Crystal Oscillators as Frequency References in a Rocket

Overview � Introduction � Theory � Design � Testing � Future Work

Introduction � Measuring how the rocket flight affects oscillators � Oscillators drive processors and

Theory � Crystal Oscillators are mechanical devices ◦ Forces change their properties � Analyzing

Requirements � Wallops Compliance ◦ No power to circuit before launch ◦ No radio

Design � Parts and why we chose them � Block Diagram � Schematic

Brief Parts List Qty Supplier Part Number Description 5 AD 734 BN-ND 2 Boards

Software � Space OS ◦ Abstracts the software from the hardware ◦ Portable �can

Testing � Bread Board testing � Voltage test at every node � Oscillator Frequency

Results � Reference Oscillator: � X-plane Oscillator: � Y-plane Oscillator: � Z-plane Oscillator: �

Future Work � SD Card Code � Signal Tuning ◦ Op-Amps � Board revision

Conclusion � Introduction � Theory � Design � Testing � Future Work

Slides: 21

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Crystal Oscillators as Frequency References in a Rocket James C. Richey Justin R. Thornton Department of Electrical and Computer Engineering University of Wyoming

Overview � Introduction � Theory � Design � Testing � Future Work

Introduction � Measuring how the rocket flight affects oscillators � Oscillators drive processors and communication equipment � Looking for changes in frequency � Project will take flight in June

Theory � Crystal Oscillators are mechanical devices ◦ Forces change their properties � Analyzing data ◦ Fourier Transform ◦ Spectrogram � Product to sum equation ◦ modulation

Requirements � Wallops Compliance ◦ No power to circuit before launch ◦ No radio communications � Fit project on 9 in diameter tray � Mixing Signals � Sample output of LPF’s � Store the Data

Design � Parts and why we chose them � Block Diagram � Schematic

Brief Parts List Qty Supplier Part Number Description 5 AD 734 BN-ND 2 Boards 1 Milar Sheet 5 VM 14 E 6 1 Multiplier PCB 2 -layer Reflow solder mask Crystal Oscillators MAX 7426 EUA+-ND LPF MC 9 S 12 XDP 512 MALND Microcontroller Supplier Price per Unit Total Price Digikey $35. 79 $178. 95 Advanced $148. 91 Polulu $85. 00 Mercury $115. 00 $575. 00 Digikey $3. 26 $19. 56 Digikey $17. 39 Grand Total $1, 024. 81

Functional Block Diagram

Main Board - Digital

Main Board - Analog

Vertical Board

Power Board

Software � Space OS ◦ Abstracts the software from the hardware ◦ Portable �can be used on different hardware ◦ Expandable �New features can be added ◦ FAT 16 / FAT 32 support

Space OS

Testing � Bread Board testing � Voltage test at every node � Oscillator Frequency test ◦ 1952 A Digital Counter Timer by FLUKE

Results � Reference Oscillator: � X-plane Oscillator: � Y-plane Oscillator: � Z-plane Oscillator: � Observation: 10. 000_001_1 MHz 10. 000_024_3 MHz 10. 000_015_4 MHz 10. 000_031_6 MHz ◦ Introduced vibrations resulted in frequency change

Finished Project

Oscillators and Mixers

Future Work � SD Card Code � Signal Tuning ◦ Op-Amps � Board revision

Conclusion � Introduction � Theory � Design � Testing � Future Work

Questions