Abstract
The Second Generation Global Imager (SGLI) on Global Change Observation Mission–Climate (GCOM-C) satellite empowers surface and atmospheric measurements related to the carbon cycle and radiation budget, with two radiometers of Visible and Near Infrared Radiometer (SGLI-VNR) and Infrared Scanning Radiometer (SGLI-IRS) that perform a wide-band (380 nm–12 µm) optical observation not only with as wide as a 1150–1400 km field of view (FOV), but also with as high as 0.25–0.5 km resolution. Additionally, polarization and along-track slant view observations are quite characteristic of SGLI. It is important to calibrate radiometers to provide the sensor data records for more than 28 standard products and 23 research products including clouds, aerosols, ocean color, vegetation, snow and ice, and other applications. In this paper, the radiometric model and the first results of on-board calibrations on the SGLI-VNR, which include weekly solar and light-emitting diode (LED) calibration and monthly lunar calibration, will be described. Each calibration data was obtained with corrections, where beta angle correction and avoidance of reflection from multilayer insulation (MLI) were applied for solar calibration; LED temperature correction was performed for LED calibration; and the GIRO (GSICS (Global Space-based Inter-Calibration System) Implementation of the ROLO (RObotic Lunar Observatory) model) model was used for lunar calibration. Results show that the inter-comparison of the relative degradation amount between these three calibrations agreed to within 1% or less.
Highlights
Global Change Observation Mission (GCOM) aims to establish and demonstrate a global, long-term satellite-observing system to measure essential geophysical parameters to facilitate understanding of global water circulation and climate change, and eventually contribute to improving future climate projection through a collaborative framework with climate model institutions [1]
We focus on the inter-comparison maximum luminance (Lmax), signal-to-noise ratio (SNR), and instantaneous field of view (IFOV) for of theseeach calibration results on the channel are as shown in Second Generation Global Imager (SGLI)-VNR
As is the case with the telescope (Section 2.1.1), the ratio of these known factors is expressed as follows, and it shows the aging of the photo diode monitor (PD) gain and degradation of the diffuser plate reflectance
Summary
Global Change Observation Mission (GCOM) aims to establish and demonstrate a global, long-term satellite-observing system to measure essential geophysical parameters to facilitate understanding of global water circulation and climate change, and eventually contribute to improving future climate projection through a collaborative framework with climate model institutions [1]. Solar beta angle correction launch,maneuvers the satellite and SGLI instruments were initialized and commissioned for routine operations were performed on January 4, 2018 (within L+2 weeks) and February 8, 2019 (after L+1 and solar and light-emitting diode (LED) calibrations are conducted once every eight days and trending year) and lunar calibration maneuvers were performed each synodic period from. Onboard radiometric calibration for uses remote sensing instruments is ofmany greatsensor importance to assure such as Sea-viewing Wide Field-of-view Sensor (SeaWiFS) [10], MEdium Resolution Imaging the validity of science data products continuously derived from radiometer outputs. Spectrometer (MERIS) [11], Multi-angle Imaging SpectroRadiometer (MISR) [12], and MODerate calibration is a traditional method that uses a natural source (the Sun), and many sensor instruments such resolution Imaging Spectroradiometer (MODIS) [13] have a diffuser panel that reflects the Sun’s as Sea-viewing.
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