共查询到20条相似文献，搜索用时 93 毫秒
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对只接收到一组GPS卫星广播星历的情况下应用广播星历拟合计算卫星在轨位置的方法进行了研究，通过与精密星历进行比较，对拟合计算的精度进行了说明。 相似文献
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以力学模型为基础,只能分析GPS卫星在短时间内的变化规律,而利用IGS提供的精密星历可以分析卫星在长时间段内的变化规律。基于精密星历研究了计算GPS卫星轨道参数的方法,然后对轨道参数在长时间段内的变化情况进行了分析,给出了分析的主要结果,并提出用正弦函数对轨道参数进行逼近,以得到GPS轨道的解析模型。 相似文献
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在GPS单点定位和相对定位中都需要不断计算卫星的坐标。IGS提供的精密星历为15min间隔，要得到更小间隔的数据，就要进行插值。利用广义延拓插值进行GPS精密星历插值，探讨插值精度与三个参数的关系，并与Lagrange多项式插值和三角插值结果进行比较。结果表明，广义延拓插值法具有较高的精度，完全适用于精密星历的插值。 相似文献
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通过GPS广播星历求出一个时间段内间隔一定时间的离散卫星三维坐标，以这些卫星坐标序列为已知数据反求星历参数的方法，论述和验证了当卫星坐标发生旋转变化时，解算得到的相应地面点坐标的旋转矩阵与卫星坐标发生旋转变化的矩阵具有相同的值。这对于实现GPS加密具有很大的意义。 相似文献
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数据同化——它的缘起,含义和主要方法 总被引：31，自引：1，他引：30
我国已进入流体动力学的卫星观测世纪,数据同化（有时叫“四维同化”）,势必成为随之而来的重要课题之一。针对目前人们对这一课题尚无太多了解,从而在实际工作中产生一些混乱,笔者在本文就数据同化的必要性,它的含义,它的开创和现在研究、应用中的主要方法作一比较详细的论述。 相似文献
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Methods for processing satellite data on ice features that pose a threat to the safety of offshore operations in the Arctic seas are considered. They are divided into interactive, automated, and automatic methods. The methods are illustrated by examples of archival satellite data on the Russian Arctic sector. Radar and optical data have been used as the satellite information source. It is shown that the successful satellite monitoring of dangerous ice features requires the optimal combination of satellite observations at various stages that provide for a synergistic approach to the data assimilation of different spectral bands obtained using different spacecraft. 相似文献
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为了使全球性的海洋观测数据能够及时、可靠、准确地接收,介绍了基于卫星网络海洋观测数据传输链路的组成,对卫星传输链路的3个组成部分进行详细说明,包括:Iridium,Argos,Inmarsat和中国北斗四种卫星网络系统及比较分析,各卫星网络对应发送终端的分类分析以及陆地接收系统数据下载方式的比较分析。以Iridium网络系统为例,建设可实现全球覆盖的海洋观测数据卫星传输链路,完成现场观测数据的实时回传,为海洋观测数据卫星传输链路的建设提供示范,对比PSTN和M2M两种数据下载方式,通过实验分析,结果表明该海洋观测数据的卫星传输链路具备可行性和可靠性,可以进行业务化运行。 相似文献
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Two methods for the investigation of suspended particulate matter (SPM) transport in the North Sea are presented: numerical modeling and remote sensing by satellite. The principles and the main components of the two methods are outlined. The numerical model uses a particle tracer method for the simulation of advective transport. It takes into account the interaction with the sediment bed (deposition, erosion). Remote sensing uses data of the Coastal Zone Colour Scanner (CZCS). The physical background of remote sensing is outlined and an inverse modeling procedure for evaluation of the satellite images is described. Data obtained with the two methods are compared with each other and with ship measured data which shows the strong and the weak points of each method. The combined use of field measurements, satellite observations, numerical modeling and specific in situ process studies is recommended as the most effective way to investigate SPM transport 相似文献
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Victor S. Kuwahara Grace Chang Xiaobing Zheng Tommy D. Dickey Songnian Jiang 《Journal of Oceanography》2008,64(5):691-703
Buoy-mooring platforms are advantageous for time-series validation and vicarious calibration of ocean color satellites because
of their high temporal resolution and ability to perform under adverse weather conditions. Bio-optical data collected on the
Bermuda Testbed Mooring (BTM) were used for comparison with satellite ocean color data in an effort to further standardize
sampling and data processing methods for high quality satellite-mooring comparisons. Average percentage differences between
satellite-measured and mooring-derived water leaving radiances were about 20% at the blue wavelengths, decreasing to as low
as 11% in the blue-green to green wavebands. Based on a series of data processing methods and analyses, recommendations concerning
rigor of quality control for collected data, optimal averaging of high-frequency data, sensor self-shading wind corrections,
and instrumentation placement requirements are given for the design and application of optical moorings for ocean color satellite
validation. Although buoy-mooring platforms are considered to be among the very best methods to validate ocean color satellite
measurements, match-up discrepancies due to water column variability and atmospheric corrections remain important issues. 相似文献
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基于对多种飞机的机载GPS测量实践,认为我国HY-2海洋二号卫星实现厘米级精度的星载GPS定轨测量的基础是:选择适合天线,捕获多颗在视GPS卫星;注重天线安装位置,减弱多路径效应影响;选择适合GPS信号接收机,确保星载GPS测量数据优质。 相似文献