2012CoDR

RocketSat 8 Conceptual Design

ReviewUniversity of Colorado

Boulder10/4/11

2012CoDR

Mission Statements

• RocketSat 8 shall integrate and validate the Roll Out De-Orbiting Device (RODEO) developed by Composite Technology Development (CTD). This shall provide a means to de-orbit future small satellites.

• RocketSat 8 shall validate an attitude determination system for future RockSat missions

2012CoDR

Theory and Background

• 23 small satellites (10kg-500kg) launched every year by the United States

• Growth of small satellites in space exponentially increases the likelihood of collisions

• The rise in the number of satellites in orbit has led to an increasing need for a cost effective and lightweight means to de-orbit small satellites.

• The RocketSat VII attitude determination system was successful, but the accuracy of the system couldn’t be verified since there was no known solution for the attitude of the rocket.

2012CoDR

Requirements

Project Requirements Parent Requirement

O1 Shall deploy the RODEO device Mission Objective

O2 Shall validate the deployment of the RODEO device Mission Objective

O3 Shall validate the ability of RODEO to de-orbit small satellites

Mission Objective

O4 Shall comply with all RockSat-X requirements Mission Objective

O5 Shall determine the orientation of the payload Mission Objective

2012CoDR

Requirements (cont.)System Requirements Parent

RequirementS1 Shall deploy the RODEO device on the RTS (RODEO Test Structure) O1S2 Shall capture image of deployed RODEO sail O2S3 Shall detach the RTS from the rocket canister O3S4 Shall confirm that RTS experiences deceleration O3

S5 Shall meet all structural requirements as defined in the RockSat-X user guide

O4

S6 Shall meet all electrical requirements as defined in the RockSat-X user guide

O4

S7 Shall determine the orientation of the payload within ten degrees of accuracy

O5

S8 The orientation of the payload shall be known on all three axis O5

2012CoDR

Requirements (cont.)System Level 2 Requirements Parent

RequirementS1.1 Shall deploy in a time sufficient for the needs of the mission S1

S2.1 Shall capture an image of RODEO while it is in the field of view of the camera

S2

S2.2 Shall set a image frame rate and quality that confirms RODEO deployment

S2

S2.3 Shall store the image data S2

S3.1 Shall detach from rocket at the determined time S3

S3.2 Shall detach from rocket without damaging equipment S3

S3.3 Shall generate acceleration upon detachment S3

S4.1 Shall measure deceleration of the RTS S4

S4.2 Shall transmit deceleration data from RTS to the rocket S4

2012CoDR

Requirements (cont.)System Level 2 Requirements (continued) Parent

RequirementS6.1 Shall have sufficient power to perform all required operations S6

S7.1 Shall use attitude sensors that are within five degrees of accuracy

S7

S7.2 Shall incorporate an attitude determination algorithm that is accurate to within ten degrees of accuracy

S7

S8.1 Shall employ attitude sensors that can determine the attitude on all three axes

S8

2012CoDR

Minimum Success Criteria

• Mission success depends on the image capture of the deployed RODEO device.

• Secondary mission success is determined by the validation of the RocketSat8 attitude determination system

2012CoDR

Mission overview: Concept of Operations

Continue Telemetry

Splash Down

End TelemetryPre-Launch

-Begin Telemetry

-Begin attitude data collection

Deploy RTS

RTS data collection

Send Data from RTS to payload

Apogee

Altitude: ≈160 km

Initialize Camera

Begin Rodeo Deployment

Chute Deployment

Continue Telemetry

2012CoDR

Mission overview: Expected ResultsWe expect:• the RODEO system to be fully extended while attached to the

rocket

• to capture an image of the extended RODEO system

• the RTS to detatch from the rocket canister

• to measure deceleration from the RTS

• to transmit the deceleration data from the RTS

• We expect to characterize the rockets attitude and verify it with a known solution

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2012CoDR

Design Overview

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2012CoDR

User Guide Compliance: Structures

• The payload shall fit into the allotted 12 in diameter base and 11 in height and weigh less than 30 +- 1 lb.

• The center of gravity shall be within 1 square inch of the RockSat-X deck.

• Materials with a high resistance to stress corrosion and cracking, and a low outgassing index will be used.

• The deployable shall conform to all standards to safely eject from the canister.

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2012CoDR

Payload Layout: Structures

• The structure thus far will be composed of two plates.• The bottom plate will include the RTS containing the

deployable given to us by Composite Technology Development, as well as the ejection system.

• The electronics boards and the ADS(Attitude Determination System) will all be utilized on the top plate with the cameras.

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2012CoDR

Payload Layout: Structures

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Electronics BoardD

eplo

yabl

eBottom Plate

Camera onbottom of top plate

Top Plate

Keep Out Zone

Eje

ctio

n S

yste

m ADS

2012CoDR

RODEO Test Structure (RTS) Layout: rough diagram

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RTS

RODEO

Note: Drawing not drawn to scale

2012CoDR

Mission Requirements

• The payload shall conform to the requirements set forth in the 2011 RockSat-X User Guide

• The system shall successfully deploy the hardware manufactured by Composite Technology Development.

