# Presentation: 725690

## Operational Land Imager presented byJeanine Murphy-MorrisOLI Instrument ManagerNASA Goddard Space Flight CenterGreenbelt, Maryland  USALandsat Science Team MeetingUSGS EROSSioux Falls SDJanuary 8, 2008

## Overview

**OLI Characteristics**
**OLI Development Status**
**OLI Schedule**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Specifications

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Model

**Courtesy of  Ball Aerospace**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## Baseline Instrument Design

**Pushbroom VIS/SWIR sensor**
**9 channels from 443 nm to 2200 nm**
**Four mirror telescope**
**FPA consisting of 14 sensor chip assemblies**
**Solar Calibrator used once/week**
**Stim Lamps used to check intra-orbit calibration**
**Dark Shutter for offset calibration**
**12 bit resolution**

## OLI Characteristics

**Telescope/Optical Bench**
**  ****Four Mirror Compact with front aperture stop**
**  ****15 degree field of view**
**  ****Telecentric**
**  ****Excellent stray light rejection**

**OLI optical bench similar to ALI composite bench shown at right. **
**ALI telescope was a Three-Mirror Compact.**** **

**ALI optical bench**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Characteristics

**Focal Plane Array**
**  ****14 sensor chip assemblies mounted on single plate**
**  ****Hybrid Silicon/HgCdTe **
**  ****Butcher block filter assembly over each SCA**
**  ****Passively cooled**** **

**Similar layout to ALI FPA shown at right, but with single-chip modules**

**ALI FPA on fixture**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Characteristics

**     **
**  ****Calibration**
**  ****Solar diffuser**
**  ****Full aperture **
**  ****Once per week solar calibration**
**  ****Pristine diffuser to check degradation of main diffuser**
**  ****Requires spacecraft yaw maneuver**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Characteristics

**Calibration (continued)**
**  ****Stim Lamps**
**  ****For intra-orbit calibration/characterization**
**  ****Also can be compared to Solar Diffuser measurements to check stability**
**  ****Dark Shutter**
**  ****Used twice per orbit for offset calibration**
**  ****Dark detectors on focal plane to monitor offset drift**
**  ****Linearity checked by varying detector integration time**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Development Status

**Major Milestones**
**Cost-plus-award-fee contract awarded to Ball Aerospace in July 2007**
**Peer Reviews for subsystems held September and October 2007**
**Systems Requirements Review held 6-7 November 2007**
**Second round of peer reviews to be held January/February 2008**
**Preliminary Design Review will be held 4-7 March 2008**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Development Status

**Telescope**
**Optical design complete**
**Flight and primary, secondary, and quaternary mirrors being polished at Tinsley**
**Flight tertiary mirror lightweighting near completion at Zygo**
**Optical Bench is under contract**
**Focal Plane Array**
**Detector and ROIC PDRs complete**
**Filter peer review complete**
**Lessons learned from VIIRS angle resolved scatter issue being incorporated into filter design and testing**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Development Status

**Algorithm Development**
**Geolocation and Radiometric Calibration algorithms drawing on ALI heritage**
**Algorithm Description Documents completed by IPDR**
**Integration and Test Development**
**Peer Review this month**
**I&T incorporates Special Calibration Test Requirements**
**SCTR document includes requirements for characterization of OLI performance**

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007

## OLI Summary Schedule

- Landsat Science Team Mtg, USGS EROS

- January 8, 2007