检索结果-南通市图书馆

Research on AutoNav-Guiding technology for Airplane Taxiing

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research on AutoNav-Guiding Technology for Airplane Taxiing

第三届中国卫星导航学术年会

作者： Wu Hai-tao1 2 Zou De-cai1 2 Han Tao1 2 Lu Xiao-chun1 2 1.National Time Service Center Chinese Academy of Sciences Xi’an 710600 china 2.key laboratory of precision navigation and timing technology Chinese Academy of Sciences Xi’an 710600 china

Aircraft taxiing on the ground can reach or leave from parking bay with the help of"FOLLOW ME"airport guide car,a process that requires a lot of manpower,material and financial *** the extensive use of Satellite-based navigation system and the rapid development of modern communication technology and automatic control technology,this paper presents and studies aircraft automatic guidance technology to replace the airport guide car during airplane *** basic idea is that,based on the landing PVT information provided by GNSS navigation equipment onboard the aircraft,control tower planes aircraft taxiing routes after landing automatically according to airport GIS data and the actual airport flight schedule,and sends to the aircraft crew through wireless communication *** crew will match the real-time aircraft GNSS positioning information to the taxiing route provided by control tower using finite element theory coordinates matching *** matching results will be shown on the cockpit Multi-Function Display（MFD）or on the Head-up Display of windshield glass with the flashing arrows to guide the pilot taxiing under the established ***-guiding technology occupies a certain advantage in the implementation complexity,cost,size and energy consumption compared to aircraft taxiing with the help of airport guide car,and auto-guiding technology can also be used for the machine automatic guidance in the other places.

关键词： AutoNav-Guiding taxiing route finite element coordinates matching

A virtual reference satellite differential method for relative correction of satellite ephemeris errors

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第12期53卷 2300-2306页

作者： CAI ChengLin 1,3 , LI XiaoHui 2,3 & WU HaiTao 2,3 1 Gulin University of Electronic technology, 541004, china 2 National Time Service Center, Chinese Academy of Sciences, Lintong 710600, china 3 key laboratory of precision navigation and timing technology, National Time Service Center, Chinese Academy of Sciences, Lintong 710600, china 1. Gulin University of Electronic technology Gulin 541004 China3. Key Laboratory of Precision Navigation and Timing Technology National Time Service Center Chinese Academy of Sciences Lintong 710600 China2. National Time Service Center Chinese Academy of Sciences Lintong 710600 China

In order to solve the problems that the novel wide area differential method on the satellite clock and ephemeris relative correction (CERC) in the non-geostationary orbit satellite constellation, a virtual reference satellite (VRS) differential principle using relative correction of satellite ephemeris errors is proposed. It is referred to be as the VRS differential principle, and the elaboration is focused on the construction of pseudo-range errors of VRS. Through qualitative analysis, it can be found that the impact of the satellite’s clock and ephemeris errors on positioning can basically be removed and the users’ positioning errors are near zero. Through simulation analysis of the differential performance, it is verified that the differential method is universal in all kinds of satellite navigation systems with geostationary orbit (GEO) constellation, Medium orbit (MEO) constellation or hybrid orbit constellation, and it has insensitivity to abnormal aspects of a satellite ephemeris and clock. Moreover, the real time positioning accuracy of differential users can be maintained within several decimeters after the pseudo-range measurement noise is effectively weakened or eliminated.

关键词： wide area differential method virtual reference satellite (VRS) satellite ephemeris errors satellite clock errors constellation

