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首页> 外文期刊>Journal of geodynamics >Aliasing effect of high-frequency mass variations on GOCE recovery of the earth's gravity field
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Aliasing effect of high-frequency mass variations on GOCE recovery of the earth's gravity field

机译:高频质量变化对地球重力场GOCE恢复的混淆效应

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摘要

The European Space Agency GOCE space gradiometer mission is anticipated to produce the static gravity field model of the Earth with an unprecedented geoid accuracy of several centimeters with a resolution of 65 km (130 km wavelength) or longer. In a sun-synchronous near-polar orbit and at a mean altitude of 250 km, GOCE senses not only static gravitational forces but also tides and other temporal gravity field signals, including gravitational perturbations due to mass redistribution within the atmosphere, ground water, ocean, cryosphere, and the solid Earth. In this study, we examine the effect of high-frequency temporal gravity field sources (ocean tides, atmosphere, and hydrological mass variations) on the GOCE satellite-to-satellite tracking and gradiometer measurements and on the corresponding geopotential model recovery complete to degree and order 300. We conduct a simulation study to quantify the effects of model errors and the associated temporal aliasing on GOCE gravity field recovery. The geoid error due to combined effects of ocean tides, atmosphere and hydrologic mass variations is 2 mm (RMS) and 1-2 cm (maximum) with a resolution of 65 km, and not a limiting error source for GOCE gravity recovery.
机译:预计欧洲航天局GOCE空间梯度仪任务将产生地球的静态重力场模型,其大地水准面精度达到几厘米,分辨率为65 km(波长130 km)或更长。在太阳同步近极轨道上,平均高度为250 km,GOCE不仅可以感应静态引力,还可以感应潮汐和其他时间重力场信号,包括由于大气,地下水,海洋中物质的重新分布而引起的引力扰动。 ,冰冻圈和固体地球。在这项研究中,我们研究了高频时间重力场源(潮汐,大气和水文质量变化)对GOCE卫星到卫星的跟踪和坡度仪测量的影响,以及对相应的地势模型恢复程度和程度的影响。 300号订单。我们进行了仿真研究,以量化模型误差和相关的时间混叠对GOCE重力场恢复的影响。由于海洋潮汐,大气和水文质量变化的综合影响而产生的大地水准面误差为2 mm(RMS)和1-2 cm(最大),分辨率为65 km,这并不是GOCE重力恢复的局限性误差源。

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