# Presentation: 227610

## EO-1 Spacecraft

**2 -20**

## EO-1 Instruments and Technologies

**2 -21**

## GN&C:
Three-axis stabilized
Pointing accuracy of 0.022° (3) in all three axes
Jitter is <5 arcseconds (3)
Star camera
GPS
Independent safehold processor
Power:
Three panels of silicon cells @ 600W EOL
300W orbital average
NiCd battery 50Ahr
Bus = 28 ± 7 VDC

***Spacecraft Subsystems***

***GN&C:***
*Three-axis stabilized*
*Pointing accuracy of 0.022° (3****) in all three axes*
*Jitter is <5 arcseconds (3****)*
*Star camera*
*GPS*
*Independent safehold processor*
***Power:***
*Three panels of silicon cells @ 600W EOL*
*300W orbital average*
*NiCd battery 50Ahr*
*Bus = 28 ± 7 VDC*

***C&DH:***
*Mongoose V processor @ 12 MHz*
*1773 fiber optic data bus*
*Midex architecture*
***Propulsion:***
*Hydrazine*
*Used for orbit maintenance, formation flying, and correcting insertion errors*
*Four thrusters @ 0.2 lb each*
***Structure:***
*Aluminum*
*Mass = 370 Kg*
*Hexagonal Right Prism*
*Equipment panels serve as radiators*
***Payload Interface:***
*Alignment measured to 20 arcseconds*
*Thermally coupled to spacecraft*

**2 -22**

## Ground System Requirements Summary

***Ground System Requirements Summary***
*Ground stations to receive, process, and route science and HK data to GSFC*

***X-Band:  Receive 80 Gbits of science data each day at 105 Mbps ***
*Record the received X-band data on hard media, mail to GSFC, and store raw data for 30 days*
***S-Band:  Receive data at selected rates up to 4 Mbps***
*Housekeeping data: Route selected virtual channels to GSFC in real time, record up to 200 Mbits of data each day, and FTP recorded data to GSFC within one hour. Store raw data for 30 days.*
*Backup science data (up to 10 Gbits per day): Process as with X-band.*
***Perform Level 0 processing on the science and HK telemetry***
*Fill holes, reorder science into band order*

**2 -23**

## Nick Speciale

*Nick Speciale*

**MISSION TECHNOLOGIST**
**Code 730**

*Dale Schulz*

**MISSION MANAGER**
**Code 426**

*Dr. Stephen Ungar*

**MISSION SCIENTIST**
**Code 923**

*Pete Spidaliere*

**MISSION SYSTEMS ENGINEER**
**Code 730**

*Dr. Matt Jurotich*

**INTERFACE ENGINEER**
**Code 730**

**ALI**
**INSTRUMENT MGR**
**Code 740**

*Tom Gostomski*

**I&T**
**MANAGER**
**Code 568  **

* *

*Ralph Welsh*

**2 -24**

## Responsibilities of Key Personnel

**2 -25**

## Responsibilities of Key Personnel (Continued)

_***MISSION ASSURANCE MANAGER***_
***Establishes and assures conformance to Mission Assurance Requirements commensurate with a technology validation mission***
***Senior Performance Assurance Engineer***
***Reports to Office of Flight Assurance***
_***SPACECRAFT SYSTEMS ENGINEER***_
***Responsible for spacecraft bus development***
***Systems Engineer***
***Reports to Mission Manager***

_***INSTRUMENT SYSTEMS MANAGER***_
***Responsible for instrument development and instrument to spacecraft bus integration***
***Senior Instrument Manager***
***Reports to Mission Manager***
_***INSTRUMENT MANAGER(S)***_
***Responsible for development and spacecraft bus integration of one of the mission instruments***
***Instrument Manager / Engineer***
***Reports to Instrument Systems Manager***
***Responsible for ground system development***
***Ground System Engineer***
***Reports to Mission Manager***

_***GROUND SYSTEMS DEVELOPMENT MANAGER***_

**2 -26**

## Chronology of Significant Events 

***Chronology of Significant Events ***

***EO-1 approved in March 1996 for $90M with only the ALI***
*Advanced Land Imager*
*Multispectral imaging capability*
*Wide field, high resolution, all reflective optics*
*Silicon Carbide Optics and structure*
*Wedge Imaging Spectrometer (WIS)*
***Complement of NMP technologies completed in July 1996 for an additional $9M***
*Grating Imaging Spectrometer (GIS) added to ALI*
*Atmospheric Corrector*
*Spacecraft Technologies*
*X-Band Phased Array Antenna*
*Fiber Optic Data Bus*
*Carbon-Carbon Radiator*
*Lightweight Solar Array*
*Enhanced Formation Flying*
*Pulse Plasma Thruster*

**2 -27**

## Chronology of Significant Events(Continued) 

***Chronology of Significant Events****(Continued)**** ***

***Early definition carried out by the Engineering Directorate from April through August 1996***
***Early definition revealed three technologies that would be “stretched” to successfully complete the flight validation of the assigned NMP technologies***
*Wide-Band Advanced Recorder / Processor (WARP)*
*Global Positioning System Receiver (GPS)*
*Precision Pointing capability to validate the WIS*
***Spacecraft DCR held in November 1996 and ALI DCR in the following January***
***Design-to-Cost methodology adopted in December 1996 and DTC targets distributed in January 1997***
***Silicon Carbide structure canceled in January 1997 due to manufacturing problems***
***DTC trade studies and some restructuring to remain within budget from February through March 1997***

