Abstract
By contrast to one on low earth orbit(LEO),high spatial resolution optical imaging earth observation satellite on geostationary orbit has some remarkable advantages with much higher time resolution,more wider imaging field、much longer target tracking and monitoring time,and now is becoming one of important development foucs. Corresspondently GEO optical imaging satellite has much higher control accuracy requirement with stability than LEO, greatly promote development difficulties.The paper makes dicussion for key structure influence factors on attitude & structure stability for image quality guarantee under complex space circumstance and conducts stimulation to account for the their effect,finally present some solution options.
Highlights
GEO earth observation optical imaging satellite could levitate above the observation area and its centroid keep still relative to earth, it has a remarkable advantage of high time resolution over one on low earth orbit (LEO), and higher efficiency of using
Europe has been developing a series of projects about GEO optical imaging satellite such as GEO-Afiraca with 25m-spatial resolution, Geo-Oculus with 10m-spatial resolution, HRGeo concept deisgning with over3m-spatial resolution (ASTRUM)
Typical on-obrital configuration of GEO high spatial resolution optical imaging satellite is illustrated in Fig 1.The spacecraft equipped with large dimension camera, solar-array, picture data transmission antenna etc.The camera with large optical bench usually is mounted above platform, and its optical axis points toward earth. salor–panels are allocated symmetrically along Y-direction.To avoide obstruction of field of view,picture data transmission antenna and salor-panels have larger size generally.As for 10m spatial resolution,the primary mirror diamater is estimated about over 3m, length of lens hood subjected to duration of sunlight entering field of optical view, may exceed over 10m probably
Summary
GEO earth observation optical imaging satellite could levitate above the observation area and its centroid keep still relative to earth, it has a remarkable advantage of high time resolution over one on low earth orbit (LEO), and higher efficiency of using. (arcsecend) of peak-peak value for high frequency micro-vibraton, it is far greater than LEO optical satellite,and enhanced the development difficulties greatly.Over past years, some of major spacecraft manufacturers or enterprises have been strenthening the technical research and found various ways to minimize micro vibrationa and thermal coupling, shch as Hubble telescope has token the measure of assembly bearing ball more exactly and installation of isolator device for each attitude control actuator to attenuate disturbance influence on picture quality.The attitude accuracy of Chandra X ray space telescope has been improved obviously by using of isolation system. Based on MTF analysis and identification of key structure influence factors for image quality guarantee under complex space circumstance and taking a 10m resolution GEO remote sensing satellite as a example, this paper conducts some numerical stimulation with influence effect for the identified structure affecting factors, and presents some strategies or suggestions for mitigation micro-vibration and mechanical & thermal interaction between platform and camera
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