# Presentation: 924147

## Status of theLandsat Data Continuity Mission

***presented by***
**Bill Ochs**
**Landsat Data Continuity Mission Project Manager**
**NASA Goddard Space Flight Center**
***at the***
**Landsat Science Team Meeting**
**US Forest Service**
**Fort Collins, Co.**
**Jan. 6, 2009**

## Topics

**Programmatic Status**
**New Launch Readiness Date**
**OLI Status**
**S/C Status**
**Mission Operations Element Status**
**TIRS Status**

## Programmatic Status

## Initial Confirmation

**LDCM approved to proceed into Project Life Cycle Phase B**
**Key Decision Point – B (KDP-B) Review (Initial Confirmation) conducted on September 25, 2008**
**As a NASA Category 1 Mission, LDCM requires highest level approval of the Agency Program Management Council chaired by NASA Associate Administrator, Chris Scolese, to initiate each phase of the project life cycle **
**Phase B is the system preliminary design phase following concept studies, Pre-Phase A, and concept and technology development, Phase A**
**LDCM spent **9 years** in formulation, re-formulation, Pre-Phase A, and **
**    ****Phase A**

## KDP-B Process

**In preparation for KDP-B, LDCM conducted a System Requirements Review/Mission Definition Review/Preliminary Non-Advocate Review in May 2008**
**System Requirements Review (SRR)**
**Examines functional and performance requirements defined for the system and ensures the requirements and the selected concept will satisfy the mission**
**Mission Definition Review (MDR)**
**Examines proposed requirements, mission architecture, and flow down to all functional elements of the mission to ensure the overall concept is complete, feasible, and consistent with available resources**
**Preliminary Non Advocate Review (PNAR)**
**PNAR is conducted as part of the MDR to provide Agency management with an independent assessment of the readiness of the project to proceed to Phase B (mission executable within current cost and schedule)**
**SRR/MDR/PNAR is conducted by a Standing Review Board (SRB)**
**Independent review panel which conducts system level reviews and follows mission for entire development life cycle**
**Role of the SRB**
**Provides expert assessment of technical and programmatic approach, risk posture, and progress against baseline**
**Advisory role to Agency**
**Makes recommendations to improve performance or reduce risk**
**Provides independent cost and schedule assessments**

## New LDCM Launch Readiness Date

**Major finding of SRB**
**Original launch readiness date, July, 2011 was considered excessively aggressive and added risk to the mission**
**“****The existing LDCM development schedule is not achievable. There is less than a 20% chance that the July 2011 Launch Readiness Date (LRD) can be achieved.” **
**Mission schedules must reflect a 70% confidence level (70% chance of making launch date)**
**Project recognized schedule risk early in mission development**
**Had consistently expressed concerns with the “sporty” schedule**
**Was #1 Problem/Issue**
**Lack of project held funded reserve**

## Derivation of New LRD

**Five Independent Schedule Assessments were conducted**
**In developing a Revised LRD, the GSFC Resource Analysis Office (RAO) and IPAO schedule assessments were used as reference**
**RAO => retarget the launch date by 14 to 20 months**
**IPAO => retarget the launch date by 20 months**
**Retargeted Launch Date – Dec. 2012**

|  | LDCM 
 | Code 420
MCR | Code 420
Aerospace | GSFC
RAO | SMD
Aerospace | 
IPAO |
| --- | --- | --- | --- | --- | --- | --- |
| LRD | July 2011 | Feb 2014 | July 2013 | Sept 2012 – Mar 2013 | Sept 2013 | Feb 2013 |

## Changes to Schedule or “What Did We Do With An Extra 17 Mos.”

**17 mos. was used to either add schedule to current activities where short falls existed, add reserve, or both**
**Changes were based on recommendations from RAO**
**OLI - RAO recommended additional 8 - 16 mos.**
**Extended current 39 month development to 49 mos.**
**Use extra 10 months as Project held reserve**
**S/C – RAO recommended additional 9 -14 months**
**Avg. development time across all s/c - 10 months longer than LDCM**
**Added 6 mos. to existing GD schedule**
**Use remaining 4 months as project held reserve on S/C**
**Obs.  I&T – RAO recommended additional 5 – 8 months**
**Extended Obs. I&T by 6.5 months**
**Add 3 mos. to existing Obs. I&T schedule**
**Use remaining 3.5 months as project held reserve**
**Launch Site Processing extended from 2 months to 2.5 months**
**Add 2 weeks to maintain GSFC schedule reserve standards**

