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应用可视化技术构造卫星运行的虚拟场景,实时显示卫星运行状态及星下点轨迹,可为卫星轨道设计、卫星运行状态监控及卫星应用提供直观的分析和指导。通过对卫星轨道计算方法、几何建模、虚拟场景装配及虚拟场景驱动方法研究,本文开发了卫星运行三维场景及星下点轨迹可视化软件。本文详细给出了地球模型、卫星模型的建模及由此模型组装卫星运行场景的方法,卫星轨道计算及星下点轨迹可视化方法。该软件可实时模拟卫星在太空中的运行场景,给出卫星的即时经纬度坐标及星下点位置坐标。该软件已在实践中得到应用。 相似文献
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GRACE重力卫星数据的水文应用综述 总被引:3,自引:0,他引:3
重力反演与气候实验卫星GRACE(Gravity Recovery and Climate Experiment)为研究深层地球结构和跟踪地球表面质量变化提供了新手段,在一定程度上完善了当前全球水文监测系统。检测全球或区域水文信息对于研究全球或区域水资源变化和水量平衡具有重要意义。首先对GRACE重力卫星进行概括介绍,然后对GRACE卫星数据在极地高山冰川、海洋和陆地水储量等方面的应用现状进行分析总结,归纳GRACE水文研究中的验证方法,最后总结GRACE水文应用中面临的主要技术难点及可能的解决方案。 相似文献
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基于电推系统的地球同步轨道(GEO)卫星需要利用霍尔推进器使其从地球同步转移轨道(GTO)推到GEO轨道,整个变轨时间段长达数月。在整个变轨过程中卫星具有姿态无法保持对地的特点,该特点将会减少卫星可测控时长。针对变轨段卫星姿态不确定减少可测控时长的问题,提出了一种在已有的轨道和姿态条件下,使用梯度下降算法寻找测控天线最优布局的方法,目的是使卫星获得最长的总可测控覆盖时长以及对中继星最长的可测控时长。结果显示通过改动天线布局可以显著地提升对地以及对中继星可测控覆盖时长,同时也能提升转移轨道关键时段对中继星可测控覆盖时长。与为天线增加转台与控制系统这类传统方法相比,该方法可以在不增加成本和质量的前提下,在一定程度上改善了电推卫星的可见性时长,对全电推卫星测控有指导意义。 相似文献
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粒子滤波在卫星轨道确定中的应用 总被引:3,自引:0,他引:3
卫星轨道确定问题中可能存在初始估计信息误差较大、状态及测量误差分布不是高斯分布等问题,为了寻求一个能采用解决这两种问题的方法,本文采用了“采样-重要性-重采样”SIR(Sampling Importance Resampling)粒子滤波算法作为滤波方法,以地磁场矢量为测量量,对低地球轨道卫星的轨道数据进行自主的估计.为了避免该滤波算法中的采样贫乏的问题,采用了一个崎岖化方法来克服采样贫乏问题.最后给出了此方法应用到了卫星轨道确定问题中的数字仿真实例. 相似文献
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高分四号是我国发射的第一颗地球同步轨道卫星,具有较高的空间分辨率及快速重复成像能力,在城市大气环境的高动态监测方面拥有较大的应用潜力。针对城市地区地表反射率高、地表类型复杂,传统的单一算法较难实现大气气溶胶光学厚度有效反演等问题,以北京市为研究区,使用了一种暗目标法和地表反射率数据库相结合的方法,分别对2017年5月25日和10月5日两个时相的气溶胶光学厚度进行了估算。结果表明,该方法能够有效实现城市暗目标区和亮目标区的气溶胶反演,且与MODIS标准陆地气溶胶产品及AERONET站点地面观测数值较为一致,相关系数超过了0.9。 相似文献
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海洋监测技术已列为我国中长期科技发展纲要中优先发展的前沿技术。随着定位、导航、控制等相关技术的快速发展,搭载多种传感器的无人船,可在近、中、远等不同海域长时间自主工作,连续进行数据采集。随着卫星通信技术的发展,长期困扰海洋监测设备的通信问题,出现了越来越多的解决方案。结合智能控制的无人船传感器平台,基于新一代卫星通信技术构建全球测控网络,基于大数据技术实现海洋监测数据存储、处理、分析等工作的自动化,基于互联网技术的最新成果,建立海洋监测数据的服务框架,提出了一套全新的海洋监测及数据应用的解决方案。 相似文献
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海洋对全球气候、气象、环境和经济发挥着重要作用,因此,有必要对其进行监测、研究及预测发生在海洋内部和海洋表面的运动过程。海面风场信息、海面波浪谱信息能够体现并反演海洋气象、海洋动力学特性、海洋资源、海洋污染情况、海洋经济性和海岸环境。波谱仪(SWIM,Surface Wind Investigation and Monitoring)和微波散射计(SCAT,Scatterometer )可以用于获取海面波浪谱信息和海面风场信息。首先对这两套载荷系统进行了介绍,并简要对基于这类主动微波遥感载荷配置的卫星设计进行了任务分析,最后给出了基于波谱仪、微波散射计联合使用在小卫星平台应用背景下卫星系统级设计的几个主要方面进行了研究和分析。 相似文献
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静止卫星凭借其宽覆盖、高时效、机动灵活的特点,在国家减灾救灾业务中有着独特的应用优势。在回顾国内外静止卫星发展的基础上,总结其光学成像传感器在灾害监测预警中的应用现状和存在的问题。基于静止卫星及其载荷现有研制基础,从灾害管理各阶段应用需求出发,分析光学成像静止卫星在减灾中的应用潜力。根据减灾救灾实际业务和应用需求,分别从卫星工作模式、观测频次以及光学图像的几何性能、光谱范围、辐射性能等5个方面提出对静止卫星的技术指标要求,为推动我国的防灾减灾光学成像静止卫星建设提供借鉴。 相似文献
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A. Turiel J. Isern‐Fontanet E. Garcia‐Ladona J. A. Young 《International journal of remote sensing》2013,34(17):3953-3962
We demonstrate the potential of monitoring coherent wave fronts on the tropical ocean surface using an advanced detection algorithm applied to visible sunglint‐affected imagery from geostationary satellites. Data from MeteoSat are processed with the advanced analysis technique to reveal transient wave activity near and to the west of the Mascarene Ridge of the western Indian Ocean. The technique is based on a wavelet‐based singularity analysis which enhances the subtle but highly coherent wave patterns in the meteorological satellite data. It is likely that the patterns represent internal ocean waves, a pathway to ocean mixing and climate. The prospect for using this detection algorithm in greatly expanded satellite global surveys of wave activity is outlined. 相似文献
