顾及系统误差的地球静止轨道卫星PDOP值加权几何法定轨   总被引：1，自引：0，他引：1       下载免费PDF全文

贺凯飞  徐天河 《海洋测绘》2009,29(5):1-4

对顾及系统误差的地球静止轨道（GEO）卫星几何法定轨做了初步探讨,给出顾及系统误差的GEO卫星几何法定轨数学模型,推导了参数解算公式,提出PDOP值加权的几何法定轨方法,并讨论了权函数的选取。最后以卫星钟差为例进行模拟计算。结果表明：顾及系统误差的GEO卫星几何法定轨,可大大减弱系统误差对定轨结果的影响;基于PDOP值加权的几何法定轨,可进一步提高系统参数解算精度和定轨精度。  相似文献   

层析模型在GNSS探测电离层中的研究进展   总被引：1，自引：0，他引：1  

蒋廷臣  王秀萍 《测绘科学》2009,34(6)

在利用全球导航卫星系统GNSS(GPS、GLONASS、Galileo等卫星定位系统)进行精密定位和导航时,电离层延迟误差是影响其精度和准确度的主要误差源之一,故对电离层模型研究至关重要。本文介绍了传统电离层模型的缺点,重点阐述了不同的电离层层析方法,同时分析了现在电离层层析方法所存在的主要问题,最后介绍了目前全世界电离层层析模型的研究展望。  相似文献   

The Southern Annular Mode and opposite-phased Basin Mode of the Southern Ocean circulation     

Yuji Iijima  Shigeru Aoki  Kunio Kutsuwada 《Journal of Oceanography》2009,65(1):53-60

Over the Southern Ocean the dominant modes of the atmospheric field are known as the Southern Annular Mode (SAM) or Antarctic Oscillation, and the Pacific South American (PSA) pattern. Statistical analysis of sea surface wind (SSW) from satellite observation revealed two leading modes of SAM-like and PSA patterns. In the high latitudes, the SAM-like pattern of the SSW had a large amplitude over the Bellingshausen Basin and Australian-Antarctic Basin, with opposite phase between the two basins. On the intraseasonal time scale, large-scale sea surface height (SSH) also had notable variability, showing a basin-scale anti-phase mode over the two basins. To explain the response of oceanic variations to these atmospheric modes, we analyzed the relationship between the dominant modes of wind stress and large-scale SSH on the intraseasonal time scale. The SAM-like pattern of wind stress was correlated with the SSH variation over the two basins. The SSH basin mode was most simply explained by a simple barotropic response to the SAM-like mode of wind stress, with the curl of opposite phase between the two basins. We conclude that the zonal asymmetry of the wind field of the SAM plays an important role in driving the antiphase SSH basin modes.  相似文献   

下行L波段轨道法时间比对中Sagnac效应的计算     

刘晓刚  梁率  韩智超 《地理空间信息》2009,7(3):94-96

根据下行L波段轨道法进行时间比对的基本原理，详细介绍了Sagnac效应产生的原因。并以圆轨道地球静止同步卫星为例，推导了下行L波段轨道法时间比对中Sagnac效应在地心惯性系中的基本计算模型，给出了当地面站在赤道上和不在赤道上这两种情况下Sagnac效应的详细计算过程。  相似文献   

南海海盆重力异常场特征及构造演化   总被引：5，自引：0，他引：5  

姚运生  姜卫平  晁定波 《大地构造与成矿学》2001,25(1):46-54

卫星重力测高能提供高分辩率的空间重力异常资料。本文解译了南海地块细结构的重力异常特征 ,并探讨了南海海盆的形成与演化  相似文献   

SANARIS Project: A Satellite Network for Natural Risk Monitoring     

Tárraga  Marta  Garcia  Alicia  Ortiz  Ramon  Abella  Rafael  Peña  Javier 《Natural Hazards》2001,23(2-3):417-429

A new satellite communication system specificallydesigned for low-rate data applications has beendeveloped and prototyped. A validation project isproposed to install a pilot network to be operated for6 months. One of the target markets related tovolcanoes, has been selected, so that a group of usersis integrated in the project. A specific applicationfor this market will be developed regarding dataacquisition, processing, storage and dissemination todistant users. The feasibility of using the newsatellite system to provide a new Eutelsat service forlow-rate data applications, will be evaluated from theperformance of the pilot network. The system ofautomatic acquisition, field storage and communicationwith the local control center is already functioning,as well as the circulation of information viaInternet. The development of the application andtransmission via satellite to distant users is stillin an evaluation phase for the volcanoes of Timanfaya(Lanzarote, Canary Island), Vesuvius (Naples) and SeteCidades Caldera (Sao Miguel, Azores Islands).  相似文献   

卫星云图资料估计湿度的适时回归方法及其影响诊断   总被引：1，自引：3，他引：1  

吴诚鸥  沈桐立  王顺凤 《南京气象学院学报》2001,24(2):162-164

提出适时回归方法，由卫星云图资料估计湿度场，数理统计中的回归诊断是查找野点的有力方法，本文成功地运用回归诊断于卫星云图资料估计湿度场，提高了精确度，得到良好效果。  相似文献   

用GMS—5气象卫星资料遥感监测白天雾的研究   总被引：16，自引：2，他引：16  

李亚春  孙涵  李湘阁  唐勇  徐萌 《南京气象学院学报》2001,24(3):343-349

用日本GMS－5静止气象卫星的可见光通道和长波红外通道的资料，采用多通道合成和图像增强技术生成云雾彩色图像，分析了云雾的纹理特征、运动规律和消散规律，探讨了白天雾和低层云的遥感监测和识别方法，对沪宁高速公路沿线大雾进行了实时监测。  相似文献   

气象卫星探测资料在数值天气预报中的应用   总被引：2，自引：0，他引：2  

郑祚芳  沈桐立  张秀丽 《气象》2001,27(9):3-8

卫星遥感技术和其他非常规观测技术的发展和成熟，提供了大量的非实时、非完全、准连续的观测资料。与其他非常规观测资料相比，卫星观测资料具有水平分辨率高，观测面广阔，测量误差易于掌握等优点。分析和总结了目前卫星观测资料在数值天气预报模式中的应用情况，并对其未来发展做了一些有益的探讨。  相似文献   

Glonass Laser Ranging Accuracy With Satellite Signature Effect   总被引：1，自引：0，他引：1  

Toshimichi Otsubo  Graham M. Appleby  Philip Gibbs 《Surveys in Geophysics》2001,22(5-6):509-516

GLONASS satellites have been tracked by the worldwide laser ranging networkas well as by the GLONASS-borne microwave-based technique. Owing to thelarge size of their corner cube reflector arrays, the amount of ranging data is enough to determine their orbits from laser ranging data alone. We found, however, that the large size of the array affected the accuracy of measurement to an extent that is dependent on the characteristics of the ranging systems. An azimuthal variation of the reflector array response was also detected in observations from single-photon laser ranging. Orbital analysis reveals that the effect makes the measured range on average 22 mm shorter than expected in the absence of the large array, which explains more than half of the offset of 39 mm previously discovered between microwave and laser orbits.  相似文献