## Historical Schedule Comparisons

**Recommended OLI**
**49 Month**
**Development**

**Current OLI**
**39 Month**
**Development**

**Current 38 Month**
**S/C ATP**
**to Launch**

**Recommended 55 Month**
**S/C ATP**
**To Launch**

## New LRD

**Revised LRD provides **
**Appropriate level of confidence**
**Sufficient schedule reserves on the critical path**
**Allows for some schedule erosion between now and Confirmation**
**Confirmation is where a commitment to Congress is made**
**Reserve meets GSFC’s, *****Schedule Margins and Budget Reserves to be Used In Planning Flight Projects and In Tracking Their Performance ***
**Approved by NASA Agency Program Management Council***** ***

## Dec. 2012 LRD Schedule

## Operational Land Imager Status

## OLI Status

**OLI CDR successfully conducted Oct. 27-30**
**Flight Hardware**
**Optical Bench completed and delivered to BATC**
**All flight optics completed and delivered to BATC**
**All 16 flight butcher block filter assemblies delivered to BATC**
**All 16 EDU focal plane modules completed**
**EDU Instrument Support Electronics box completed**
**EDU Focal Plane Electronics in box-level testing**
**New OLI Baseplate**
**Baseplate helps 'buffer' the maturity gap between the observatory elements**
**Limits impacts to OLI interface from either changes in spacecraft or TIRS designs**
**Either the baseplate itself and/or the thermal control subsystem (radiator sizes, blanket designs, etc.) **
**Allows work to keep moving on the telescope, the electronics box designs, the focal plane, etc.**
**Allows OLI to shipped to GD as a whole unit and break down after testing **
**Baseplate (as proposed) will delay OLI delivery from late Oct. 2010 to mid-Dec. 2010**

## OLI Status

**Some Issues Along The Way**
**Ghosting**
- During CDR preparations it was discovered OLI ghosting violates requirements by a factor of ~2
- Further analysis of the OLI optical model showed reflections from the FPA window onto adjacent bands on the focal plane module
- Ball’s new baseline design now tilts FPA window 16.7 degrees based on results of refined ghosting analysis. Corrects for all ghosts.
- Project independent analysis of Ball’s optical design expected to be completed in January
**OLI EDU FPM Surface Leakage**
- Ball formed Anomaly Review Board (ARB) with GSFC Project representatives
- Track down root cause, recommend corrective action, assess project impact and risk
- Cause of leakage thought to be high resistivity silicon PIN material that is sensitive to process variations
- RVS performing “Design of Experiment” to understand variations and improve process.  Complete in April 2009.
- Project and Ball developing decision milestone dates regarding use-as-is vs. pursuit of new fabrication cycle.
- Potential OLI delivery impact between zero and ~4 months

## Spacecraft Status

## LDCM Spacecraft

**COMMAND & DATA HANDLING**
*cPCI architecture; RAD750 CPU*
*3.1 Tbit (BOL) solid state recorder*
*265 Mbps peak OLI data transfer*
*26.2 Mbps peak TIRS data transfer*
*High rate PB at 384 Mbps*

**ELECTRICAL POWER**
*Single wing single axis articulated GaAs solar array provides 4300 W at EOL*
*125 amp-hour NiH**2** battery*
*Unregulated 22 V - 36 V power bus*
*Two power distribution boxes*

**GUIDANCE, NAVIGATION **
**& CONTROL**
*2 of 3 star trackers active*
*High precision IRU*
*Honeywell reaction wheels*
*SADA with damper*
*3-axis stabilized*
*Zero momentum biased*

**STRUCTURE**
*Aluminum primary structure*
*Externally mounted components*
*Clear instrument FOVs*
*Clear instrument radiative paths*

