ChipSat Talk

Transcript

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   CENTIMETER-SCALE SPACECRAFT Zachary Manchester Space Systems Design Studio Cornell University

   (Currently at NASA Ames)
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   WHAT ARE WE TALKING ABOUT? 2

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   WHAT ARE WE TALKING ABOUT? 3 Printed Circuit Board 3.8

   cm x 3.8 cm x 3mm A = 14.4 cm2 m = 8 gm A/m = 1.8 cm2/gm Depackaged Components on Silicon 1.7 cm x 1.7 cm x 350 µm A = 2.89 cm2 m = 220 mg A/m = 13.1 cm2/gm System on Chip 1.0 cm x 1.0 cm x 25µm A = 1.0 cm2 m = 7.5 mg A/m = 133 cm2/gm
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   •  Where we’ve been •  What we’re working on now

   •  Where we’re heading CHIPSAT HARDWARE 4
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   WHERE WE’VE BEEN Solar Cells Microcontroller Radio Chip Antenna 3.8

   cm Energy Storage Capacitor DC-DC Power Converter 5
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    WHAT WE’RE WORKING ON NOW… 10

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    WHAT WE’RE WORKING ON NOW… 11

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    That’s Us!

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    None
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    None
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    THE FUTURE… Solar Cells Radio Passive Components Microcontroller GPS Receiver

    Battery Dipole Antenna 15
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    •  Spacecraft scaling and dynamics •  Strength in numbers • 

    Mission concepts WHAT CAN WE DO WITH CHIPSATS? 16
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    SPACECRAFT SCALING 17 Symbol Meaning AD Aerodynamic Drag EC Eddy

    Current Drag GG Gravity Gradient GR General Relativity LZ Lorentz Force M Magnetism MT Magnetism - Torquer MR Magnetism – Residual Field Moon Lunar Gravity OB Earth Oblateness PA Planetary Albedo PC Particle Collisions PL Solar System Planetary Gravity PR Poynting-Robertson Drag SP Solar Pressure SR Special Relativity SW Solar Wind Sun Solar Gravity g Characteristic Length
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    CHIPSAT DYNAMICS 18

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    SOLAR SAILING 19

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    LORENTZ AUGMENTED ORBITS 20

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    PLASMA CHARGING EFFECTS 21 -100 V ~ 0V I+ e-

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    ATMOSPHERIC DRAG 23 8 cm! Aluminized CP-1! UHF center-fed dipole!

    1 x 1 x 0.01 cm satellite-on-chip! ~ adrag = A m 1 2 Cd⇢v2ˆ v
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    ATMOSPHERIC ENTRY 24

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    STRENGTH IN NUMBERS 25

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    PROBABILITY OF SUCCESS Series Components Probability of Success 26

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    A NEW PARADIGM Probability of Success Number of ChipSats 27

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    •  Don’t think about individual ChipSats •  Manage the statistics

    of the cloud •  Use little or no closed-loop control •  Take advantage of environmental effects HOW DO WE PLAN MISSIONS? f(qi, ˙ qi, t) @f @t + @f @qi ˙ qi + @f @ ˙ qi ¨ qi = 0 28
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    QUESTIONS? 29