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Using remote sensing data for marine monitoring, marine rescue, marine pollution monitoring which has a broad monitoring area and fast response time, so in the last 10 years, satellite borne or airborne optical and SAR sensor data have been increasingly used in the field of ocean monitoring. However, based on the dynamic video to carry out the study of the detection of irregular debris blocks from the wrecked ship, aircraft is less. To a great extent, it affects the efficiency of maritime rescue. This paper, based on the dynamic objects detection, Color Space Quantization and property of Human Vision System, takes the irregular wreckage patches as research. And a detection algorithm for dynamic objects is developed with the foundation of Lab channels. To verify that, the calculation of the Euclidean distance between the characteristic parameters of irregular wreckage patches and regular floating ones, and the average Euclidean distance is 0.8245 between the irregular1 and the regular while that between irregular2 and the regular is 4.3645. At the same time, the Hausdorff distance was calculated and verified, and the average distance between the irregular block 1 and the regular block was 2.5975. The average distance between the block 2 and the rule block was 13.8962. Experimental results show that the method is consistent with the results of the second methods, which proves that the first method is scientific and operational. Therefore, it can be found that some parameters including divergence, elongation and eccentricity fluctuate dramatically from those in irregular ones to the regular one, which could be extracted to recognize or distinguish the patches. That is why this paper is of importance in marine rescue and detection of objects on the sea surface. 相似文献
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HY-1卫星资料在海洋上的典型应用 总被引:2,自引:0,他引:2
HY-1卫星是我国发射的第一颗探测海洋水色的卫星,星上载有10波段COCTS水色扫描仪和4波段CCD成像仪。针对两种传感器数据的特点,分别介绍它们在海洋上的典型应用,对应用算法和生成的应用产品进行了简要说明,并展示了部分应用结果。典型应用的范围涉及到海洋污染、灾害监测,海冰、海温预报,海岸带动态变化研究、海洋渔业环境信息以及海洋初级生产力研究等方面,其中一些产品在日常业务应用中收到较好的效果,说明HY-1卫星作为一颗实验型业务卫星起到了应有的作用。HY-1卫星资料的典型应用为我国后续海洋卫星的研发提供了宝贵的科学依据和实践经验。 相似文献
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随着经济社会的高速发展,海洋工程产生的大量疏浚物被倾倒至海洋,随意的倾倒容易造成海洋生态系统失衡。海洋倾废监管系统作为海洋监管的技术手段,在海洋倾倒监管方面起到了巨大作用,如果倾倒船舶发送至海洋倾废监管系统的数据不进行处理,会使得海洋倾废监管系统显示界面的轨迹点过多,导致倾倒船舶轨迹不清晰的问题。研究曲线抽稀算法中的步长法,验证和探讨数据抽稀算法对船舶轨迹点的减少量。根据数据的参数类型,选取时间间隔、水位变化和距离变化作为数据抽稀算法的参数,研究不同参数值下的船舶轨迹点的减少量。经实验测试,数据抽稀后的数据量比原始数据量减少了95%以上,其数据点连成的轨迹线与原始数据点连成的轨迹线基本一致。在保证倾倒船舶轨迹的前提下,数据抽稀算法能有效减少原始数据量,使得海洋倾废监管系统显示界面简洁,满足了海洋倾废监管要求。 相似文献
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Muhammed Enes Bayrakdar 《计算机系统科学与工程》2020,35(4):283-292
The underwater sensor network is a rapidly developing area of research with a wide range of applications such as data collection in the ocean, pollution
monitoring, and ocean sampling. One of the most researched areas is the coverage of underwater sensor networks, which are the basis of many applications.
