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系统仿真学报 2008年第23期20卷 6494-6497页

作者：裴福俊居鹤华崔平远北京工业大学电子信息与控制工程学院北京100022 哈尔滨工业大学深空探测基础研究中心哈尔滨150001

针对基于Unscented卡尔曼滤波(UKF)的神经网络训练学习方法存在的计算量大,实时性差的问题,提出了一种基于Kalman/UKF组合滤波原理的神经网络学习方法,该方法综合了Kalman滤波对线性系统和UKF对非线性系统的最优估计的优势,在保证神经... 详细信息

针对基于Unscented卡尔曼滤波(UKF)的神经网络训练学习方法存在的计算量大,实时性差的问题,提出了一种基于Kalman/UKF组合滤波原理的神经网络学习方法,该方法综合了Kalman滤波对线性系统和UKF对非线性系统的最优估计的优势,在保证神经网络权值估计精度的同时,有效降低了神经网络权值学习的计算量,提高了神经网络训练的实时性。最后将该利用方法训练的神经网络应用于惯性导航系统的非线性初始对准过程中,并进行了仿真研究。仿真结果表明利用提出的算法训练的神经网络与基于UKF训练的神经网络具有相同的对准精度和实时性,而提出的算法的有效降低了神经网络训练的计算量,提高了训练的运行效率,是解决惯性导航系统初始对准的一种有效和实用的方法。

关键词： Unscented 卡尔曼滤波组合滤波神经网络初始对准

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Theoretical analysis of direct-finding targets with rolling-airframe passive radar by phase interference technique

Theoretical analysis of direct-finding targets with rolling-...

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2.06 CIE International Conference on Radar

作者： Xi Wei1 Yu BianZhang 1 Wang SongShan 2.1.School of Electronic and Information Northwestern Polytechnical University Xi’an 710068 china 2.Xi’an Research Institute of navigation {2. Xi’an 710068 china.

From the point of positioning principle regard to the passive with rolling-airframe,this article derives a new testing formula for the angle between aim line of target and axis of missile,introduces a measurement method of time-difference by using true time delay with optical *** analyze the reason of angle ambiguity phase interferometer with single baseline,and also compare the advantage of measuring time-difference method with *** simulate the process of the phase interferometer of the rolling-airframe *** approach provides a new access to develop and manufacture phase interferometer with rolling-airframe.

关键词： Terms-rolling-airframe phase interferometer measure of time difference

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Intelligent Adaptive Backstepping Controller Design Based on the Adaptive Particle Swarm Optimization

Intelligent Adaptive Backstepping Controller Design Based on...

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2.09中国控制与决策会议

作者： Xie Xiaozhu~1,Liu Zaozhen~2.Cui Weining~1 1.Department of Information Engineering,Academy of Armored Force Engineering,Beijing 100072.2.School of space navigation {2.,Beijing Institute of {2.,Beijing 100081

＜正＞An improved adaptive backstepping controller design method is proposed for a single input and single output nonlinear system with uncertainty and unknown *** controller expression with undetermined parameters can be acquired by using adaptive backstepping design idea,and the controller parameters are optimized on using the adaptive particle swarm optimization （APSO）.The backstepping controller can overcome the plant uncertainties and ensure the robust stability of *** APSO is used to offset the disturbance and improve the tracking *** experimental showed the method effectual.

关键词： Uncertainty and unknown parameter Adaptive Backstepping Adaptive Particle Swarm Optimization

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The impact of carrier leakage and spectral asymmetry distortions on the performance of navigation signals

The impact of carrier leakage and spectral asymmetry distort...

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第三届中国卫星导航学术年会

作者： HE Cheng-yan 1,2.3 , GUO Ji 1 , LU Xiao-chun 1,2., WANG Xue 1,2., LIU Feng 1,2.3 1 National Time Service Center, Chinese Academy of Sciences, No.3 Shuyuan East Road, Lintong, Xi''an, Shaanxi, 710600, china 2.Key laboratory for Precise {2., positioning and Timing of Chinese Academy of Sciences, Lintong, china 3 Graduate University of Chinese Academy of Sciences, Beijing, 100190, china

In the process of analog modulation, carrier leakage will be possible if the carrier of orthogonal modulator leak to its output, with additional carrier appear at carrier frequency. What’s more, transmitter filters and power amplifier saturation may lead to spectral asymmetry. To further study the impact of these distortions on navigation signals performance, this paper begins to introduce the mechanism of carrier leakage and spectral asymmetry. Then based on a new Matlab platform and mathematical models, the impact of these distortions on signal performance is comprehensively demonstrated from different aspects from SNR （Signal-Noise-Ratio）, acquisition and tracing, to ranging accuracy, etc,. Results show that low degree of carrier leakage and spectral asymmetry won’t significantly affect signal performance, but when it deteriorates to a certain degree, the performance of navigation signals would exponentially decline. Those results and data we have obtained from this paper can also be used as a valuable reference for signal-on-board-generation designers in the process of signal design and optimization.

