GOES-16 ABI On-Orbit Performance

Transcription

1 GOES-16 ABI On-Orbit Performance Xiangqian WU b, Fangfang YU a, Vladimir KONDRATOVICH a, Boryana EFREMOVA a, Xi SHAO a, Robert IACOVAZZI a, Haifeng QIAN a, Hye Lim YOO a, Li ZHU a, and Changyong CAO b a ERT, Inc. Laurel, MD USA b NOAA, NESDIS, STAR, College Park, MD USA 2017 EUMETSAT Satellite Conference 2-6 October 2017, Rome, Italy GOES-16 is not declared operational. The ABI data are currently experimental and still undergoing testing. 1

2 Outline GOES-R ABI introduction GOES-16 Post-Launch Product Test (PLPT) suite list Results from a few PLPTs showcasing ABI instrument, and radiometric and geometric L1b product, performance Summary 2

3 GOES-R Advanced Baseline Imager (ABI) GOES-R ABI Capabilities Compared to GOES-NOP Imager GOES-16 Launch 19 November 2017 Cape Canaveral, FL (Photo Courtesy of NASA) Date GOES-16 Milestones Milestone GOES-R was launched Became GOES Started Post-launch test (PLT) First ABI light for VNIR First ABI IR light First lunar image collection L1b&CMI entered into Beta maturity L1b&CMI entered Provisional maturity 3

4 GOES-R Advanced Baseline Imager (ABI) Nominal Scan Modes Full Disk ABI Scan Mode 4: 1X (5 minute Full Disk) CONUS ABI Scan Mode 3: 30X (30-second Meso) 3X (5 minute CONUS) 1X (15 minute Full Disk) Meso On-board Radiometric Calibration Solar diffuser for VNIR bands Temperature-controlled blackbody for IR bands Spaceview Improved Radiometric and Spectral Requirements SNR for Visible from 100 to 300 NEdT for IR at 300K from 0.35K to 0.1K SRF Narrower by ~half to optimize applications 4

5 ABI Captures the 2017 Solar Eclipse August 21, 2017 Eclipse - GOES-16 Full Disk - Full Color UTC 5

6 GOES-R ABI L1b Post-Launch Product Test (PLPT) Suite Post-Launch Product Test ID Numbers and Short Titles ABI-L1b-PLPT-01: IR Validation IASI & SNPP-CrIS ABI-L1b-PLPT-02: IR Validation CRTM ABI-L1b-PLPT-03: Restricted Zone Performance ABI-L1b-PLPT-04: VNIR Validation VIIRS Inter-calibration ABI-L1b-PLPT-05: VNIR Validation Desert ABI-L1b-PLPT-06: VNIR Validation Reflectance Versus Scan (RVS) ABI-L1b-PLPT-07: Instrument Performance Monitoring ABI-L1b-PLPT-08: AD Converter ABI-L1b-PLPT-09: Low Light SNR ABI-L1b-PLPT-10: Image Navigation Assessment and Trending ABI-L1b-PLPT-11: Image Co-Registration Assessment and Trending ABI-L1b-PLPT-12: Image Stitching Assessment and Trending ABI-L1b-PLPT-13: VNIR Validation - DCC ABI-L1b-PLPT-14: Detector Uniformity Stability: Desert NSS ABI-L1b-PLPT-15: Validation: NSS during SNO ABI-L1b-PLPT-16: L2 Validation Support: NSS: Ocean Monitoring ABI-L1b-PLPT-17: Instrument Characterization: Lunar NSS ABI-L1b-PLPT-18: Detector Uniformity: NSS for Selected Targets ABI-L1b-PLPT-19: Day 1 Solar Calibration Coefficients ABI-L1b-PLPT-20: IR Spatial Uniformity via Space Looks 6

7 ABI-L1b-PLPT-07: Instrument Performance Monitoring (IPM) Channel Statistics Detector Statistics 15-min Interval Statistics for 2 Days 60-min Interval Statistics for 30 Days 6-hour Interval Statistics for 1 Year 3-day Interval Statistics for Mission Life 7

8 ABI Anomaly Detection Using the IPM Max noise out of the scale 8

9 ABI Anomaly Detection Using the IPM Noise beyond specifications 9

10 ABI Anomaly Detection Using the IPM Channel 10 Detector 313 Spaceview Stats Channel 10 Detector 313 Blackbody Stats 10

11 ABI Instrument Performance Detection Using the IPM Example: GOES-16 ABI NEDT Overall Summary 0.35 NEDT (K) NEDT 300K Mean Measured 300K GOES-16 ABI Channel Number Better than expected noise performance. 11

12 ABI-L1b-PLPT-04: VNIR Validation Inter-calibration with S-NPP/VIIRS Reflectance Bias Accuracy Requirement On-Orbit Bias GOES-16 ABI Channel Number Reasonably accurate Larger biases under investigation 12

13 ABI-L1b-PLPT-01: IR Validation Intercalibration with Metop/IASI and S-NPP/CrIS Brightness Temperature Bias (K) Accuracy Requirement On-Orbit Bias GOES-16 ABI Channel Number Stable with better than expected performance. 13

14 Change in IASI Processing? 14

15 ABI IR Bands Radiance (Full Disk) Compared with CrIS & IASI Minor, but statistically significant change since 2 August Not because of position shift Started later (7 August 2017). No corresponding change in CrIS (benefit of multiple LEOs) May be due to NETOP-B IASI onboard processing change. Stable mean. Small stdv about the mean. Small mean diff (~0.1K cooler). 15

16 Image Navigation and Registration (INR) Pioneering a new approach to imager navigation from geostationary orbit: Kalman Filter (KF). Instead of point camera carefully and take picture, we now take picture and then carefully determine pointing We monitor the major parameters of navigation for ABI Full Disk (FD) image: East-West and North-South navigation residuals Channel-to-Channel Registration (CCR) Swath Registration (SR) Frame-to-Frame Registration (FFR) Within Frame Registration (WIFR) 16

17 ABI-L1b-PLPT-10: Image Navigation Assessment and Trending X-Residuals Y-Residuals X- and Y-Residuals for Channels 1-5 usually less than 5 microradians X- and Y-Residuals for Channels 6-16 usually less than 20 microradians *28 microradians = Sub-Satellite Point 17

18 ABI-L1b-PLPT-11: Image Co-Registration Assessment and Trending Overall N-S E-W Mostly acceptable, but doesn t always satisfy expectations. 18

19 Geometric Calibration Navigation Errors of Principal Bands (CWG evaluation) Band (µm) Required (µrad) Measured (µrad) EW NS EW NS GOES-16 ABI INR Since 1 March Meets Specifications in Most Cases Co-Registration Errors of Principal Band Pairs (CWG evaluation) Band (µm) Required (µrad) Measured (µrad) EW NS EW NS

20 Summary CWG was able to handle a tremendous volume of data and provide assessment of GOES- 16 ABI on-orbit performance. GOES-16 ABI on-orbit condition is excellent. Data processing algorithm anomalies are identified and mostly resolved. Look-up tables are for the most part corrected. IR channel calibration is accurate and stable. VNIR channel calibration performance is overall acceptable. Though pioneering a new navigation approach was expected to be tough, an impressive progress was achieved with further improvements expected to come every month. For further information, see new and still evolving NOAA/NESDIS/STAR GOES Calibration website ( Acknowledgements: Support by NOAA GOES-R CWG 20

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