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.