A study on volunteer augmentation navigation technology

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2011年第6期54卷 1029-1034页

作者： WU HaiTao 1,2,LU XiaoChun 1,2,ZOU DeCai 1,2 & HAN Tao 1,2 1 National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,china 2.key laboratory of precision navigation and timing technology,Chinese Academy of Sciences,Xi’an 710600,china 1. National Time Service Center Chinese Academy of Sciences Xi’an 710600 China2. Key Laboratory of Precision Navigation and Timing Technology Chinese Academy of Sciences Xi’an 710600 China

navigation augmentation technology is one of the most common methods to increase the continuity,reliability and integrity of the global satellite navigation *** concept of volunteer augmentation navigation (VNA) is proposed and the elements and topological structure of VNA are also analyzed in this *** study focuses on the neural network model that volunteers and ordinary users use modern communication information network to exchange self-organizing *** neural cell model of Volunteer Augmentation navigation using shared information is *** interactive general relative positioning is *** basic theories and methods of volunteer augmentation navigation are formed on the basis of the above-mentioned *** study of realization mechanism of volunteer augmentation technology helps to form a relatively integral architecture of volunteer augmentation navigation.A user self-service satellite navigation augmentation which combines information exchange and navigation services may strengthen the continuity,reliability and integrity of the navigation *** volunteer augmentation navigation theory proposed in this paper improves the traditional satellite navigation application model and expands the connotation and denotation of satellite navigation augmentation methods.

关键词： volunteer augmentation navigation self-organizing information exchange interactive general relative positioning

Optical Fiber Sensor's Applied in Vibration Measurement of Turbine Blade

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 823-824页

作者： Fajie Duan, Zhiqiang Fang, Yuyang Sun State key Lab of precision Measuring technology & Instruments, Tianjin University, P. R. china State key Lab of precision Measuring technology & Instruments Tianjin University P. R. China

A new type optical fiber sensor--Tip timing Sensor is introduced in this paper. It is mostly used in vibration measurement of turbine blade, which can realize real-time and non-contact measurement.

关键词： of as Optical Fiber Sensor’s Applied in Vibration Measurement of Turbine Blade in

Analysis on the positioning precision of CAPS

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2009年第3期52卷 328-332页

作者： JI YuanFa1,2 & SUN XiYan1,2 1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, china 2 Applied Science and technology College, Guilin University of Electronic technology, Guilin 541004, china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. Applied Science and technology College Guilin University of Electronic Technology Guilin 541004 China

As a newly developed satellite positioning system, the Chinese Area Positioning System (CAPS) is a typical direct sequence spread spectrum ranging system like GPS. The positioning precision of such navigation signals depends on many factors, including the pseudo-code rate, the signal to noise ratio, the processing methods for tracking loops and so on. This paper describes the CAPS link budget, the solution approach for CAPS positioning, focusing on the autocorrelation function feature of C/A code signals. The CAPS signal measurement precision is studied by the software approach together with theoretical analysis of the range resolution. Because the conventional Delay Lock Loop (DLL) is vul- nerable to the impact of noise, a narrow correlator and multiple correlators as well as the corresponding discrimination methods of phases are proposed, which improves the robustness of DLL and the code-phase resolution of the measurement. The results show that the improvement of the DLL structure and the discrimination method are the most important way to improve the ranging resolution. Theoretical analysis and experimental results show that a CAPS receiver could reach a 20-m positioning precision by using three satellites with a supported height from an altimeter.

关键词： satellite navigation receiver narrow correlation tracking loop

Study on the Selection and Estimation of the Technique Index System of Time ＆ Frequency of Satellite navigation Systems

在线全文

学校读者我要写书评

暂无评论

Study on the Selection and Estimation of the Technique Index...

第三届中国卫星导航学术年会

作者： Ren Xiaoqian1,2, Hu Yu1,2, Wu Haitao1,2, Guo Wei1,2, Qin Weijin1,2 1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, china 2. key laboratory of precision navigation and timing technology, Chinese Academy of Sciences, Xi’an 710600, china

The satellite navigation system is based on the measurements of time ＆ frequency to achieve distance, position and velocity measurements. The positioning is one of the functions of the satellite navigation system. The paper is based on the analysis of working principle of the satellite navigation system and the characteristic of strong relevance of the technique index system. The technique index system to achieve the function of positioning is analyzed and discussed gradually. Meanwhile,the paper estimates the rationality of selected technique index system with the method of calculating relativity. Finally, the set of technique indexes to achieve the function of positioning restricted to the control of the main control station is determined. The achievement of the paper could provide the thought to design the system or test and estimate the satellite navigation system.

关键词： Time & Frequency Satellite navigation System Technique in- dex.

