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1.
卫星测高中的垂线偏差法 总被引：6，自引：0，他引：6
卫星测高中的垂线偏差法是当前利用卫星测高技术研究海洋重力场的最优方法，包括利用卫星测高数据计算垂线偏差和利用该垂线偏差确定海洋重力场两部分。研究了Sandwell、Olgiafi、Hwang测高垂线偏差的计算方法和Molodenskii、Hwang利用测高垂线偏差确定海洋重力场的基本原理，分析比较了上述方法的异同，为科学地利用卫星测高资料反演海洋重力场提供理论依据。 相似文献
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粗差探测是评价船载重力测量数据成果质量的重要内容。卫星测高反演重力场技术提供了海域全覆盖的重力场数值模型,其精度水平已满足探测船载重力测量数据粗差的精度要求。以卫星测高反演重力场模型为基础,提出了基于窗口移动中误差模型探测船载重力测量粗差的数据处理方法,其基本思路是:以卫星测高反演重力场数值模型作为背景场,计算船载重力测点处的测高重力值的差值,以差值作为输入量,等权构建中误差背景场,以开窗中误差背景场作为参考,按照平差思想探测船载重力测量数据的粗差。实验结果表明,依据本文方法能有效探测船载重力测量数据的粗差。 相似文献
3.
卫星测高在海洋测绘中的应用 总被引：1，自引：0，他引：1
研究了卫星测高数据在海山探测以及无图海域水深预测方面的应用。介绍了匹配滤波法检测海山的理论与方法，并研究了反演海底地形时的重力导纳理论以及滤波窗口和滤波函数的选择。实践表明，利用卫星测高数据反演海底地形的精度可优于水深的10％。 相似文献
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近年间，除上述国外机构外，国内的大地测量学、地球物理学领域的专家、学者，特别是海洋测绘、海洋地学的工程人员对卫星测高资料的理论与实用方面也做过大量研究，并取得丰硕成果。总的说，对中国各海域的卫星测高数据做了处理、反演和区域地球物理与地质解释。 相似文献
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利用苏门答腊附近海域T/P、Jason-1测高卫星近20年的海面高连续观测资料,分别计算了该区域(80°E~105°E,5°S~20°N)在2004年苏门答腊大地震前后的海面高变化趋势,并与该区域对应时间段GRACE重力卫星反演的地表质量迁移结果进行比较。研究结果表明,由卫星测高观测资料估算的震区地震前后海平面趋势的变化与卫星重力反演结果基本一致。由于卫星测高沿轨观测具有高精度、高时空分辨率的特性,卫星测高资料估算的海平面趋势变化可以更为准确地反映震区海平面变化的局部特征。还对该区域震后形变特征进行了初步分析。 相似文献
8.
《中国海洋大学学报(自然科学版)》2017,(6)
利用高精度卫星测高数据反演重力是获取海洋重力异常的重要方法。本文介绍了自2008年以来新一代高精度测高卫星的相关信息。在此基础上,联合多颗新型卫星,进行交叉点平差,通过中心差分代替常规Sandwell方法计算垂线偏差,利用改进的逆Vening-Meinesz法和Stokes数值反解法对西太平洋某区域进行了重力场反演。反演结果与NGDC提供的船测重力值比较表明,逆Vening-Meinesz法计算误差小于Stokes数值反解法。通过添加随机噪声数值实验,进一步证明逆Vening-Meinesz法对于测高数据误差的抗差能力更强,在研究区的重力异常计算结果可信度较高。 相似文献
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《海洋测绘》2002,(6)
综 述卫星测高原理及其应用 (1— 5 7)卫星测高在确定地球重力场中的应用 (2— 5 9)卫星测高在海洋学中的应用 (3— 5 8)卫星测高在海洋测绘中的应用 (4— 5 8)多波束测深系统的现状与发展趋势 (5— 3)沿岸水深测量技术方法的探讨 (6— 6 0 )海洋测量卫星测高资料在反演海底地形中的应用 (1— 3)南海海底地形的卫星测高数据反演 (1— 8)天津港精密水深测量的实现 (1— 30 )多波束系统的参数误差判断及校正 (1— 33)海洋测深中时移和偏移效应综合分析与改正 (2— 9)南海海域岛屿高程基准确定与计算 (2— 14 )磁偶极子磁场空间分布模式 (2— … 相似文献
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高度卫星定轨精度对其测高精度数据在海洋应用中的影响 总被引：2，自引：0，他引：2
卫星测高术是７０年代发展起来的一项新技术，到目前为止国外已陆续发射了七颗载有高度计的卫星，高度计卫星定轨的精度对测高数据的应用有很大影响，本文概述了卫星高度计测高数据在海洋应用上的一些结果、影响轨道的因素、测轨方法和轨道精校正方法，最后根据现有卫星轨道校正数据得到卫星轨道误差与校正精度的关系式，据此分析了轨道计算误差地卫星高度计测高数据在海洋应用中的影响。 相似文献
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Pan Jiayi Wang Junqin Wang Yanfeng Zhang Xinmei Yuan Yeli Zheng Quan''an 《海洋学报(英文版)》1999,18(4):523-533
INTRODUCTIONThegeoidistheiargeopotentials~econfidingmostlywiththemeanseasurfaceandisdenotedastheheightrelativetotheidealelliPSes~eoftheearth.Thegeoidundulationsinglobalaceareupto100m.TheunevenstructureOftheearthgivesrisetotheunevenfeatureofthecitysot... 相似文献
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We have obtained regression relationships between vertical components of gravity anomalies in tropical cyclone areas and some cyclonic characteristics. These regressions are more pronounced in territories where negative gravity anomalies are prevalent. Numerical experiments are performed for the cyclonic zone of the northwestern Pacific and western Atlantic. In the zone of the western Atlantic, the main focus is on cyclones entering to the terrestrial part of the United States. We conclude that under some conditions, gravity anomalies can affect the characteristics of tropical cyclones. 相似文献
