Advanced Land Observing Satellite (ALOS): enabling technologies and platform performance

Iwata, Takanori; Ishida, Haruyuki; Osawa, Yuji

doi:10.1117/12.801072

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…The 3D model of the front optical system of AOTF imaging spectrometer in Trace Pro is shown schematically below: The main structure of the optical machine is a truss structure, which has the advantage of high strength and lightweight [9] . The structural model of the optical machine constructed using Pro/E software is shown in Figure 2a) below, and the optical machine model was built in Trace Pro as shown in Figure 2b) below: In order to analyse of stray light, once a solid model has been created in Trace Pro, the surface properties of the model need to be specified.…”

Section: Optical System and Optomechanical Modelingmentioning

confidence: 99%

Analysis and suppression of stray light in the pre-optical system based on AOTF imaging spectrometer

chang

zhao

Qiu

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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During the observation of the ground by the space optical system, stray radiation will enter and degrade the imaging quality of the optical system. In order to improve the imaging effect of the system, this paper takes the front optical system of an AOTF imaging spectrometer as an example, designs and builds a truss optical machine structure in Pro/E, and completes the optical machine modelling in Trace Pro. The stray light paths were analysed by ray tracing simulation and the important surfaces of the optical machine were identified. The design of external hood and light-blocking rings and the design of the light baffle and the alienated inner hood were carried out respectively. Numerical calculations of PST curves for off-axis angles from 5 °to 80 °were carried out for each of the three cases by ray tracing without stray light suppression, using only external hood suppression, and using internal and external suppression measures. After comparative analysis, it was determined that the PST value for the use of all strays light suppression measures at an angle greater than 30°was less than the stray light level target value of 10 -7 by two orders of magnitude and less than the PST of the optical machine without stray light suppression by four orders of magnitude, verifying that the stray light suppression method in the paper works well. INTRODUCTIONStray light refers to non-imaging light other than imaging light, through normal or abnormal methods to the image plane. Space optical systems generally operate in a very complex environment, where radiation sources such

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Section: Optical System and Optomechanical Modelingmentioning

confidence: 99%

Analysis and suppression of stray light in the pre-optical system based on AOTF imaging spectrometer

chang

zhao

Qiu

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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“…The Advanced Optical Satellite (ALOS-3) 1,2,3 is a successor to the optical mission of the Advanced Land Observing Satellite (ALOS) "Daichi". ALOS was successfully operated on orbit for more than five years (2006 -2011) and ALOS's three sensors acquired about 6.5 million scenes of Earth, which contributed to a variety of fields including cartography, regional observation, and disaster monitoring 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Development of the wide-swath and high-resolution optical imager onboard advanced optical satellite (ALOS-3)

Watarai

Katayama

Niwa

et al. 2019

International Conference on Space Optics — ICSO 2018

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JAXA has developed the Advanced Optical Satellite (ALOS-3) as a successor to the optical mission of the Advanced Land Observing Satellite (ALOS) "Daichi" (2006-2011) since FY 2016. The wide-swath and high-resolution optical imager (WISH) is the main instrument of ALOS-3 and equipped with a panchromatic (Pa) band and 6 multispectral (MS) bands. For the optics of WISH, a large off-axis four mirror anastigmat type has been selected to achieve both highresolution (0.8 m Pa, 3.2 m MS) and wide-swath (70 km). The proto-flight model (PFM) of all mirrors has already in the precision polishing process, and highly accurate measurements of large off-axis aspherical surfaces (primary and tertiary mirror) are carried out both in a contact and a non-contact method. The verification concerning the high precision assembly of the large off-axis optical system was also carried out using the structural model which is manufactured with the same design for the PFM. Manufacture and test of the PFM of WISH would be conducted over the next one year and the PFM would be delivered to the ALOS-3 satellite system within FY 2019. ALOS-3 is scheduled to be launch from Tanegashima Space Center in FY 2020.

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“…The image quality of high-resolution optical system will be degraded with jittering of its axis caused by the motion of satellite platform. During the satellite moving on orbit, the attitude stability of the satellite platform will be disturbed by space environment, and also by some motion parts of the platform such as moment flywheel, scanning motor, solar array's stepping driving, and antenna's servo driving [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Image quality degradation of high-resolution optical system caused by disturbance of satellite platform

Liang

Wang

2011

SPIE Proceedings

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During satellite moving on orbit, effect of disturbance of satellite platform motion on optical system cannot be neglected.The influence on image quality of high-resolution optical system caused by satellite platform motion was analyzed in this paper. First, as linear, sinusoidal and random motion are three kinds of fundamental motion mode of satellite platform, the effects of the disturbance of linear, sinusoidal and random motion on Modulation Transfer Function (MTF) of optical system were simulated respectively. Second, based on the simulation results, conclusion that the Modulation Transfer Function (MTF) was degraded in various degrees under different modes of motion disturbance was obtained. To improve the axis stability of optical system for a high-resolution image, a coupler was researched and installed between the satellite platform and the optical imaging system to attenuate the disturbance from the satellite platform, and adaptive optics correction was adopted to correct the residual disturbance effect in real-time. By combining the coupler and adaptive optics correction, the high-resolution imaging was guaranteed effectively.

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Advanced Land Observing Satellite (ALOS): enabling technologies and platform performance

Cited by 8 publications

References 7 publications

Analysis and suppression of stray light in the pre-optical system based on AOTF imaging spectrometer

Analysis and suppression of stray light in the pre-optical system based on AOTF imaging spectrometer

Development of the wide-swath and high-resolution optical imager onboard advanced optical satellite (ALOS-3)

Image quality degradation of high-resolution optical system caused by disturbance of satellite platform

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