6.0 flight segment (if part of mpdr) (chris brann/flight ... · sensors and pre-flight testing...

NASA Sounder Science Team Meeting

NASA Sounder Science Team

Meeting

JPSS Cross Track Infrared Sensor (CrIS)

Sensors and Pre-Flight Testing

David Johnson

CrIS Instrument Scientist


Agenda

• Sensor overview

• Technical performance measurements, requirements, and waivers

• Performance test overview

• Key changes from SNPP through JPSS1, JPSS2, JPSS3, and JPSS4

– Sensor changes

– Test changes

• Summary

2October 5, 2018


CrIS Instrument Overview

• Instrument Status & Development Plan:

– SNPP launched 10/28/2011• CrIS SDR provisional 1/31/2013, validated

12/20/2013

– JPSS-1 launched 11/18/2017• CrIS SDR provisional 2/16/2018, expect

validated as of 8/14/2018

– JPSS-2 in Pre-Environmental TVAC

• PER: Oct 2018 (TBC)

• Delivery: Sep 2019

– JPSS-3/4

• J3 PER: Sep 2019

• J3 PSR: Sep 2020

• J4 PER: Nov 2020

• J4 PSR: Dec 2021

• Cross-track Infrared Sounder (CrIS), a Fourier

transform spectrometer– 2,211 spectral channels

– Photovoltaic Detectors in all 3 bands, 4-Stage Passive

Detector Cooler, On-board internal calibration target

– High-resolution, three-dimensional temperature, pressure,

and moisture profiles

– Facilitates both short- and long-term weather forecasting

– Improves understanding of climate phenomena such as El

Niño and La Niña

CrIS

3October 5, 2018


CrIS Operations

No Science Requirements Changes from JPSS-1 to JPSS-2344October 5, 2018


JPSS-2 and JPSS-3/4 TPMs (1/2)

All TPMs are Compliant

5October 5, 2018


JPSS-2 and JPSS-3/4 TPMs (2/2)

All TPMs are Compliant

6October 5, 2018


Design vs FSRD Requirements Compliance

Predicts Meet Level 2.5 Requirements - No Performance Waivers

Requirement ID Description Compliance

FSRD164 FSRD 164 JPSS satellites CrIS instrument measurements shall satisfy the spectral, radiometric, and spatial attributes identified in Table 4.6-2

ChannelMinimum

Wavenumber Range (cm-1)

Spectral Resolution

(cm-1)Polarization

Accuracy @ 287 K

(%)

Maximum NEdN (mW/(m2-sr-cm-1)

(Notes 1,2)

Maximum NADIR FOV

(km)

Maximum Spectral Uncertainty

(ppm)

Longwave 650 - 1095 0.625 NS 0.45

0.45 @ 670 cm-1

0.15 @ 700 cm-1

0.15 @ 850 cm-1

0.15 @ 1050 cm-1

15 10

Mid-wave 1210 - 1750 0.625 NS 0.58

0.078 @ 1225 cm-1

0.064 @ 1250 cm-1

0.069 @ 1500 cm-1

0.075 @ 1700 cm-1

15 10

Shortwave 2155 - 2550 0.625 NS 0.770.013 @ 2200 cm-1

0.014 @ 2350 cm-1

0.014 @ 2550 cm-1

15 10

Notes:1. The Maximum NEdN requirement for any spectral channels existing between the specified table values may be inferred graphically by straight line segments connecting the specified values.2. The NEdN requirements are applicable to the best 8 of 9 FOVs within each channel FOR.

7October 5, 2018


Radiometric Accuracy in Brightness Temperature

Requirement Varies With Scene Temperature

October 5, 2018 8


SNPP Level 3 Science Waivers

Waiver Number Subject Requirement ID Resolution for J1 Forward

BER-W135R4 Detector nonlinearity CSS835Apply to residual nonlinearity after correction and roll up into

radiometric accuracy requirement

BER-W136R2 NEdN outages CSS3698 Apply to best 8 of 9 FOVs at mission nominal (MN) only

BER-W137R2Short-term repeatability outages

CSS4589(SDRP3566)

Outage due to test limitation (measurement SNR); relax requirement by 25% and apply to MN only

BER-W138R1 ICT emissivity uncertaintyCSS3448, CSS3449,

and CSS3450Improved high-emissivity ICT design; roll up into radiometric accuracy

requirement

BER-W139R1 Encircled energy CSS3463 Relax requirement from 95% to 93%; no impact to science

BER-W169R1 ICT temperature gradient CSS3457 Improved ICT design; roll up into radiometric accuracy requirement

BER-W198R1 Electrical crosstalkCSS1810 and

CSS1829

Improved test design lead to better measurement for J1; change to PCB layout eliminated residual crosstalk for J2 forward. Roll up into

radiometric accuracy requirement.

