共查询到20条相似文献，搜索用时 390 毫秒
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首先分析了 GPS观测的主要误差源。其次 ,叙述了空基 (星载 ) GPS的科学应用 ,其中 TOPEX和 Micro L abe任务都是成功的范例。关于 GPS对于气象学的应用 (GPS/MET)方面 ,比较详细地介绍了地基 GPS/MET和空基(星载 ) GPS/MET的最新进展 ,二者处于 GPS的最新进展的前沿。 相似文献
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GPS技术在各行业已得到了广泛应用,GPS定位技术的发展已日益成熟,GPS定位技术为城市控制网的测量提供了简便可靠的方法。文章阐述了GPS用于城市控制网的测量方法,结合在开封市D级GPS控制网测量实践,研究了D级GPS控制网布设的方案设计、测量实施及数据处理,通过在开封市的实践证明,采用GPS测量方法建立城市控制网可以满足精度要求。 相似文献
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讨论了GPS/BD组合定位需要考虑的主要问题,自编了GPS/BD组合定位程序,利用实测GPS/BD观测数据分析了当前北斗导航定位系统可用性及GPS/BD组合前后的定位精度。试验结果表明,北斗已经能够提供区域的实时导航定位服务。GPS/BD组合定位在GPS观测卫星数较多时对GPS定位精度改善不明显,在GPS观测卫星数较少时可以显著提高定位精度和稳定性。 相似文献
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董玉刚 《测绘与空间地理信息》2016,(9):98-101
介绍了GPS/GLONASS定位系统发展状况,在分析GPS单点定位数学模型的基础上,研究了GPS/GLONASS组合系统伪距单点定位的数学模型,编程实现了GPS/GLONASS组合系统伪距单点定位程序。分别比较GPS单系统、GLONASS单系统与GPS/GLONASS组合系统单天6 h伪距单点定位精度,结果表明,组合系统单点定位精度优于GPS单系统与GLONASS单系统结果。 相似文献
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GPS现代化和GPS信号重构技术的进展 总被引：2，自引：0，他引：2
介绍了GPS现代化计划和GPS信号重构技术的进展。GPS信号重构的目的是确保在某些特定区域的美军能够正常使用GPS而不受影响,而在同一区域与美军对立的一方既不能使用民用GPS信号,也不能使用GPS的军码,至于在该特定区域以外的民间GPS用户,则依然能够正常使用GPS;此外还重点介绍了由美国大地测量局(NGS)主持运行的GPS陆基增强系统(CORS)。 相似文献
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随着GPS技术的不断发展,GPS技术被广泛应用于测绘学科,然而GPS所采用的高程系统与我国规定的高程系统不同,GPS大地高在测量工作中的应用受到很大限制。如何把GPS大地高转换成正常高是测绘科研人员一直研究的问题,GPS高程拟合是一种比较简单、实用的转换方法。本文对于GPS拟合的原理、几种拟合方法进行了介绍,并对不同的GPS高程拟合方法在工程测量中的应用进行了实例分析。GPS高程拟合可以满足普通工程测量对高程精度的要求,通过GPS高程拟合可以把GPS大地高转换成正常高,大量减少了水准测量的工作量,提高了工作效率,较少了工作成本。 相似文献
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高灵敏度GPS技术的研究进展 总被引：10，自引：1，他引：10
介绍了高灵敏度GPS（High—Sensitivity GPS）技术的研究进展及高灵敏度GPS技术的应用前景和研究意义。分析了GPS信号在室内、森林、城市等一般GPS接收机无法应用环境的特性，综述了高灵敏度GPS关键技术的基本原理。高灵敏度GPS技术的核心就是室内环境微弱GPS信号的捕获技术，重点介绍了捕获室内环境弱GPS信号的基本方法，总结了各种捕获算法的特点。 相似文献
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黄建学 《测绘与空间地理信息》2014,(11)
随着时代的发展,GPS－RTK作为GPS测量技术发展的新突破广泛应用于地质勘查。本文通过对GPS－RTK技术的分析,简要介绍了GPS－RTK技术工作原理及工作流程,阐述了GPS－RTK的技术特点,并结合测量工程实例探讨了GPS－RTK技术在地质勘查中的应用,并指出GPS－RTK技术在地质勘查中的优势以及其在实际应用中应注意的问题,使其得到了更为广泛的推广和应用。 相似文献
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采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的
污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体
污染变化曲线,得出污染物浓度随着远离上游而增加。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
Abstract Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised. 相似文献
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自动车辆定位导航系统中传感器的误差分析 总被引：1，自引：0，他引：1
对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析，导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础，同时也为选择适当的传感器提供了理论根据。 相似文献