNER, CALPOLY PAPER AUTHOR

  • WERTZ AND LARSON, SMAD, ETC.

  • TWIGGS, STANFORD’S SSDL

  • GUPTA, ANUSAT LEAD, ISRO


For more information

FOR MORE INFORMATION…

WWW.EYASSAT.COM


Small satellite engineering in a box

QUESTIONS?


Demonstration

DEMONSTRATION


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