Abstract | ||
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The Earth-viewed images acquired by the space probe OSIRIS-REx during its Earth gravity assist flyby maneuver on 22 September 2017 provided an opportunity to radiometrically calibrate the onboard NavCam imagers. Spatially-, temporally-, and angularly-matched radiances from the Earth viewing GOES-15 and DSCOVR-EPIC imagers were used as references for deriving the calibration gain of the NavCam sensors. An optimized all-sky tropical ocean ray-matching (ATO-RM) calibration approach that accounts for the spectral band differences, navigation errors, and angular geometry differences between NavCam and the reference imagers is formulated in this paper. Prior to ray-matching, the GOES-15 and EPIC pixel level radiances were mapped into the NavCam field of view. The NavCam 1 ATO-RM gain is found to be 9.874 x 10(-2) Wm(-2)sr(-1)mu m(-1)DN(-1) with an uncertainty of 3.7%. The ATO-RM approach predicted an offset of 164, which is close to the true space DN of 170. The pre-launch NavCam 1 and 2 gains were compared with the ATO-RM gain and were found to be within 2.1% and 2.8%, respectively, suggesting that sensor performance is stable in space. The ATO-RM calibration was found to be consistent within 3.9% over a factor of +/- 2 NavCam 2 exposure times. This approach can easily be adapted to inter-calibrate other space probe cameras given the current constellation of geostationary imagers. |
Year | DOI | Venue |
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2019 | 10.3390/rs11222717 | REMOTE SENSING |
Keywords | DocType | Volume |
calibration,OSIRIS-REx,NavCam,ray-matching,SBAF,GOES-15,DSCOVR-EPIC | Journal | 11 |
Issue | Citations | PageRank |
22 | 0 | 0.34 |
References | Authors | |
0 | 8 |
Name | Order | Citations | PageRank |
---|---|---|---|
David R. Doelling | 1 | 91 | 18.03 |
Konstantin V. Khlopenkov | 2 | 0 | 0.34 |
Conor O. Haney | 3 | 23 | 6.73 |
Rajendra Bhatt | 4 | 57 | 10.56 |
Brent Bos | 5 | 0 | 0.34 |
Benjamin R. Scarino | 6 | 45 | 9.53 |
Arun Gopalan | 7 | 39 | 8.28 |
Dante S. Lauretta | 8 | 0 | 0.68 |