No Impacts to Science

9October 5, 2018


Only 1 JPSS-1 Level 3 Science Waiver

Mission/Waiver Number

JPSS CCR Number Subject Requirement ID Status

JPSS-1/MA-04-027 472-CCR-14-0793 LW FOV 8 obscuration (chipped singlet) WaiverCrPRD-11202 CrPRD-11196

Approved 1/8/15

No Impact to Level 1 Requirements

10October 5, 2018


JPSS-2 and JPSS-3/4 Level 3 Waivers



JPSS-2-4/MA-04-002 472-CCR-15-1057 OP470A & AMP01 Destructive Single Event Effects WaiverCrPRD-2332 and

CrPRD-2344Approved 12/3/15

JPSS-2/MA-04-004a 472-CCR-16-1121CrIS Radiant Cooler Cover Run-in Test Cycles Waiver Request

CrPRD-5888 Approved 8/12/16

JPSS-2/MA-04-005 472-CCR-16-1175J2 CrIS PA02M Power Operational Amplifier ELDRS Waiver Request to PRD


JPSS-2/MA-04-006 472-CCR-17-1413J2 CrIS OMA Beamsplitter Factor of Safety Waiver Request to PRD

CrPRD-5105 In Review

No Science Performance Waivers to date



JPSS-2-4/MA-04-002 472-CCR-15-1057 OP470A & AMP01 Destructive Single Event Effects WaiverCrPRD-2332 and

CrPRD-2344Approved 12/3/15

JPSS-3-4/MA-04-002 472-CCR-16-1195CrIS Radiant Cooler Cover Run-in Test Cycles Waiver Request


JPSS-3-4/MA-04-003 472-CCR-17-1413J2 CrIS OMA Beamsplitter Factor of Safety Waiver Request to PRD

CrPRD-5105 In Review

11October 5, 2018


Nominal Integration and Test Flow

System integration

Pre-environmental

TVACPER

EMI/EMC Vibration TVAC

PSR

Key Performance Testing is during PETVAC and TVAC

October 5, 2018 12


Key Performance Tests

• 8195937: Radiometric Performance

– Includes observations of External Calibration Target (ECT) at 200 K, 233 K, 260 K, 287 K, 299 K, and 310 K

– Checks NEdN, short-term and long-term repeatability (at 287 K), radiometric accuracy, and nonlinearity

– Performed during pre-environmental TVAC (abbreviated) and system tvac (full)

• 8195940: Spectral calibration and Instrument Lineshape (ILS)

– Includes observations of a blackbody at two temperatures through a full and empty gas cell

– Gases include CO2 and NH3 (LW), CH4 (MW), and CO (SW)

– Used for spectral calibration (CO2, CH4, CO)

• Equivalent to determination of optical axis for the metrology system as well as the as-built focal plane geometry and alignment.

– Also used to determine ILS shape (NH3, CH4, CO)

• FWHM for the sinc function lineshape for each band

• 8195904: FOV, FOR, MTF, and Registration

– Includes slit and spot scans

• Used for Coregistration, FOV diameter, FOV shape match, and encircled energy

External Science Team Involved in Test Design and Analysis

October 5, 2018 13


Key Sensor Changes Affecting Science

Subsystem Change Benefit Mission

Calibration target (ICT)

New design Higher emissivity and improved radiometric accuracy

J1234

ICT Better reference resistors

Improved temperature accuracy over life (47mK to 38 mK 1σ CBE)

J1234

Interferometer (OMA)

New beamsplittercoating supplier

Original supplier did not bid J2 (so far)

OMA New neon lamp supplier

Parts obsolescence J234

Detectors (FPA) Minor design adjustments

Improved yield, consistency, and performance

J234

Small changes driven by necessity or cost-effective improvement

October 5, 2018 14


SNPP and J1 ICT emissivity model

October 5, 2018 15

ICT emissivity improved for J1 forward

0.96

0.965

0.97

0.975

0.98

0.985

0.99

0.995

1

1.005

600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

Eff

ecti

ve E

mis

siv

ity

Wavenumber (cm-1)

ICT Effective Emissivity Retrieval Comparisons (Env Model & Linearity OFF, SWIR Anchor Pt)Selloff Case (SDRAlg2.19, ILS Off) vs. EngPktv31 Retrievals with SDRAlg2.20Eng & ILS On

