激光测高数据辅助卫星成像几何模型精化处理   总被引：1，自引：1，他引：0  

曹宁  周平  王霞  唐新明  李国元 《遥感学报》2018,22(4):599-610

资源三号02星(ZY-3 02)作为资源三号系列的第2颗卫星,于2016年5月30号成功发射,其主要服务于中国空间基础建设等重大工程,星上搭载了中国首个对地观测试验性激光测高载荷。高程精度作为立体测图的重要指标,达到其精度要求的困难程度远大于平面。在借鉴目前较成熟的卫星影像区域网平差理论的基础上,结合近年来激光测高数据精度的大幅提升以及ZY-3 02星激光测高数据的特点,首次提出了激光测高数据辅助卫星立体影像进行成像几何模型精化处理的通用理论。首先,利用传统的区域网平差算法对所处理影像进行高精度连接点匹配处理,并对其进行无约束的自由网平差处理,获得高精度相对精度及不亚于原始成像几何模型的绝对精度;其次,根据激光测高数据3维坐标和精化后参考影像成像几何模型获取激光数据参考影像坐标;然后,将参考影像坐标通过几何模型映射获取目标影像上待匹配影像坐标,通过连接点匹配算法,对待匹配目标影像坐标进行精化获取高精度像方同名点;最后,以同名点作为高程控制进行区域网平差计算,对影像成像几何模型进一步处理,获取高精度补偿参数。通过湖北、青海两测区的试验,以激光测高数据辅助卫星影像几何模型精化精度可分别达到1.97 m、3.23 m,结果表明本文提出的方法可有效提高卫星立体数据测图精度。  相似文献   

高度计测距精度对沿轨迹重力异常反演的影响     

李洋  张润宁 《测绘学报》2015,44(4):363-369

应用求解沿轨迹重力异常的垂线偏差法以及求解空间分辨率的交叉谱分析法,建立了高度计测距精度与沿轨迹重力异常反演精度以及空间分辨率的关联性模型。首先依据卫星测高原理,给出了沿轨迹重力异常的误差传播公式,然后以此为基础通过推导交叉谱分析中一致性系数与信噪比的数学表达式,建立了高度计测距精度与空间分辨率的解析关系。数值仿真结果表明:雷达高度计测距精度与沿轨迹重力异常反演精度成正比关系,与空间分辨率成幂函数关系,即高度计测距精度提高m倍,沿轨迹重力异常反演精度提高m倍,全球海域平均空间分辨率提高m0.464 4倍。将数值仿真结果与相关文献中对实际测高数据的处理结果进行比较,验证了理论分析及模型的正确性。  相似文献   

验后平差方法在Geosat/GM卫星测高数据处理中的应用   总被引：1，自引：0，他引：1       下载免费PDF全文

刘传勇  暴景阳  黄谟涛  欧阳永忠  陆秀平  李春菊  张献 《海洋测绘》2008,28(1):5-8

为了消除多代卫星测高数据之间的不协调性,利用两步处理法对Geosat/GM正常点海面高数据进行自交叉点平差及与T/P卫星测高数据联合平差,发现误差模型的系数计算出现异常,通过分析误差模型及正常点海面高数据的分布特征,找出了出现异常的原因,对计算方法进行改进后,大大提高了计算结果的稳定性和可靠性。  相似文献   

������Χ��TOPEX/Poseidon���Dz�߲��η���     

高永刚  郭金运  黄金维  岳建平 《大地测量与地球动力学》2008,28(1):45-49

??TOPEX/Poseidon????????????Χ???????ν??з??????ó?????:?????????????Χ???????????ε?????;????????????????????ζ??????????,?????????????????????????????????????????????  相似文献   

用CSR4.0+CS模型计算海潮负荷改正   总被引：1，自引：1，他引：0  

王文利  董鸿闻 《大地测量与地球动力学》2003,23(4):70-74

介绍了CSR3．0与CSR4．0 CS海潮模型，并对两模型进行了分析和实算比较，认为CSR4．0 CS比CSR3．0海潮模型精度更高，在计算中国测站海潮改正时，顾及中国近海海潮图是必要的。对我国第二期水准路线用CSR4．0 CS模型计算了海潮负荷改正，结果表明：海潮负荷对高精度水准测量的影响，主要取决于水准路线的近海位置，越是近海地区越明显；在近海区域，这项改正不能忽略。  相似文献   

Evaluation of the accuracy of the EIGEN-1S and -2 CHAMP-derived gravity field models by satellite crossover altimetry     