The coverage is usually related to how effectively a network is monitored by the sensor. There are major problems in the ocean or marine region, especially
in water pollution. Underwater pollution generally causes acidification, plastic residues, and toxins. Today, the determination of this pollution is carried out
through a human surveillance monitoring process. Therefore, there is a need for an automatic and intelligent monitoring system to identify the formation
of pollution. The proposed simulation model defines the intelligent sensor-based monitoring system that identifies and alarms the formation of underwater
pollution. Aloha was chosen as the medium access protocol for the cost-effective system in which we designed the simulation model. The efficiency of the
system has been shown to be more stable, cost-effective and manageable than the monitoring process involving the existing human surveillance by testing
with the simulation model. 相似文献
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随着我国经济的快速发展和城市化进程的加快,大气细颗粒物PM2.5已经成为影响我国大气环境污染的主要因素之一。利用静止卫星数据可以获取大范围的面状PM2.5信息,为我国大气环境的监测、治理、预测等提供了不可替代的数据源。以江苏省为研究区,利用静止卫星GOCI数据,在反演逐时气溶胶光学厚度(AOD)的基础上,结合气象因子,利用多元统计分析进行了研究区PM2.5的遥感反演研究。结果表明:基于AOD的多元统计模型,在估计的PM2.5浓度和观测值之间表现出良好的一致性,拟合度R 2为0.665 2。在对AOD进行湿度订正后得到的dry AOD进行多元统计建模,预测的PM2.5浓度与观测值之间的拟合度R 2达到了0.702 6,证明了经过湿度订正后的“干”AOD与PM2.5之间建立的关系更加可靠。使用GOCI反演的AOD计算PM2.5浓度,在空间分辨率和时间分辨率上充分体现了GOCI作为静止卫星监测PM2.5的优势。在空间分分辨率上,基于GOCI卫星获取AOD的空间分辨率为500 m,优于MODIS 10 km的AOD产品;时间分辨率上,基于GOCI获取AOD实现每日自9:00~16:00逐小时监测,优于MODIS每日两次的AOD产品。 相似文献
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With the rapid development of China's economy and the acceleration of urbanization, PM2.5 has become one of the major factors affecting atmospheric environmental pollution in China. The use of geostationary satellite data can obtain a wide range of regional PM2.5information, providing irreplaceable data sources for China's atmospheric environment monitoring, control, and forecasting. This paper uses the geostationary satellite GOCI data, based on Aerosol Optical Depth (AOD) retrieveal, combined with meteorological factors, and uses multivariate statistical analysis to study the remote sensing retrieval of PM2.5 in the study area. The results show that the multivariate statistical model based on AOD shows a good agreement between the estimated PM2.5 concentration and the observed values, and the fitting degreeR 2 is 0.665 2. After multivariate statistical modeling of dry AOD obtained after moisture correction of AOD, the fitting degree R2 between the predicted concentration of PM2.5 and the observed value reached 0.702 6, which proved the relationship established betweenthe “dry” AOD after the humidity correction and PM2.5 is more reliable.The use of GOCI-retrieved AOD to calculate PM2.5 concentration fully reflects the advantages of GOCI as a geostationary satellite in spatial resolution and temporal resolution. In terms of spatial resolution, the spatial resolution of AOD based on GOCI satellite reachs to 500 meters, which is better than MODIS 10 km AOD product.In terms of temporal resolution,hourly AOD monitoring from 9:00 to 16:00 based on GOCI can be obtained,which is better than MODIS twice daily AOD products. 相似文献