Christian Zempel Eric Stackpole Gavin Hagiwara Xander Wroblewski Department of Mechanical...
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Transcript of Christian Zempel Eric Stackpole Gavin Hagiwara Xander Wroblewski Department of Mechanical...
Christian ZempelEric Stackpole
Gavin HagiwaraXander Wroblewski
Department of Mechanical Engineering
IRIS-VIEWS
SHOT II 6/11/10
Verification of In-flight Environmental Wear on Subsystems
Mission Overview
• Purpose– The purpose of this experiment is to
test and verify the performance of several key subsystems that will be used on Santa Clara University’s IRIS nanosatellite.
– Monitoring satellite in near space conditions: altitude, temperature, and pressure
• AVR sats– Custom built multi-purpose
microcontrollers that will be used on IRIS
– Send in-flight temperature and current data
– Packets received versus Packets sent
• Beacon– Similar antenna and ground plane
characteristics and link budget to that of IRIS
– Measuring signal strength
Structural Design
• Main Components– ¼ inch Foam Core Poster
Board– ¼ inch Packing Foam– Acrylic Baseplate– Screen Material– Hot Glue– Aluminum Tape– Tape Measure– Velcro/Adhesive fasteners
• Assembly and Design Process– Measured, cut, and
assembled outer structure– Coated each wall with two
layers of packing foam– Finalized hole layout on
acrylic baseplate and installed components
– Installed battery pack with velcro
– Slid acrylic baseplate into foam notches
– Created holes for balloon rope attachement in top and bottom through center of mass
– Connected electrical components and installed antenna
– Cut access hatch and sealed the lid
Test Program
• The whip test
• The drop test
• The stair pitch test
• The cooler testThe tests performed yielded positive results, suggesting that the survivability of the main structure and components within is likely.
• User Guide Compliance -Mass-1680g < 1700g-String Attachment
Expected Results
• Functionality• Will everything continue to work?
• Packets received/ packets sent• Are enough good packets being received?
• Telemetry• Are the packets we’re receiving correct?
Packets Received/ Packets sent
• Empirical data based on GeneSat/ PharmaSat passes. Theoretical data based on link budget.
• BOE = 1/10000
• Link Margin @ 45° = 26dB
• Expected number of “good” packets/ min ≈ 5
Telemetry
• Information sent:
• Call Sign
• Time
• Temperature
• Current consumption
• “Dummy data”Of good packets, how many had erroneous data?
GeneSat1.org00454B08000000660101006B0069008F0B00147A2A0013544D06
Expected Results
• Receive signals from the satellite– Ensures the range and quality of the
hardware– Ensures proper environment for hardware
• Receive health data packets from the satellite– Ensures an optimal range of the hardware– Further tests the environment on the
hardware
• Receive useful health data from the satellite– Tests the correctness of the software in a
longer term field test.– Tests the capabilities of the satellite to
truly monitor itself in a space environment.