• The structure will interface with RockSat-X through provided mounting surfaces.

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2012CoDR

Mission Requirements: Electronics Integration• All electronic interfaces will be held in place throughout the duration of

the flight with the exception of the deployable.

• The structure will withstand the forces of launch and protect the scientific and electrical systems.

• The structure will thermally protect the electronics for as long as reasonable data can be collected.

• The system shall successfully take at least one photo of the deployable as it leaves the canister, and house the cameras securely during launch.

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2012CoDR

Mission Requirements: Ejection System

• The ejection system shall be durable enough to survive the forces of launch.

• The structure shall allow exposure to an open air environment while still protecting electronics and instruments from harm.

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2012CoDR

Electrical Subsystem

Electrical Subsystems:- Power- Memory- Radio Communications (Comm)- Mechatronics- Imaging

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2012CoDR

Conceptual Electrical Configuration

Note: Not actual layout

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MCU

RTS Deploy

PowerComm

Mem

ory Power

Comm

Imaging

SailDeploy

MCU

Main Structure

RTS

Sensors

Power lineDigital lineAnalog Line

Charging(beforedeploy)

Radio

ADS

2012CoDR

User Guide Compliance: Electrical• The GSE Controlled power lines shall carry a total

current of less than 1.85 A.• The Timer Controlled power lines shall carry a total

current of less than 3.75 A.• All telemetry lines shall operate in the range of 0 – 5 V.• All components shall operate at 28 V or less. Higher

voltages shall be used only with express written permission.

• All components shall be conformal coated to protect from the space environment.

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2012CoDR

State Chart: Software

State 1Pre-Launch

State 2Launch

State 3Apogee

State 4Post-Apogee

State 5Splash Down

Power On

G Switch

Initial Code• Initialize Devices• Check G Switch

No

Main Code• Store Data• Check Timed

Sequence One

Yes

TelemetryApogee Code

• Initialize Camera• Delay 30 seconds

CameraDeploy Code

• Deploy RTS• Get Data RTS

Yes

Telemetry

RTS

Final Code• Check Time

Sequence Two• Stop Recording

Telemetry

2012CoDR

Design Overview: RockSat-X 2012 User’s Guide Compliance

ComplianceRough Order of Magnitude (ROM) mass estimate

Plates and launcher ~ 10 lbsRts ~ 2-3 lbs

Estimate on payload dimensions RTS~ 1U cube sat configuration

Deployables/booms? Yes-Deployable

How many ADC lines? Exact amount not confirmed

Asynchronous use? Yes

Parallel use? Yes

Power lines and timer use? Yes- will need timer for RTS deployment

CG requirement UnderstoodAre you utilizing high voltage? No

2012CoDR

Management

Andrew BroucekProject Manager

Wheeler GansSystems Lead

Nate Keyek-Franssen

Structures Lead

Emma YoungScience Lead

Andrew ThomasElectrical Lead

Ethan LongSoftware Lead

Devin MackenzieStructures

Kameron MedinaStructures

Eric LobatoScience

Aram PodolskiScience

Shreyank AmartyaElectrical

Brendan LeeElectrical

Long TatSoftware

2012CoDR

Preliminary Schedule- Important Dates

Task DateConceptual Design Review

(CoDR)10/4/11

Online Progress Report 1 Due

10/21/11

Preliminary design Review (PDR)

10/25/11

Online Progress Report 2 Due

11/11/11

Critical Design Review (CDR)

11/29/11

Order Hardware and Begin Fabrication

12/5/11

2012CoDR

Preliminary Schedule- Weekly Schedule

Day Time/DescriptionMonday 1-3pm Software Team meeting

Tuesday 2-3pm Structures Team meeting5-7pm Science Team meeting

Wednesday 2-3pm Executive Meeting

Thursday 4-6pm Electrical Team meeting

Mon-Fri 5-8pm Common working hours

2012CoDR

Budget

Source of Funding AmountComposite Technology Development $24,000

UROP (Not Confirmed) ~$3,000

EEF(Not Confirmed) ~$2,000

Total: $29,000

2012CoDR

Additional Support

• We will be working in conjunction with Composite Technology Development (CTD). Our main advisors from CTD are still to be determined

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2012CoDR

Conclusions

Mission StatementTo integrate and validate the Roll Out De-Orbiting Device

(RODEO) developed by Composite Technology Development (CTD) and test the attitude determination system from

RocketSat VII Next Steps• Prepare for PDR• Finalize Design

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2012CoDR

Questions

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2012CoDR

Refrences1"The Bright Future of Small Satellite Technology :: Via Satellite." Guest Edition :: Satellite Today. Web. 04 Oct. 2011. <http://www.satellitetoday.com/via/features/37150.html>.

2Carroll, Shawn, and Chris Koehler. Rocksat-X User Guide. 8 Feb. 2011. PDF.

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