cubesat (eng491cu1) informational meeting get interdisciplinary design experience working on one of...
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CubeSat (ENG491CU1)Informational Meeting
Get Interdisciplinary Design Experience Working on One of the Worlds Smallest Satellites
Fall 2005
Presentation Overview
People Involved Introduction to CubeSats Introduction to ION
Semester Priorities and Teams Class Information Calendar Next Steps
People
Purvesh Thakker (ECE PhD Student)
Prof. Gary Swenson (ECE Remote Sensing)
Prof. Victoria Coverstone (AE Orbital Mechanics)
Prof. Matt Frank (ECE Software)
Systems TeamProgram Manager(s) (1-2 Graduate Student TAs)
Faculty Advisors (Remote Sensing, Orbital Mechanics, and Software)
Systems TeamProgram Manager(s) (1-2 Graduate Student TAs)
Faculty Advisors (Remote Sensing, Orbital Mechanics, and Software)
Electrical TeamElectrical Team
Software TeamSoftware Team
Attitude Determination and Control (ADCS)
Team
Attitude Determination and Control (ADCS)
Team
Ground Station TeamGround Station Team
Mechanical TeamMechanical Team
Corporate Partners, Electronic Services Shop, External Faculty Advisors, Machine Shop
Corporate Partners, Electronic Services Shop, External Faculty Advisors, Machine Shop
Cubesat Satellites
PPOD 3 CubeSats
Cubesat Satellites
Cubesat Project History.– Started as collaboration between California Polytechnic State
University (Cal Poly) and Stanford University.– Provides a standard for design of picosatellites.
Provides for common deployer. Allows for reduced cost and development time. Lets any individual or organization develop their own satellite.
Standard cubesat satellite is:– 10 cm cube with mass of 1kg.
Approximately 60 registered Cubesat Teams. Typically launches provided by Russian company.
– Multiple cubesat’s piggy-back along commercial launch.– 6 cubesats were launched Summer 2003.
University of Illinois CubeSat
Illinois Tiny Satellite Initiative started in ~August 2001
Various majors (AE, CE, EE, ME, TAM, CS, GE)
Typically 15 students involved
Over 100 students involved to date
Completed ION shown with DNEPR launch vehicle from Russia’s Kosmotras
University of Illinois Cubesat - ION
Costs– Parts/Labor: $30,000 USD.– Launch: $85,000 USD.
Delivered to Cal Poly: April 2005 Launch date: Tentatively November, 2005
– DNEPR launch provided by Kosmotras.– 14 cubesat satellites expected launched.
UIUC, Cornell, Norway, Cal Poly, South Korea, Taiwan, Arizona…
Launch Parameters– Low Earth Orbit at 650-700 km.– Orbit lifetime 14+ years.
ION Missions
Mission 1: ION’s photometer studies dynamic drivers of the upper mesosphere
Thunderstormconvection
Mountains
Waves of oxygen airglow perturbations carried by
wind (760nm)
ION
Misssion 2: ION tests VAT thrusters from Alameda
Mission 3: ION tests SID processor board from Tether Applications
Mission 4: ION tests B/W CMOS camera
Mission 5: ION demonstrates ground based attitude control on a CubeSat
Sensor telemetry
Actuator commands
ION Hardware
ION Photos
ION’s Earth ground track
Photometer with lens and filter housing
Thruster (above) and thruster firing (below)
Photograph from CMOS camera
Torque coil on a PC board
0 2 4 6 8 10 12-5
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5Angular Body Rates
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deg/
sec)
Time(hr)
roll
pitchyaw
-70
-65
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-55
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-45
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-180-170 -160
-150-140
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-20-100
102030
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140150
160 170
Antenna strength along outside of bagel-shaped pattern
ION Internal Wiring
More ION Photos
ION Software
Environmental Testing
ION vibration test in test PPOD
Thermal-vacuum chamber
U IU C C u b e S a t V ib ra tio n R e sp o n se Da ta
E T S 2 005 -2 7 , DNE P R H ig h L e v e l In p u t, L o n g A xis
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10 100 1000 10000
F re q u e n c y, Hz
Satellite Response Control Response Required Grms
DNPER High level Vibration Test Response Data, Long Axis
Fall 2005 Priorities
