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1.
为了对北斗卫星无线电测定业务(Radio Determination Satellite Service,RDSS)报文与卫星无线电导航业务(Radio Navigation Satellite Service,RNSS)报文的控制实现功能集成,设计一种针对北斗用户终端模块的软件系统。基于前后台分离的设计思想来构架该软件,即后台线程负责使用串口与用户终端模块通信,包括对RDSS/RNSS数据的接收解析和对RDSS数据的封装发送;前台用户界面完成数据的可视化,并实现灵活的人机交互。前后台线程之间采用并发技术实现通信数据的快速处理。  相似文献   

2.
通过分析北斗卫星导航定位系统--无线电测位卫星系统(RDSS)和航位推算(DB)定位系统的特点,提出了基于ARM处理器的RDSS/DR车载远程监控报警系统;并用联合卡尔曼滤波算法对组合监控报警系统的数据进行融合处理.本系统提高了数据处理的速度和精度,同时使定位精度达到了一个比较理想的水平.  相似文献   

3.
介绍了一种高可靠、高精度、低成本的箭载无线定位装置;通过解算北斗系统卫星导航电文,实时获取安装位置的定位数据;利用北斗系统RDSS业务短报文通信功能,将定位数据发送给地面手持终端,从而辅助地面搜寻人员快速找到火箭残骸;在产品设计中,除考虑功能性能指标实现外,还针对设备的可靠性开展了大量工作,从导航信号的自主可控性、上下行通信链路的裕度、设备工作的环境适应性以及重要模块的冗余设计等方面进行了总体方案设计;经飞行试验验证,该无线定位装置水平定位精度优于5 m,实现了残骸回收“下车即见”的预定目标。  相似文献   

4.
基于超声波技术的3D定位系统研制   总被引:4,自引:0,他引:4  
精确的位置信息是B3G移动通信系统实现普适计算功能的要求,提供位置信息的系统必须是低成本、低电子复杂性、放置方便和多目标定位的;系统由中心节点、超声波接收传感器节点和超声波发射信标节点通过无线通信链路构成定位网络;信标节点和多个传感器节点在中心节点通过无线通信链路的协同下分别测出超声波在它们之间的视距传播时间,进而依据已知的传感器节点位置和声速,利用最小二乘法计算出信标节点的位置;给出了本定位系统的组成框架、定位算法、基于nRF2401无线收发模块建立无线通信链路的MAC协议和超声波收发时间差的修正方案;本定位系统达到了设计目标,实验结果表明定位精度也满足应用要求.  相似文献   

5.
任勇峰  程艳  文丰  储成群 《计算机测量与控制》2015,23(3):1052-1054,1057
针对沙漠、戈壁等特殊环境下,飞行器飞行试验落点快速搜索问题,提出了一种基于GPS与铱星Iridium9523的信标机设计方法,利用GPS模块实时获取飞行器飞行试验过程中的位置信息,同时利用铱星的全球移动通信链路实时转发,最终将位置信息发送至地面试验人员,实现被测目标的实时定位;设计的信标机结构简单,功耗低,定位精度高;多次实地测试表明,该设备能够可靠的完成定位信息的获取与转发,其水平位置精度2.3m,具有良好的应用前景。  相似文献   

6.
基于北斗卫星的自动气象站数据传输管理系统   总被引:3,自引:0,他引:3  
针对北斗短报文单次通信数据量限制自动气象站数据传输的问题,设计了基于北斗卫星的自动气象站数据传输管理系统。系统由FPGA处理器模块、北斗模块和外部检测控制模块组成。系统通过LZW编码和Huffman编码实现气象数据的高效无损压缩传输;系统基于北斗短报文实现对自动气象站的远程管理;系统具有自动检测和管理功能。目前,该系统已通过验证,气象数据传输效率提高了3倍,解决了北斗短报文单次通信数据量限制气象数据传输的难题,提高了对自动气象站的远程管理能力。  相似文献   

7.
伪卫星在北斗导航系统中的布局研究   总被引:1,自引:0,他引:1  
目前我国的北斗导航定位系统只能实现二维有源定位,这就大大限制了北斗导航系统的应用;采用伪卫星不但可以辅助增强北斗定位系统实现三维无源定位,提高定位精度,而且也可以单独组网并在区域范围内代替卫星导航系统进行独立定位;由于卫星定位系统的精度与卫星数目以及几何布局有着很大的关系,应用拉格朗日法,通过数学推导和仿真分析,研究了伪卫星数目以及布局对系统定位精度的影响,得出了伪卫星布局的相应结论。  相似文献   

8.
目前,国外大多数采用GPS通信相对比北斗通信精度更加准确,为了能够提高北斗的大大推广与使用,北斗短报文通信在国内展开一系列的应用。北斗在国内的优势主要体现在方方面面。例如,北斗短报文通信在生活中,军用方面等起着不可替代的作用。通信抄表中,海上船员健康监测中,泥石流监测系统中。[1]根据北斗短报文的广泛应用,分析北斗短报文通信的基本性能,设计了基于Labwindows/CVI的上位机北斗短报文通信软件,软件与系统硬件的传输由Visual C++开发的串口通信调用RS232接口驱动程序完成。进行完成北斗短报文的通信,能够完成自检信息和IC地址的检测,根据用户的操作可以每间隔60秒进行一次接收与发送通信。最终通过测试顺利完成了基于Labwindows/CVI的上位机北斗短报文通信。  相似文献   

9.
针对北斗(BD)和WiFi单一系统定位精度不高和定位盲区问题,提出一种基于北斗差分与WiFi的室内外融合定位方法。根据北斗和WiFi异构网络建立多属性代价函数,优选参与定位信标及卫星组合;采用反距离加权内插的多基准站伪距差分法,修正北斗伪距方程减小空间伪距误差;构建基于接收信号强度指示(RSSI)传播模型的WiFi测距方程,并融合北斗差分伪距方程,通过泰勒迭代算法实现精确定位。实验结果表明:融合定位精度在95%的概率下优于2. 6 m,定位性能优于北斗和WiFi单独定位,有效解决了单一系统的定位缺陷和定位盲区问题,实现了室内外无缝融合精确定位,提高了定位精度和可靠性。  相似文献   

10.
《信息与电脑》2021,(1):123-125
本文采用高性能STM32单片机作为控制系统,通过北斗/GPS双模定位模块及有源天线采集定位数据,并用上位机显示PVT信息,最终实现了成本低、延展性强、可广泛应用的双模定位系统。通过外场测试验证发现,该系统的定位精度较高,具有较强的实用性。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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