J. Klokoník  J. Kostelecký  C.A. Wagner  P. Schwintzer  Ch. Förste  R. Scharroo 《Journal of Geodesy》2005,78(7-8):405-417

Since the advent of CHAMP, the first in a series of low-altitude satellites being almost continuously and precisely tracked by GPS, a new generation of long-wavelength gravitational geopotential models can be derived. The accuracy evaluation of these models depends to a large extent on the comparison with external data of comparable quality. Here, two CHAMP-derived models, EIGEN-1S and EIGEN-2, are tested with independent long-term-averaged single satellite crossover (SSC) sea heights from three altimetric satellites (ERS-1, ERS-2 and Geosat). The analyses show that long-term averages of crossover residuals still are powerful data to test CHAMP gravity field models. The new models are tested in the spatial domain with the aid of ERS-1/-2 and Geosat SSCs, and in the spectral domain with latitude-lumped coefficient (LLC) corrections derived from the SSCs. The LLC corrections allow a representation of the satellite-orbit-specific error spectra per order of the models spherical harmonic coefficients. These observed LLC corrections are compared to the LLC projections from the models variance–covariance matrix. The excessively large LLC errors at order 2 found in the case of EIGEN-2 with the ERS data are discussed. The degree-dependent scaling factors for the variance-covariance matrices of EIGEN-1S and –2, applied to obtain more realistic error estimates of the solved-for coefficients, are compatible with the results found here.  相似文献   

Second Tesseral Harmonic Torque Due to the DynamicS of the Oceanic Surface Layer as Detected by TOPEX/POSEIDON Altimetry 1993-2000     

M. Burša  S. Kenyon  J. Kouba  Z. Šíma  V. Vatrt  V. Vítek  M. Vojtíšková 《Studia Geophysica et Geodaetica》2005,49(1):13-22

Estimates of the second tesseral torque due to the variations in the radial space position of the mean ocean surface as monitored by TOPEX/POSEIDON altimeter system are derived. The magnitude of the studied torque may be compared to the tidal torque and to the tesseral torque caused by deformations due to the Earths rotation. However, such torque estimates strongly depend on the thickness of the ocean surface layer adopted in the spherical model of which the dynamics is believed to be responsible for the derived torque. The dependence on the thickness is discussed.  相似文献   

Mapping nonlinear shallow-water tides: a look at the past and future   总被引：1，自引：1，他引：0  

Ole B. Andersen  Gary D. Egbert  Svetlana Y. Erofeeva  Richard D. Ray 《Ocean Dynamics》2006,56(5-6):416-429

Overtides and compound tides are generated by nonlinear mechanisms operative primarily in shallow waters. Their presence complicates tidal analysis owing to the multitude of new constituents and their possible frequency overlap with astronomical tides. The science of nonlinear tides was greatly advanced by the pioneering researches of Christian Le Provost who employed analytical theory, physical modeling, and numerical modeling in many extensive studies, especially of the tides of the English Channel. Le Provost’s complementary work with satellite altimetry motivates our attempts to merge these two interests. After a brief review, we describe initial steps toward the assimilation of altimetry into models of nonlinear tides via generalized inverse methods. A series of barotropic inverse solutions is computed for the M tide over the northwest European Shelf. Future applications of altimetry to regions with fewer in situ measurements will require improved understanding of error covariance models because these control the tradeoffs between fitting hydrodynamics and data, a delicate issue in coastal regions. While M can now be robustly determined along the Topex/Poseidon satellite ground tracks, many other compound tides face serious aliasing problems. In memory of Christian Le Provost  相似文献   

A new insight on the decreasing sea level trend over the Ionian basin in the last decades     

Jorge Del Río Vera  Francisco Criado-Aldeanueva  Jesús García-Lafuente  F. Javier Soto-Navarro 《Global and Planetary Change》2009,68(3):232-235

Altimetry measurements over the Ionian region and tide gauge records along the southern Italian coasts have been combined to analyse the negative sea level trend over the Ionian basin in the last decades. The apparent decreasing trend should be better understood as an abrupt sea level drop in 1998 probably linked to changes in the surface circulation in the Ionian basin induced by the Eastern Mediterranean Transient, which changed from anticyclonic to cyclonic about March 1998. From then onwards, a rising rate of 7.9 ± 0.9 mm/year is observed over the basin.  相似文献   

基于TOPEX/Poseidon卫星数据的江河流量测算     

张继群  徐开钦  龟山哲  渡边正孝  陈秀万  孙春鹏 《地理学报》2004,59(1):95-100

TOPEX／Poseidon卫星的原始目的是测量海面高度变化信息,为海洋监测服务。作者通过假设基准面的方法,将由TOPEX／Poseidon卫星数据估算的下垫面水位相对变化信息转化为”水位”系列并建立了由TOPEX／Poseidon得出的“水位”与相邻水文站实测流量间的相关关系,进而实现了由TOPEX／Poseidon卫星数据估算河道流量的目的。利用1998～1999年TOPEX／Poseidon在长江下游大通附近的过境数据和对应年份大通水文站实测流量数据,验证了本方法的可行性。研究结果表明：在长江下游河道地区,由TOPEX／Poseidon卫星数据可定量估算出山河流流量信息。  相似文献