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卫星高度计定标现状 总被引:1,自引:0,他引:1
定标是卫星高度计数据精度的重要保障,随着高度计卫星HY-2A的发射及后续卫星组网规划,中国将获取长时间序列的自主高度计观测资料,定标对数据精度和长期一致性的重要性日益凸显。总结了卫星高度计定标常用技术方法的国内外研究进展和现状,阐述了中国自主海上定标场的建设和应用情况,重点对青岛千里岩定标场的大地基准测量、地壳沉降监测及HY-2A等多颗卫星高度计的定标结果进行总结分析,并对规划建设中的珠海万山海上综合定标场和中国沿海定标场网做了介绍。此外利用GNSS水汽反演技术对星载微波辐射计观测的大气湿延迟开展了精度检核实验,得到了Jason-2卫星2010年—2016年微波辐射计大气湿延迟观测精度,证明了利用中国沿海GNSS连续运行站标定星载微波辐射计大气湿延迟的可行性,对于充分了解和认识卫星高度计定标的研究现状和发展趋势有一定的借鉴和指导意义。 相似文献
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本文针对测高卫星轨道及地面轨迹的独有特点,较系统地研究了卫星测高数据处理的理论与方法,内容包括测高卫星径向轨道误差的时域特征分析与空域特征分析、共线轨迹与交叉点分布等的谱特征、整体求解法的研究以及TOPEX测高数据的初步计算与分析。(1)系统论述了卫... 相似文献
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无场几何定标是未来多波束激光测高卫星面临的一个关键问题。本文针对高分七号(GF-7)线性体制全波形激光测高仪,提出了一种基于地形和波形匹配的无场分步定标方法。在深入分析高分七号卫星激光测高仪特点的基础上,构建了严密几何定位模型,采用公开版的地形参考数据和某地区1∶2000高精度的DOM和LiDAR-DSM基础地理信息成果,开展了在轨无场几何定标试验,显著提高了高分七号卫星激光测高数据精度。在2020年上半年受新冠肺炎影响未进行外场定标期间,有效解决了激光测高数据处理无定标参数的实际困难。本文对无场定标结果与高分七号实际外场定标结果进行对比验证,结果表明,无场定标结果与实际落点位置的平面误差为11.597±3.693 m,最小值为7.115 m,平坦地区高程精度优于0.3 m,虽然略低于外场定标结果,但能满足1∶10 000高程控制点测量需求。 相似文献
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针对卫星测高技术反演海洋重力场需要解算格网垂线偏差,不同的格网化方法影响垂线偏差的解算精度与空间分辨率的问题,结合Shepard格网化方法与沿轨最小二乘方法的优势提出了一种新的格网化方法,即基于Shepard 权函数的沿轨最小二乘方法.采用CryoSat-2卫星约7年的数据,选取中国黄海和南海及其周边海域作为研究区域,分别利用基于交叉点的Shepard法、距离加权沿轨最小二乘法和基于Shepard权函数的沿轨最小二乘法解算1'×1'格网的垂线偏差.将不同方法得到的结果与EGM2008模型的垂线偏差进行比较,利用本文提出的方法解算的1'×1'格网垂线偏差精度最高.研究表明,在基于Shepard权函数的沿轨最小二乘方法在垂线偏差格网化中是可靠的,且该方法可获得高精度结果. 相似文献
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Mean sea surface heights and residual radial orbit errors are estimated simultaneously in a single global crossover adjustment
of multiple cycles of satellite altimetry data. The rank defect inherent in the estimation problem is explicitly identified
and treated in various ways to give solutions that minimise (in norm) either orbit errors or mean sea surface heights. The
rank defect gives rise to geographically correlated orbit error, consisting of those components of the orbit error or those
components of the map of sea surface heights which fall within the nullspace of the estimation problem and which cannot be
distinguished as orbit error or ocean signal. We show that, in the case of Topex/Poseidon data, the geographically correlated error consists largely of long-wavelength and long-period sea surface fluctuations, which
in the past has often been assigned as orbit error.
Received 11 September 1995; Accepted 2 September 1996 相似文献
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R. D. Ray 《Journal of Geodesy》2007,81(4):247-257
The ERS-1, ERS-2 and Envisat series of satellite altimeters provide the only extensive datasets that could conceivably be
usedto constrain ocean tide models in high latitudes. Their sun-synchronous sampling, however, severely limits theobservations
of solar tides, especially the principal semidiurnal S2 constituent. The Munk–Cartwright response method is anatural choice when attempting to analyze sun-synchronous data. The
present study examines various ways a response analysis might be implemented to extract tides from ERS data. Admittances expressed
as simple linear or constant functions of frequency cansometimes improve estimates over standard parameterizations, especially
if done in conjunction with a reasonably accurate priorsolution. Some form of regularization, such as ridge regression, is
also shown to improve the estimates. The approach provesbeneficial in a test for the southern Indian Ocean tides. It offers
some promise for regions otherwise void of usefulobservations. 相似文献
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The crossover adjustment plays a central role in the processing of satellite altimeter measurements. The usual procedure
is to form sea surface height differences at crossover points, solve for the radial orbit error (with due attention to the
singular nature of the estimation problem) and then to construct altimetric sea-level maps using the mean sea surface heights
at the crossover points. Our approach is very different, to make direct use of measurements at crossover points without differencing
and to estimate simultaneously orbit parameters, mean sea surface height and sea surface height variability in a single, unified
adjustment. The technique is suited for repeat data over an area small enough that adjoining passes may be considered to be
parallel and to permit the solution of a set of linear equations of dimension equal to the number of crossover points. The
size of the numerical problem is almost independent of the number of repeat cycles of the altimeter mission. Explicit recognition
is given to the rank defect of the least-squares estimation problem; we show that, for an orbit model with r parameters, the rank defect of the local crossover problem is exactly r
2. The defect may be overcome by choosing an appropriate set of constraints – either giving a best fit of mean sea surface
heights to a reference surface, or minimising orbit parameters, or a minimum norm solution in which both mean sea surface
heights and orbit parameters are minimised. There is no need to choose a reference pass, all passes are treated equally and
data gaps are easily accommodated. Numerical results are presented for the south-western Indian Ocean, based on the first
2 years of altimeter data from the Geosat Exact Repeat Mission.
Received: 31 May 1996 / Accepted: 19 April 1997 相似文献