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SATELLITE-TO-SATELLITE LASER TRACKING FOR A NEXT GENERATION GRAVIMETRIC MISSION

机译:下一代重力导弹任务的卫星到卫星激光跟踪

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A mission for monitoring the variations of Earth's gravityrnfield at high resolution over a long time period hasrnbeen defined by Thales Alenia Space Italia (TAS-I)rnwithin the "Laser Doppler Interferometry Mission forrnDetermination of the Earth's Gravity Field" study forrnthe European Space Agency (ESA). The mission exploitsrnthe use of a heterodyne laser interferometer forrnthe fine measurement of the displacement between twornsatellites flying in formation at low altitude. Startingrnfrom the geophysical phenomena to be investigated, thernrequirements on the main mission elements (orbit, satelliternformation, payload instruments) have been derivedrnwith the support of a scientific consultant team. A formationrnof two co-orbiting satellites flying at a 10 kmrnrelative distance on a 325 km altitude sun-synchronousrnorbit was found in theory suitable to enable the determinationrnof the geoid height variation with an error = 0.1rnmm/year at ? = 200, provided to measure the intersatelliterndistance with an error spectral density ≤5rnnm/Hz~(1/2), and the non gravitational accelerations on thernsatellites with an error spectral density ≤10~(-11) m/s~2/Hz~(1/2).rnFollowing that study, two contracts have been awardedrnby ESA to TAS-I for starting the technological developmentrnof the optical metrology (laser interferometerrnand devices for measuring the relative angular misalignmentrnand lateral displacement of the two satellites),rninvestigating the mission control issues (formation,rndrag-free, attitude, laser beam pointing), realizing a missionrnsimulation tool, and assessing the feasibility ofrnalternative scenarios. This paper summarizes the mainrnresults of these two on-going studies.
机译:Thales Alenia Space Italia(TAS-I)已在“激光多普勒干涉测量任务确定地球重力场”研究中为欧洲航天局(ESA)定义了长期监测高分辨率重力场的任务。 )。该任务利用外差激光干涉仪来精确测量低空飞行的两个卫星之间的位移。从要研究的地球物理现象开始,在科学顾问团队的支持下,得出了对主要任务要素(轨道,卫星信息,有效载荷仪器)的要求。理论上发现,在325 km高度的太阳同步主轨道上以相对距离10 km飞行的两个同轨卫星,适合于确定大地水准面高度变化,误差= 0.1rnmm / year。 = 200,用于测量误差谱密度≤5rnnm/ Hz〜(1/2)的星际间距和误差谱密度≤10〜(-11)m / s〜2 / Hz的卫星上的非重力加速度〜(1/2).rn在这项研究之后,ESA授予了TAS-I两份合同,以启动光学计量技术(激光干涉仪和用于测量两颗卫星的相对角度未对准和横向位移的设备),研究任务控制问题(形成,无阻力,姿态,激光束指向),实现任务模拟工具并评估替代方案的可行性。本文总结了这两项正在进行的研究的主要结果。

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