关键词： carrier leakage spectral asymmetry navigation signal performance affection simulation analysis

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A fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope

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Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 51-55页

作者： WANG TianZhou1,2.QIU YuLei1,CAI HongBo1 & DENG JingSong1 1 National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012.china 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

The space multi-band Variable Object Monitor(SVOM) is a proposed Chinese astronomical satellite,dedicated to the detection,localization and measurement of gamma-ray bursts(GRBs) on a cosmological *** efficient algorithm is developed for the purpose of onboard star extraction from the CCD images obtained with the Visible Telescope(VT) onboard the *** CCD pixel coordinates of the reference stars will be used to refine the astronomical position of the satellite,which will facilitate triggering rapid ground-based follow-up observations of the *** this algorithm,the image is divided into a number of grid cells and the "global" pixel-value maximum within each cell is taken as the first-guess position of a "bright" *** correct center position of a star is then computed using a simple iterative *** two additional strategies,i.e.,scanning the image only by even(or odd) lines or in a black-white chess board mode,we propose to further reduce the time to extract the *** examine the efficiency of the above algorithms,we applied them to the experimental images obtained with a ground-based *** find that the accuracy of the astronomical positioning achieved by our method is comparable to that derived by using the conventional star-extraction method,while the former needs about 2. times less CPU time than the *** will significantly improve the performance of the SVOM VT mission.

关键词： gamma-ray burst(GRBs) SVOM VT on board computation

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A Parameter Adaptive Recursive Least Squares Filter for SINS/SAR Integrated navigation Systems

A Parameter Adaptive Recursive Least Squares Filter for SINS...

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2.10 International Symposium on Inertial technology and navigation

作者： ZHENG Xin~(1,2.,WANG Wen-hui~2.LI Bang-qing~2.(1.School of Information Science and technology,Beijing Institute of technology,Beijing 100081,{2. 2.Beijing Institute of Automatic Control Equipment,Beijing 100074,{2.)

＜正＞The strapdown inertial navigation system（SINS）/synthetic aperture radar（SAR） integrated navigation system is researched in this *** position information of the SAR corrects the accumulative error of the SINS to aid the navigation ***,the SAR measurements are fairly few in aircraft or missile ***,the time delay for the SINS receiving the SAR positioning result varies from time to *** means that the statistical characteristic of integrated navigation system measurement errors differ from each *** order to solve the above-mentioned problems,a parameter adaptive recursive least squares（PARLS） filter for SINS/SAR integrated navigation systems is *** statistical characteristics of measure errors are estimated online and adaptively ***,an adaptive fading factors based on the orthogonality principle is introduced to effectively track the states’ *** PARLS filter algorithm is deduced. Additionally simulation results are presented to demonstrate the feasibility and effectiveness of the proposed approach.

关键词：

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Application of Compass Ionospheric Model in GNSS positioning

Application of Compass Ionospheric Model in GNSS Positioning

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第三届中国卫星导航学术年会

作者： Wu XiaoLi1Hu XiaoGong2..Wang Gang1*Zhong HuiJuan3&Tang ChengPan2.. Beijing Global Information Center of Application and Exploration, Beijing 100094, china 2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 2.0030, china 3. china Defense Science technology Information Center, Beijing 100142. china

As an important component of a GNSS navigation message, ionospheric delay model parameters are broadcasted for single-frequency users to improve their positioning accuracy. GPS provides daily Klobuchar ionospheric model parameters based on geomagnetic reference frame, while the regional satellite navigation system of Compass broadcasts an eight-parameter ionospheric model generated by processing real data from continuous monitoring stations, which is updated every 2.hours. To evaluate model performance, model predictions are compared against real ionosphere measurements, along with positioning accuracy comparisons. Real data analysis indicates that the Compass ionospheric model provides higher correction precision in middle-latitude regions, but relatively lower correction precision for low-latitude regions where ionosphere possesses much more variability. Thanks to the constellation design of Compass, ionospheric model errors for some receivers manifest a common bias for in-coming GNSS signals from different satellites. Consequently, ionospheric model errors are somehow translated into the receivers’ clock error estimation, while have less influence on the positioning. Given that the Chinese global navigation system will still rely on a domestic continuous monitoring network to provide global ionosphere correction service, the applicability of the ionospheric model in regions beyond china’s mainland is studied by applying the regional model to single-frequency positioning experiments of GPS. Real data analysis shows that in the northern hemisphere areas including Asia, Europe and North America, compared with the GPS single-frequency positioning using Klobuchar model for ionospheric delay corrections, the three-dimension position accuracy is improved by 7.8% 35.3% by using the Compass model. But the positioning accuracy in the southern hemisphere is degraded by 9.5%3.5% due to the lack of monitoring stations there.