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采用二维小波变换与多尺度分解技术，对南黄海布格重力异常进行了分解，得到了自地表至莫霍面深度范围的不同尺度的密度体所产生的重力异常，从而获取不同切割深度的断裂构造、沉积基底及莫霍面所产生的重力异常。结果表明：该区断裂相互交错、切割深度不一，有明显的多期活动的迹象；小波变换的四阶异常细节主要由沉积基底面起伏所引起的，而小波变换四阶异常逼近主要反映了该区莫霍面起伏特征。 相似文献
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A set of 103 997 free air gravity anomalies in 6′x 10′ blocks has been compiled covering Europe including the Mediterranean Sea, North Sea, Norwegian Sea, Baltic Sea and parts of the North Atlantic Ocean. Concerning sea areas, this data set is based on a collection of point free air gravity anomalies. Anomalies for land areas have been compiled resp. computed from free air gravity anomaly maps or Bouguer anomaly maps and partly from supplied mean values of convenient small block size. Remaining gaps have been interpolated by means of least squares prediction filtering. The precision of the compiled mean free air gravity anomalies is estimated to ±7 mgal, verified by a comparison of independent gravity anomaly sets. 相似文献
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M. E. Artemjev T. M. Babaeva V. O. Mikhailo I. E. Voydetsky 《Marine Geophysical Researches》1984,7(1-2):129-148
All anomalous masses of the Earth are reflected in the free air gravity anomalies and the geoidal undulations. The low viscosity
of the asthenosphere significantly reduces the possibility of existence of density inhomogeneities in the layer. This fact
provides some physical basis for the separation of the gravity field anomalies. It has been shown by power spectrum analysis
of the free air anomalies and gravity field of isostatically compensated model of the lithosphere for the North Atlantic and
adjacent areas of America, Europe and Mediterranean, that the attraction of isostatically compensated model is significant
for any wave length of the field. It causes significant error in the interpretation if long wavelength constituents of the
free air gravity anomalies are considered as a field of deep anomalous masses. The isostatic anomalies und isostatic geoid
are free from the influences of isostatically compensated lithosphere. The characteristic feature of the isostatic anomalies
power spectrum is a pronounced minimum at the wavelength of about 1000 km. The relative homogeneity of the asthenosphere may
explain this minimum. It means that principal density inhomogeneities of the Earth's interior are separated by the asthenospheric
layer. Such a minimum has not been observed at the power spectrum of free air anomalies being masked by corresponding wavelength
of the field of isostatically compensated lithosphere. Isostatic anomalies that reflect the differences between the real structure
of the lithosphere and its isostatically compensated model have wavelengths less than 1000 km. Isostatic anomalies with the
wavelength more than 1000 km reflect the attraction of density inhomogeneities situated under the level of isostatic compensation.
