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针对火星探测环绕段自主导航需求,结合初始轨道参数及光学导航相机拍摄的火星图像,提出了一种基于火星本体的高精度自主导航方法。该方法首先利用初始轨道参数得到火星在导航相机像平面下的投影图,然后将该投影图与导航相机拍摄的火星图进行匹配融合得到火星的边缘图,后利用该边缘图进行精确椭圆拟合,继而可实现器-火视线距和视线矢量的测量,在算法仿真过程中充分考虑到了工程实现中可能会遇到的图像旋转、平移及尺寸变换问题,仿真结果表明:提出的利用先验信息的图像融合测量算法较单独利用火星图像进行导航测量的方法,精度和可靠度均有较大提升,可满足火星探测环绕段的任务需求。 相似文献
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军事导航系统的分类 ·导航系统技术上可以分为无线电导航和自主式导航系统. ·无线电导航包括陆基无线电导航、卫星导航和基于无线网络的导航. ·自主式导航包括惯性导航、多卜勒导航和地形辅助导航. ·无线电导航可以与自主式导航组合在一起,形成组合导航. 相似文献
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车载自主导航系统的现状和发展趋势 总被引:2,自引:0,他引:2
讨论了车载自主导航系统的体系结构,技术发展现状,趋势,市场现状和趋势,提出建立我国车载自主导航的产业化支撑体系,实现我国车载自主导航的产业化。 相似文献
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卫星密集编队中关注度比较高的小卫星编队,它主要是由一系列微小型卫星组合而成。它的主要特点是可以自主导航。这就要求卫星可以对星间相对状态实时进行测量,其中的一个重要环节就是星间测距。 相似文献
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The use of satellite technology for oceanic air traffic control 总被引:1,自引:0,他引:1
Massoglia P.L. Pozesky M.T. Germana G.T. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1989,77(11):1695-1708
The authors discuss the use of satellite technology for communications, navigation, and surveillance within the context of providing air traffic services and control to aircraft operating in US oceanic airspace. Particular emphasis is placed on automatic dependent surveillance, a technique that uses satellite communications channels to relay position data generated by an aircraft's on-board navigation system. Using these same channels, reliable, timely, and direct pilot/controller communications can be provided within the oceanic environment 相似文献
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Interactive 3-D virtual colonoscopy system 总被引:5,自引:0,他引:5
Tong-Yee Lee Ping-Hsien Lin Chao-Hung Lin Yung-Nien Sun Xi-Zhang Lin 《IEEE transactions on information technology in biomedicine》1999,3(2):139-150
We describe a low-cost three-dimensional (3-D) virtual colonoscopy system that is a noninvasive technique for examining the entire colon and can assist physicians in detecting polyps inside the colon. Using the helical CT data and proposed techniques, we can three-dimensionally reconstruct and visualize the inner surface of the colon. We generate high resolution video views of the colon interior structures as if the viewer's eyes were inside the colon. The physicians can virtually navigate inside the colon in two different modes: interactive and automatic navigation, respectively. For automatic navigation, the flythrough path is determined a priori using the 3-D thinning and two-pass tracking schemes. The whole colon is spatially subdivided into several cells, and only potentially visible cells are taken into account during rendering. To further improve rendering efficiency, potentially visible cells are rendered at different levels of detail. Additionally, a chain of bounding volume in each cell is used to avoid penetrating through the colon during navigation. In comparison with previous work, the proposed system can efficiently accomplish required preprocessing tasks and afford adequate rendering speeds on a low-cost PC system 相似文献
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构建中国因特网信息导航系统面临的主要问题 总被引:5,自引:0,他引:5
本文介绍了开发大型因特网中文信息导航中心所需解决的主要技术问题,包括信息导航中心结构、搜索引擎、中文信息自动标引分类和检索、硬件设备和网络环境、导航相关服务、数据并发处理和全国导航分布体系等。 相似文献
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A novel approach to automatic navigation and map display is described. In order for a navigation and display system to be both cost effective and useful in automobiles, solutions are needed to problems in navigation, map database, data storage, and display. 相似文献
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地形导航中的3D地形跟踪方法 总被引:1,自引:1,他引:0
地形跟踪技术是飞行器自动导航的基础,激光成像雷达可以高精度实时获取前视距离像和3D地形图,从激光成像雷达所成前视距离像中可以识别飞行器前下方的地形(包括障碍物),人而为飞行器毛皮地形跟踪提供基础,在飞行器惯性作用下,研究了飞行器自动障碍物回避方法,推导了飞行器与规划航迹之间的3D空间关系,以飞行器自动障碍物回避为基础,建立了飞行器沿规划航迹飞行的地形跟踪方程。在参考地形图上进行了仿真实验。结果表明,3D地形跟踪方法,能够很好的满足飞行器自动导航的要求。 相似文献