关键词： ionospheric model regional satellite navigation system model error positioning error

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Design of Integrated navigation System Based on Information Fusion technology

Design of Integrated Navigation System Based on Information ...

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第二十四届中国控制会议

作者： Chunmei Huang~(1,2., Yantao Tian~1, Wanxin Su~3, Yuhua Wang~2.1. School of Communications, Jilin university, Changchun 13002. china) 2. Changchun University of technology, Changchun 130012.3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences Changchun 130033

With the rapidly development of science and technology. The single navigation system for {2. and orientating is not adequate for the requirement of navigation, position, and orientation in the field of military and civil. The higher precision and cheaply cost of integrated navigation system are gradually applied for every field. Therefore, the combination of GPS and INS constitute the integrated navigation system becoming a developmental direction. This thesis discusses the technology problem and calculation methods of GPS/GLONASS/INS integrated navigation system. Firstly, it summarizes the merit and demerit of GPS and INS navigation system respectively. Putting forward the GPS/GLONASS/INS integrated navigation system based on information fusion technology. Also, a new method of GPS/GLONASS/INS integrated navigation system for quick {2. and orientating is presented, on the basis of which the scheme and the principles are given. Then a multi-sensor information fusion algorithm based on federal kalman filter is analyzed in detail. Finally, the computer simulation is given. The results show that federal kalman filter can deal with information fusion for the GPS/GLONASS/INS integrated system. Efficiently improving the accuracy and the reliability of the navigation system. It is the best way for seeking the navigation parameter and lead to the GPS/GLONASS/INS integrated system acquiring superior performance.

关键词： GPS INS information fusion integrated navigation federal Kalman filter

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Common-View Time Transfer based on COMPASS GEO Satellite

Common-View Time Transfer based on COMPASS GEO Satellite

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第三届中国卫星导航学术年会

作者： KONG Yao 1,2.3,YANG Xu-hai 1,2.SUN Bao-qi 1,2. (1.National Time Service Centre,Chinese Academy of Sciences,Xi′an 710600,china 2.Key laboratory of Precise {2.,positioning and timing,National Time Service Center, Chinese Academy of Sciences,Xi′an 710600,china 3.Graduate University of Chinese Academy of Sciences,Beijing 100039,china)

The GPS common-view（CV）time transfer method was used by lots of timing laboratories for accurate time *** accuracy of GPS common-view is up to a few *** with GPS,The COMPASS system is at the experimental *** order to test the capability of Compass common-view,The experiment were carried out between Changchun station and Kashi Station in September in *** receivers were installed in stations and the receivers were also connected to Cs atomic *** the experiment,the COMPASS-GEO satellites are observed by the two *** data were processed as ***,the raw COMPASS observation data were preprocessed,including outliers deletion、cycle slip detection and ***,the propagation error was *** ionosphere delay was calculated by using the dual frequency data of the COMPASS *** Hopfield model was used to compute the troposphere ***, utilizing precise ephemeris and accurate antenna coordinate,the clock difference of the two receivers was calculated with common-view method by COMPASS GEO *** result shows that the accuracy of COMPASS common-view can reach to that of GPS common-view.

关键词： GPS common-view COMPASS ionospheric delay GEO

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Integrated Design and Accuracy Analysis of Star Sensor and Gyro on the Same Benchmark for Satellite Attitude Determination System

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IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1074-1080页

作者： Bowen Hou Zhangming He Haiyin Zhou Jiongqi Wang the College of Liberal Arts and Science National University of Defense TechnologyChangsha 410072China Beijing Institute of Control Engineering China Academy of Space TechnologyBeijing 100080China

As an important sensor in the navigation systems,star sensors and the gyro play important roles in spacecraft attitude determination *** environmental factors are the main sources of error in attitude *** error influence of different benchmarks and the disintegration mode between the star sensor and the gyro is analyzed in *** integrated design of the star sensor and the gyro on the same benchmark can effectively avoid the error influence and improves the spacecraft attitude determination *** results indicate that when the stars sensor optical axis vectors overlap the reference coordinate axis of the gyro in the same benchmark,the attitude determination accuracy improves.

关键词： Accuracy analysis attitude determination gyro integrated design same benchmark star sensor

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