MOS-1センサーデータの外部要因歪の事前評価

抄録

Marine Observation Satellite-1 (MOS-1) is the first Japan's earth observation satellite and will carry three different type sensors, i.e., Multispectral Electronic Self Scanning Radiometer (MESSR), Visible and Thermal Infrared Radiometer (VTIR), Microwave Scanning Radiometer (MSR) and Data Collection System Transponder (DCST) as the mission instruments.
Radiometric accuracy of the sensors were assessed taking into account sea-surface condition, influences due to sun-glitter, atmospheric effects and so on. Consequently it was found that the followings are noticeable.
(1) Maximum and minimum radiance values and S/N ratio of MESSR are nearly equal to those of Landsat MSS.
(2) The maximum influence of sun-glitter on MESSR data under the condition of 7(m/s) of wind speed over the sea surface and 10 o'clock of Local Mean Time ; LMT of the satellite orbit is approximately 2(%) in termes of the equivalent reflectance of sun-glitter while that for 11 o'clock of LMT is about 7(%).
(3) Influence of sun-glitter on VTIR band 1 data, under the condition of 7(m/s) of wind speed over the sea-surface and 11 o'clock of Local Mean Time; LMT of the satellite orbit (in worst case) is approximately 9(%) in terms of equivalent reflectance of sun-glitter. Meanwhile those of VTIR band 2, 3 and 4 are negligibly small.
(4) Due to the influence of the lim-darkening, input radiance of VTIR in the observation with the maximum scanning angle is reduced by 38(%) comparing with that for nadir observation.
(5) Influence of polarization change due to antenna rotation on brightness temperature of MSR antenna was approximately 2.8(%) in typical case.
(6) The percentage ratio of the contribution of the radiation from land through side-lobe of MSR antenna is less than 12.3(%).