**2 -28**

## Chronology of Significant Events(Continued) 

***Chronology of Significant Events****(Continued)**** ***

***Moved from Taurus to Delta 7320 and co-manifest with SAC-C in February 1997***
***Confirmation Review held in May 1997***
***CDRs held throughout June 1997***
***Moved NMP Office from STAAC to FPD in July 1997***
***Developed responses to Confirmation Review and CDR recommendations from July through September 1997***
***Presented to GSFC Management Council in September 1997 requesting a budget augmentation of $7.2M  to fully accommodate the recommendations of the CR and CDR and cover overruns at SBRS and with the WARP and FODB***
***OES agreed to $7.2M augmentation in January 1998***

**2 -29**

## Chronology of Significant Events(Continued) 

***Chronology of Significant Events****(Continued)**** ***

***Sensor Chip Assemblies from SBRS for the WIS and GIS canceled in February 1998 due to performance, cost, and schedule reasons***
***Fiber Optic Data Bus also canceled at this time since high data rates were no longer available***
***Asked to develop options to meet NASA’s near-term Hyperspectral needs from February through April 1998***
***OES selected HYPERION enhancement in May 1998 to restore a Grating Imaging Spectrometer to EO-1 and fulfill Lewis Science / Commercial / Educational objectives. Cost is estimated to be $38.6M. ***

**2 -30**

## Budget Changes 

***Budget Changes ***

***Original EO-1 mission approved for $90M in March 1996***
***Spacecraft technologies, Atmospheric Corrector, and ALI enhancement (GIS) added for $9M in July 1996***
***Confirmation Review and CDR accommodations for $7.2M in January 1998***
***HYPERION Enhancement approved for initiation in May 1998 for $38.6M***
***NMP provides $3.4M for Hyperion as an independent instrument***
***Projected cost of EO-1 Mission now at $148.2M***

**2 -31**

## Launch Date Changes 

***Launch Date Changes ***

_***ESTIMATE***__***	***__***ESTIMATE DATE***__***	***__***LAUNCH DATE***_
***Architectural***
***Development******	******Jan. 1996******	******Dec. 1998***
***Team******	***
***Approval Baseline******	******Mar. 1996******	******May 1999***
***HYPERION***
***Enhancement******	******Apr. 1998******	******Dec. 1999***

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## Recent and Planned Reviews

***Hyperion Concept Review ******. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ******	****August 6, 1998*
***Hyperion CDR ******. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .****** ****	**September 15, 1998*
***Delta CDR for the Hyperion Enhancement ******. . . . . . . . . . . .******	****September 23, 1998*
***Delta Confirmation Review ******. . . . . . . . . . . . . . . . . . . . . . . . . . .******	****October 14, 1998*
***Launch Minus 1 Year Review ******. . . . . . . . . . . . . . . . ******	****Planned for December 1998*
***Pre-Environmental Reviews ******. . . . . . . . . . . . . . . . . . . . . . . . . . .******	****ALI in July 1998*
*	**	** **Hyperion in February 1999 *
*	**	**Spacecraft in March 1999*
***Pre-Ship Reviews ******. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .******	****ALI in January 1999*
*	**	** **Hyperion in May 1999*
*	**	**Spacecraft in October 1999**	*
***Launch Readiness Review ******. . . . . . . . . . . . . . . . . . .******	****Planned for December 1999*

***Recent and Planned Reviews***

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## EO-1 Current StatusDevelopmental

***EO-1 Current Status****Developmental*

***Hyperion: ******	******CDR in 9/98******	******Delivery in 6/99***
***ALI:******	******In environmental testing******	******Delivery in 2/99***
***WARP: ******	******In assembly******	******Delivery in 2/99***
***Precision Pointing:  ******	******	******Star Tracker delivery in 2/99 ***
***AC:  ******	******Sub-assemblies nearly finished******	******Delivery in 11/98***
***EFF:  ******	******In final testing******	******Delivery in 10/98***
***XPAA:  ******	******Delivered******	***
***LFSA:  ******	******Delivered******	***
***PPT:  ******	******Delivered******	***
***CCR:  ******	******Delivered******	***

**2 -34**

## EO-1 Current StatusSchedule, Cost, & Risk

***EO-1 Current Status****Schedule, Cost, & Risk*

***Schedule:***
*82% toward May 1999 Launch (Original Baseline)*
*68% toward December 1999 Launch (Includes Hyperion)*
***Cost:***
*Original Baseline Mission:**	**83% spent toward $106.2M*
*Hyperion:**	**15% spent toward $40.2M*
*Combined:**	**64% spent toward $151.4M*
***Risk:***
*Technical:**	**Hyperion, WARP*
*Schedule:**	**Hyperion, WARP, Star Tracker*
*Budget:**	**Hyperion, Hyperion Spacecraft Accommodations*

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## Hyperion Accommodation Philosophy

***Hyperion Accommodation Philosophy***

***Required WARP and Spacecraft mechanical, electrical, software, data bus, and thermal requirements are fairly straightforward, as are the ALI thermal changes.***
***The Attitude Control System cannot be changed and new requirements are not being considered, instead we will live within the capabilities of the ACS existing system. ***
***Ground System changes require a slight enhancement of the baseline system.***

***The approach taken to accommodate the Hyperion has been to do so without jeopardizing the baseline mission or requiring radical change to the WARP or the Spacecraft, ALI, or Ground Segments.***

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## Incremental Implementation of Hyperion

- 12/1/99

- 11/1/99

- 10/1/99

- 9/1/99

- 5/27/99

- NOW

** Launch Readiness Date*

***Incremental Implementation of Hyperion***
*“**Return To Baseline” Options*

**10-14-98**

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