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121.
???????μ???巽??????????????????????????ZTD?????÷????????????????????????????????????????????幫?????????????????????????????????????????Ч????ZTD????徫???????SCIGN?????GPS?????????????????????????Χ?????????????????????????????????????ZTD??????????????????????????????????????????????????????????????????????????????????????????????????????????????????? 相似文献
122.
��ѹ��GPS�����ɽ�ˮ�������Ӱ����� 总被引:1,自引:0,他引:1
????????????λ?ο??????????????GPS?????????????????????????ZTD???????????????ZHD???????????????????????GPS/MET????????У?ZTD??GPS?????????????????????????????????????????????????Щ?????????????GPT????????????????????????????????????й????????????t??????????????????????????????GPS???λ?ò???μ????Σ??????????????λ?ù???????????????????????????GPS??????????????????? 相似文献
123.
????????CORS???ο????????????????????????????????????????????λ???й??????????????????????????CORS??????????????????????????????????????????????????????????????????????????????8.5 mm??????????????????????????????????????????????????????????????????????????PWV????????????????1.5 mm?? 相似文献
124.
?????????????????????????????MODIS????????????о????????μ????????????о???????MODIS?????????????????????????????????????????????????????????????????????????????????????????????????? 相似文献
125.
126.
该文概述了卫星遥感积雪监测原理,介绍了积雪判识方法,对国家卫星气象中心已有的业务化极轨气象卫星冬季旬积雪监测算法和流程进行了改进.经过比对,设计了新的可见光太阳天顶角订正模式,针对NOAA-16/AVHRR3和FY-1D/MVISR重新确定了积雪判识变量及相应的动态积雪检测阈值,提出了概率积雪判识方法,结合多光谱阈值法建立了概率结合阈值(Probability Combined with Threshold,PCT)的积雪判识方法,并以该算法为基础建立了新的业务化积雪动态遥感监测系统.同时,用新算法对部分历史产品重新做了处理,并简要分析了1996至2003年中国地区冬季积雪分布特征. 相似文献
127.
Results of the estimation of azimuth-dependent phase center variations (PCVs) of GPS satellite antennas using global GPS data
are presented. Significant variations of up to ±3–4 mm that are demonstrated show excellent repeatability over eight years.
The application of the azimuthal PCVs besides the nadir-dependent ones will lead to a further reduction in systematic antenna
effects. In addition, the paper focuses on the benefit of a possible transition from relative to absolute PCVs. Apart from
systematic changes in the global station coordinates, one can expect the GPS results to be less dependent on the elevation
cut-off angle. This, together with the significant reduction of tropospheric zenith delay biases between GPS and VLBI, stands
for an important step toward more consistency between different space geodetic techniques. 相似文献
128.
GPS气象的可靠性检核研究 总被引:1,自引:2,他引:1
本文通过对GPS湿延迟和水汽辐射计、GPS可降水量与无线电探空资料的比较,进行了GPS气象可靠性检核研究。得出如下结论:GPS可降水量序列与无线电探空的相关性可达0.94;差值均值为-0.24mm;均方根4.0mm。文中对用精密星历及快速预报星历计算所得的GPS湿延迟和水汽辐射计数据进行了比较,在发展趋势上水汽辐射计观测数据与快速预报/精密星历解算出的对流层湿延迟相近,且经过精密星历与快速预报星历反演所得出的的对流层延迟与水汽辐射计数据的差值的均方根分别为1.51cm、1.52cm。 相似文献
129.
Peter Steigenberger Volker Tesmer Manuela Krügel Daniela Thaller Ralf Schmid Sibylle Vey Markus Rothacher 《Journal of Geodesy》2007,81(6-8):503-514
Troposphere parameters estimated from space-geodetic techniques, like the Global Positioning System (GPS) or Very Long Baseline
Interferometry (VLBI), can be used to monitor the atmospheric water vapor content. Although the troposphere can only be monitored
at discrete locations, the distribution of the instruments, at least the GPS antennas, can be assumed to be quasi-global.
Critical in the data analysis are systematic effects within each single technique that significantly degrade the accuracy
and especially the long-term stability of the zenith delay determination. In this paper, consistent time-series of troposphere
zenith delays and gradients from homogeneously reprocessed GPS and VLBI solutions are compared for a time period of 11 years.
The homogeneity of these completely reprocessed time-series is essential to avoid misinterpretations due to individual model
changes. Co-located sites are used to investigate systematic effects and the long-term behavior of the two space-geodetic
techniques. Both techniques show common signals in the troposphere parameters at a very high level of precision. The biases
between the troposphere zenith delays are at the level of a few millimeters. On the other hand, long-term trends significantly
differ for the two techniques, preventing climatological interpretations at present. Tests assume these differences to be
due to mathematical artifacts such as different sampling rates and unmodeled semi-annual signals with varying amplitudes. 相似文献
130.
对准实时地基GPS可降水量的解算方案与可靠性的探讨,围绕三个方面展开:准实时GPS对流层延迟解算的最佳方案的确定;GPS可降水量与无线电探空资料的比较;GPS可降水量与水汽辐射计数据的比较。为了实时应用于气象领域,准实时对流层延迟的最佳方案为快速预报星历松弛解。在快速预报星历松弛解GPS可降水量与无线电探空数据的比较中,两者的相关性为0.88,绝对值均值为5.4 mm。GPS可降水量与水汽辐射计资料比较得到两者差值的均方根为1.68 mm。最后得到了最佳的准实时地基GPS可降水量的解算方案和在气象领域可降水量的反演的可行性的结论。 相似文献