小型化光纤陀螺的轴向磁场误差特性建模方法探讨

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国惯性技术学报 2012年第1期20卷 84-89页

作者：王立辉徐晓苏刘锡祥蔡毓峰东南大学仪器科学与工程学院微惯性仪表与先进导航技术教育部重点实验室南京210096 国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室西安710119 天津航海仪器研究所天津300131

小型化光纤陀螺的主要特点是光纤环径向尺寸逐步缩小,而轴向尺寸逐步增大,由此导致轴向磁场误差成为影响小型化光纤陀螺精度的重要因素之一。以小型化光纤陀螺轴向磁场误差特性为研究对象,依据光纤环中光纤的四极对称排列结构,提出轴向... 详细信息

小型化光纤陀螺的主要特点是光纤环径向尺寸逐步缩小,而轴向尺寸逐步增大,由此导致轴向磁场误差成为影响小型化光纤陀螺精度的重要因素之一。以小型化光纤陀螺轴向磁场误差特性为研究对象,依据光纤环中光纤的四极对称排列结构,提出轴向螺旋角展开分析法,利用Jones矩阵分别构建保偏型光纤陀螺及消偏型光纤陀螺的传输矩阵及轴向磁场误差模型,探讨光纤扭曲应力寄生圆双折射、轴向尺寸等因素与非互易性Faraday磁场相位误差的关系,得出光纤陀螺轴向磁场漂移误差的数学描述,以此为理论依据,探讨小型化光纤陀螺的轴向磁场误差因素,并提出相应的措施。

关键词：小型化光纤陀螺磁场误差非互易相位误差漂移

Interoperability Feasibility Analysis between Beidou and GPS

在线全文

学校读者我要写书评

暂无评论

Interoperability Feasibility Analysis between Beidou and GPS

第三届中国卫星导航学术年会

作者： LU Xiaochun 1 2 LU Jun 3 WANG Xue 1 2 BAI Yan 1 2 4 HAN Tao 1 2 * 1. National Time Service Center Xi’an 710600 P.R.china 2. key laboratory of precision navigation and timing technology Chinese Academy of Sciences Xi’an 710600 P.R.china 3. Beijing Institute of Tracking and Telecommunications technology No.26 Beiqing road Haidian district Beijing china 4. Graduate School of the Chinese Academy of Science Beijing 100040 P.R.china

Interoperability has become a focus of Global navigation Satellite System （GNSS） and a development aspect, and incurs much focus among the world. For the purpose of maximum benefit, a series of interoperability researches and cooperation are putting forward. In this paper, according to the development of Beidou and GPS, we analyzed the interoperability feasibility between them as three phases. First of all, we introduced the signal plane of Beidou and GPS, separated their interoperability into three phases. After that, we analyzed the signal performance and service performance during each phases. Finally, based on the analyzing results, we offer a reference for Beidou signal design.

关键词： Interoperability signal performance service performance GDOP

An Improved PWCS Approach on Observability Analysis of Linear Time-Varying System

在线全文

cnki会议

学校读者我要写书评

暂无评论

An Improved PWCS Approach on Observability Analysis of Linea...

2009中国控制与决策会议

作者： KONG Xingwei~(1,2),GUO Meifeng~1,DONG Jingxin~1 1.State key laboratory of precision Measurement technology and Instruments,Department of precision Instruments and Mechanology,Tsinghua University,Beijing 100084,china 2.Engineering College,Air Force Engineering University,Xi''an 710038,china

＜正＞The piece-wise constant system（PWCS） observability analysis approach is an efficient method of analyzing the observability of linear time-varying *** improved approach is proposed to makes the analytical analysis simpler by eliminating redundant computation and simplifying the analysis *** the improved approach,the relation between the observability and the system status can be easily *** improved PWCS observability approach is used to analyze the strapdown inertial navigation system rapid transfer alignment model,which is a typical time-varying system.A simulation result validates the efficiency and advantage of the improved PWCS observability approach.

关键词： piece-wise constant system(PWCS) observability linear time-varying system rapid transfer alignment(RTA)