The basic features of power spectrum of isostatic anomalies are the same for oceanic and continental areas. The method based
on Kolmogorov-Wiener filtration which consideres statistical characteristics of the field has been developed to divide the
isostatic gravity anomalies into lithosphere and mantle components. For the North Atlantic and adjacent areas the field of
mantle inhomogeneities has been determined. 相似文献
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使用BEDMAP2关于南极大陆及周围海域和JGP95E关于全球表面高程、冰厚和冰下及水深地形数据,采用球坐标系下的扇形球壳块重力效应公式,在极方位投影直角坐标网格节点上计算了南极大陆及周围海域的近区及远区的地形和艾黎均衡重力效应。南极大陆冰盖带来可观的正重力效应,南大洋负重力效应又影响到了南极内陆,全球地形/均衡重力效应与局部地形高低有关联性,而低负值区主要分布在环南极的陆坡。获得的约1n mile间距的地形和艾黎均衡重力效应网格数据可用于南极大陆及周边海域的重力改正,提供准确、一致的布格重力异常和艾黎均衡重力异常。 相似文献
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海底地形对开展海洋科学调查和研究十分重要。以多波束为主的回声测深技术测量成本高且效率低,几十年来仅实现了全球约20%的海床测绘。对于空白区（特别是深海区域）,可以借助重力异常和重力垂直梯度异常进行回归分析反演得到,但该方法得到的比例因子鲁棒性不强。为了解决这一问题,同时考虑到两种重力数据在表征海底地形长短波长的不同优势,本文结合滑动窗口赋权和稳健回归分析来反演海底地形。在太平洋皇帝山海域（35°～45°N,165°～175°E）的实验结果表明:在船测检核点处,本文构建模型的标准差为61.02 m,相比于单一重力数据反演模型,精度分别提高了14.92%（重力异常）和2.08%（重力垂直梯度异常）,能较好地反映皇帝海山链的地形走势。 相似文献
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Chan Hong Park Jeong Woo Kim Nobuhiro Isezaki Daniel R. Roman Ralph R. B. von Frese 《Marine Geophysical Researches》2006,27(4):253-266
To facilitate geological analyses of the Ulleung Basin in the East Sea (Japan Sea) between Korea and Japan, shipborne and satellite altimetry-derived gravity data are combined to derive a regionally coherent anomaly field. The 2-min gridded satellite altimetry-based gravity predicted by Sandwell and Smith [Sandwell DT, Smith WHF (1997) J Geophys Res 102(B5):10,039–10,054] are used for making cross-over adjustments that reduce the errors between track segments and at the cross-over points of shipborne gravity profiles. Relative to the regionally more homogeneous satellite gravity anomalies, the longer wavelength components of the shipborne anomalies are significantly improved with minimal distortion of their shorter wavelength components. The resulting free-air gravity anomaly map yields a more coherent integration of short and long wavelength anomalies compared to that obtained from either the shipborne or satellite data sets separately. The derived free-air anomalies range over about 140 mGals or more in amplitude and regionally correspond with bathymetric undulations in the Ulleung Basin. The gravity lows and highs along the basin’s margin indicate the transition from continental to oceanic crust. However, in the northeastern and central Ulleung Basin, the negative regional correlation between the central gravity high and bathymetric low suggests the presence of shallow denser mantle beneath thinned oceanic crust. A series of gravity highs mark seamounts or volcanic terranes from the Korean Plateau to Oki Island. Gravity modeling suggests underplating by mafic igneous rocks of the northwestern margin of the Ulleung Basin and the transition between continental and oceanic crust. The crust of the central Ulleung Basin is about a 14–15 km thick with a 4–5 km thick sediment cover. It may also include a relatively weakly developed buried fossil spreading ridge with approximately 2 km of relief. 相似文献
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Silja Märdla Jonas Ågren Gabriel Strykowski Tõnis Oja Artu Ellmann René Forsberg 《Marine Geodesy》2017,40(6):416-453
The deduction of a regularly spaced gravity anomaly grid from scattered survey data is studied, addressing mainly two aspects: reduction of gravity to anomalies and subsequent interpolation by various methods. The problem is illustrated in a heterogeneous study area and contrasting test areas including mountains, low terrains, and a marine area. Provided with realistic error estimates, Least Squares Collocation interpolation of Residual Terrain Model anomalies yields the highest quality gravity grid. In most cases, the Bouguer reduction and other interpolation methods tested are equally viable. However, spline-based interpolation should be avoided in marine areas with trackwise survey data. 相似文献