共查询到20条相似文献,搜索用时 78 毫秒
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误差源分析是一个系统产品精度保障的前提条件.介绍了InSAR高程测量的基本原理;根据基本原理,从影响高程测量精度的基线长度、基线倾角、相位差、雷达天线到地面目标点的距离以及雷达天线高度等5个要素着手;依据这5个要素的产生过程,结合基于编队卫星InSAR系统的特点对系统的误差源进行了研究;最后较系统地分析出了影响编队卫星InSAR系统的误差源. 相似文献
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分析和实现了基于单基线的GPS实时姿态测量系统。通过对姿态参数的精度分析,得出了姿态测量精度同基线长度和相对精度因子的关系;分析了姿态测量系统中单点定位对相对定位精度的影响;最后对姿态测量系统的实时性和姿态测量的结果进行了分析。本文的研究对GPS姿态测量技术的工程应用和理论研究具有一定的参考价值。 相似文献
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星载合成孔径雷达干涉测量几何精度的数字仿真 总被引:1,自引:0,他引:1
本文根据合成孔径雷达干涉测量原理,即根据雷达站坐标、距离、基线姿态和长度误差、绝对相位差与地面点坐标之间的严密数学模型,从一个虚构的DEM数据出发,研究了轨道参数和雷达图像的内、外定向参数对地面点精度的影响;求得了配对的雷达影像坐标、绝对相位差和相对相位差,形成了一套理想的雷达影像的几何数据。在这种理想的雷达影像几何数据的基础上,试验了INSAR中雷达站位置误差、基线姿态和长度误差、距离误差、绝对相位差的误差对地面点几何精度的影响。结果表明,各项误差因素中,影响最大的因素是基线姿态误差。 相似文献
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总结了我国工业摄影测量用基准尺长度标定的3种方法,对基准尺长度的标定方案和标定过程进行了研究。以国产某型号基准尺为例,对3种方法的特点进行了详细论述。通过实验研究,发现摄影测量法的实验重复性比较好,其次是灰度中心法,最差的是几何中心法;基准尺上标志点的外形质量对标定结果有较大影响。通过对3种方法的研究,以期为我国工业摄影测量中基准尺长度标定规范的制定提供借鉴和参考。 相似文献
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工业测量的一项重要内容就是确定仪器站之间的长度,也称之为基线测量,以确定测站的相对坐标。文中主要从理论上就基线测定的方法、精度和最佳交会构形进行了探讨。最后提出了实际基线测量应注意的若干问题。 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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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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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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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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Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders. 相似文献