**THERMAL CONTROL **
*Passive with heaters*
*Constant conductance heat pipes (if needed)*

**PROPULSION**
*Hydrazine blow-down propulsion module*
*Eight 22N Redundant Thrusters*

**COMMUNICATIONS**
*S-band to GN/LGN:  1, 32kbps uplink: and 2k,16k, 32k, or 1 Mbps downlink*
*Omni antennas*
*TDRSS - SA:  1 kbps return and 2 or 32 Kbps forward*
*X-band:  384 Mbps science data*

**Contract awarded to General Dynamics Advanced Information Systems in April 2008**

## S/C Status

**SRR held Sept. 3-4, 2008**
**4 Deficiencies:**
**Requirements Flow Down**
**Open requirements**
**Instrument Interfaces**
**Fault Management**
**GSFC and GD worked  together to ensure all SRR deficiencies adequately addressed**
**Major areas of concentration included instrument interfaces (both OLI and TIRS) and resolution of open requirements**
**Delta SRR was successfully conducted on Dec. 17****th**
**Working towards PDR at end of March**

## Mission Operations Element Status

## Mission Operations Element (MOE)

**NASA awarded the MOE to The Hammers Company in Sept., 2008**
**Provides the primary means to control and monitor the spacecraft**
**Mission planning and scheduling**
**Command and control**
**Monitoring and analysis**
**Flight dynamics**
**Onboard memory management **
**MOE SRR successfully conducted in Nov. **
**1****st**** instance of the MOE delivered to GSFC in Nov.**
**Off-The-Shelf version**

## TIRS Status

## TIRS Status

**A Phase A Study was initiated July 1, 2008.**
**The Purpose of this study was to procactively investigate the implementation of a Thermal Infrared Sensor for LDCM and provide risk mitigation to the Dec. 2012 LRD.**
**Evaluate / Allocate LDCM requirements.**
**Create a feasible concept design.**
**Assess the programmatic implementation including the scheudle and early procurements needed prior to PDR.**
**Begin the instrument development activities.**
**Concept design developed, meets or exceeds the TIRS performance requirements.**
**System Concept Review held October 17, 2008**
**Independent Review of the current TIRS concept.  **

## TIRS Status

**Development of Quantum Well Infrared Photodetector (QWIP)**
**Detectors produced that meet TIRS spectral requirements.**
**ROICs successfully completed both Proton and Gamma Radiation tests.**
**Engineering Model hardware exists for all components of the Focal Plane Array.**
**TIRS Instrument implementation targets LDCM launch date of December, 2012.**
**Instrument delivery planned for December 2011, allowing 10 mos. integration and test at the spacecraft vendor.**
**Current instrument development schedule is detailed for each subsystem and instrument I&T and meets the required delivery date.**
**System Requirements Review scheduled for February 2 and 3****rd****, 2009**
**Review all Level 4 and driving level 5 requirements and traceability to Level 3.**
**Review updated concept and system performance against requirements.**
**TIRS PDR scheduled for May 2009**

## TIRS Instrument Diagram

**Scene Mechanism**

**Scene Mirror**

**Nadir**

**Spaceview**
**Calibration**

**Hot Calibration**
**Target**

**Telescope Optics**

**QWIP FPA**

**Instrument Deck**
**Interface**

**Baffle**

**Baffle**

**TIRS Optical Sensor Unit**

**TIRS Instrument Diagram**

## Spacecraft View

**MEB**

**Cryocooler Electronics**

**Nadir Baffle**

**Deployable Earth **
**Shield**

**TIRS**

**OLI**

## TIRS Decision

**Congressional interest in TIRS remains high**
**Development of the LDCM spacecraft will not preclude the accommodation of a TIRS instrument**
**Accommodation of TIRS does not impact the performance of the Operational Land Imager**
**Project proceeding down path as if TIRS will be there**
**Directed by Agency PMC at KDP-B to proceed at risk**
**Management of the TIRS instrument currently under purview of LDCM**
**TIRS team is fully integrated into LDCM team**
**Resolution is expected from the final FY09 appropriations language**
**Hopefully this spring**