ION 1– Prepare Ground Station– Practice, practice, practice communication– Battery charger– Launch and operations?– Publications, tutorials
ION 2– Prototype power, C&DH internal software– Order and test communication system– Design structure, attitude control system– Define payloads
Fall 2005 Teams
ION 1 Ground Team: Improve ground communications system, practice communication
ION 2 Power Team: Build prototype of design from Summer ION 2 Command & Data Handling Team: Develop prototype internal
communication software ION 2 Communications Team: Implement and test communications
hardware including ground station ION 2 Structures Team: Design the structure of the satellite ION 2 Attitude Control Team: Design hardware and software for
controlling satellite orientation
ION 2 Sensors Teams: Develop payloads to support various satellite missions
Teams – ION 1 Ground Team
Fix Antenna Practice communications with satellites Misc. ground station improvements Backup stationary antenna Operate satellite after launch
Develop remote ground stations Train ground operators
Teams – ION 2 Power
Solar Panel power point tracking Battery charger Satellite sleep mode System watchdog timer Voltage, current, and temperature sensors PIC Regulators Switches Latchup protection
Teams – ION 2 Cmd & Data Hnd.
Define internal satellite communication Prototype internal communication bus with PICs Document internal communication interface PIC Training documents
PICs Memory I2C communication Packet definition Memory management Error and flow control Prototype Main PC Board Satellite to ground communication software
Teams – ION 2 Communications
Design communication system Select flight and ground hardware Test and modify hardware as needed Design and develop antenna
Teams – ION 2 Structures
Satellite fabrication Fulfill all Cubesat physical spec requirements. Design frame, mounts, etc Switches, data port, separation springs Removable battery Epoxies Solar panel construction Deployable antenna?? Vibration Testing Thermal/Vacuum testing
Teams – ION 2 ACS
Handles all ACS hardware and software Performs attitude/orbit simulation and analysis
ACS sensors and actuators ACS processor Attitude control software Attitude determination software
Class Meetings
Weekly Systems Team Meeting– Poll each team– Discuss activities from previous week– Discuss plans for next week– Announcements, etc.– Occasional special presentations by advisors/faculty.
Lab Hours– No class “lab hours”– Each team establishes own weekly lab hours– Declare team lab hours team proposal– Log all hours with a brief description of what was done– Class requires ~50 lab hours per credit (per university
guidelines)
Resources
Course Web Site– http://cubesat.ece.uiuc.edu
Course Class Drive– V:\cubesat folder on Cubesat computers– See Training folder
Labs– 206H Talbot– 330E Everitt Lab
ECE/Talbot Machine Shops
Tentative Calendar
Thursday, Aug 25: Informational Meeting Monday, Aug 29: Meet with TA / Select Teams Tuesday, Aug 30: First Systems Meeting Tuesday, Sept 6: Team Proposals
Tuesday, October 18: Design Review
Thursday, Dec 8: Final Demo / Documentation Review
Team Proposals
Ten minute presentation for each team Each team member should discuss their focus
item
Team Members with major, year, credits/hours Team semester plans Focus items for each person Week by week planned schedule Team weekly lab hours
Handouts
Getting Started SSH into Class Drive Class Registration Form
Registering for CubeSat
Juniors/Seniors register for Interdisciplinary Senior Design for 1 to 3 credits– ENG491CU1 (Fall)– ENG491CU1 (Spring)– Need to have approval form signed to register
(available on Web Site)
Grad students register for Independent Study– Course number varies by department– Thesis/Master’s Project sometimes possible
Grading
Based on – Lab hours– Contributions to team– Participation in systems meetings– Participation in reviews– End of semester activity summary
Success in course depends on your individual initiative
Next Steps
Register for class Sign up for class email list Meet with TA to identify team Get access to labs, computer accounts, etc Become familiar with project
– Read ION paper– Read documentation for your team– Browse available team files on class drive
Establish regular team work sessions Team proposal due one week after teams established