EngPkt31 for -35mK ICT (-10.688K Viewed Baffle - ICT)

EngPkt31 for -72.5mK ICT (-6.168K Viewed Baffle - ICT)

ITT Selloff (EngPkt10A, ILS Off, -80mK, -7.7K Viewed Baffle - ICT)

SNPP Emissivity model J1 Emissivity model


0.001

0.01

0.1

1

600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

NEd

N (

mW

/m2/s

r/cm

-1)

Wavenumber (cm-1)

J2 Pre-Env TVAC Mission Nominal 287K Side 1 NEdN

FOV1 Std Dev

FOV2 Std Dev

FOV3 Std Dev

FOV4 Std Dev

FOV5 Std Dev

FOV6 Std Dev

FOV7 Std Dev

FOV8 Std Dev

FOV9 Std Dev

287K NEdN Spec

0.001

0.01

0.1

1

600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

NEd

N (

mW

/m2/s

r/cm

-1)

Wavenumber (cm-1)

NPP On-Orbit ICT NEdN Estimate Truncated Resolution 1/22/2012 11:00-11:05 GMT

FOV1 Std Dev

FOV2 Std Dev

FOV3 Std Dev

FOV4 Std Dev

FOV5 Std Dev

FOV6 Std Dev

FOV7 Std Dev

FOV8 Std Dev

FOV9 Std Dev

287K NEdN Spec

SNPP, J1, and J2 Mission Nominal NEdN

October 5, 2018 16

0.001

0.01

0.1

1

600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

NEd

N (

mW

/m2/s

r/cm

-1)

Wavenumber (cm-1)

J1 On-Orbit ICT NEdN Estimate Truncated Resolution 8/28/2018 GMT

FOV1 Std Dev

FOV2 Std Dev

FOV3 Std Dev

FOV4 Std Dev

FOV5 Std Dev

FOV6 Std Dev

FOV7 Std Dev

FOV8 Std Dev

FOV9 Std Dev

287K NEdN Spec

SNPP NOAA-20

JPSS-2(From Harris)


SNPP, J1, and J2 MN Maximum NEdN

October 5, 2018 17

Slight changes due to coatings and detectors

0.001

0.01

0.1

1

600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600

NEd

N (

mW

/m2/s

r/cm

-1)

Wavenumber (cm-1)

CrIS NEdN Trending - Truncated Resolution Mission Nominal 287K ECT Max FOV vs. On Orbit ICT NEdN

287K Spec

NPP Max TVAC4 MN 287K ECT NEdN

NPP On-Orbit ICT NEdN Estimate

J1 Max Final TVAC MN 287K ECT NEdN

J1 On-Orbit ICT NEdN Estimate

J2 Max PreEnv TVAC MN 287K ECT NEdN

(From Harris)


Key Performance Test Changes

Test Change Benefit Mission

Spectralcalibration, ILS

Test at full spectral resolution, add NH3, replace HBr with CO

Improved ILS measurements, improved safety, improved SW spectral calibration

J1234

Spectralcalibration, ILS

Rebuild gas cart Better pressure measurements J234

Radiometric Add NIST ECT TXR calibration

Provide NIST-traceable calibration J12 (so far)

Radiometric Rebuild ECT, new controller

Reduce thermal gradients and transition time

J234

EMI/EMC,Vibe

Moved from Ft Wayne to Rochester

Facility consolidation J234

Bench Replace with PETVAC Improved and more comprehensive baseline performance test

J234

Lessons learned used to improve system test

October 5, 2018 18


TXR, ECT, and J1 CrIS Comparison

October 5, 2018 19

Demonstrates good agreement with 10 µm channel

10 m

5 m

0.00

SW CrISMW CrIS (error bar is 1-sigma T uncertainty)*

* 85mK 3-sigma

{TTX

R(E

CT)

-TTX

R(S

CT)

} -

T ECT

Figure 7b from NIST report

-70.8 mKTECT correction(Predina)

(From UW and NIST)


Summary

• Design is stable

• Lessons Learned from S-NPP, JPSS-1 and JPSS-2 incorporated

• JPSS-3/4 Delta CDR completed June 2018

• SNPP and NOAA-20 CrIS provide consistent measurements

– JPSS-2,3,4 expected to continue this record

• Other talks in this session may speak to this, at least with respect

to SNPP and J1

20October 5, 2018

6.0 flight segment (if part of mpdr) (chris brann/flight ... · sensors and pre-flight testing...

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