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2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics最新文献

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Low Rate Convolutional Codes based on extended CCK sequences in aeronautical communications 航空通信中基于扩展CCK序列的低速率卷积码
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776206
Chao Zhang, Min Gong, Yonghua Zhang, Jianhua Lu
{"title":"Low Rate Convolutional Codes based on extended CCK sequences in aeronautical communications","authors":"Chao Zhang, Min Gong, Yonghua Zhang, Jianhua Lu","doi":"10.1109/ISSCAA.2008.4776206","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776206","url":null,"abstract":"Low Rate Orthogonal Convolutional Codes (LROCC) have been confirmed an outstanding performance in AWGN channel with multiple users, such as the en-route situation in the aeronautical communications with several aircrafts. However, the orthogonal sequences in LROCC still suffer from multipath interference in fading channel, which degrades the performance in practical scenarios. In this paper, extended CCK sequences have been applied instead of orthogonal sequences to form the low rate convolutional codes, which enable the aeronautical communications system a strong capability in the multipath interference cancellation(e.g., low elevation flight).","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129846265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Research on three-axis six-DOF shaking table based on rapid prototyping of DSP algorithms using SIMULINK 基于DSP算法的三轴六自由度振动台的SIMULINK快速成型研究
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776177
Shen Gang, Cong Dacheng, He Jingfeng, Han Jun-wei
{"title":"Research on three-axis six-DOF shaking table based on rapid prototyping of DSP algorithms using SIMULINK","authors":"Shen Gang, Cong Dacheng, He Jingfeng, Han Jun-wei","doi":"10.1109/ISSCAA.2008.4776177","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776177","url":null,"abstract":"Three axes hydraulic shaking system as the means to recreate vibration environment can accurately reproduce reference power spectrum density and time history response. The vibration control is a key technique to meet the requirement. This paper introduces the principle of the three-axis six-DOF shaking table at first and then designs hardware system using TMS320C2812 to acquire the analog and digital variable and using TMS320C6713 to operate and communicate with S3C2410 via dual-RAM in order to improve real-time and rapidity of the system. In the end, this paper presents the implementation of a rapid prototyping control system, which involves the design of DSP algorithms using MATLAB Simulink blocksets, automated code generation in the CCS integrated development environment, and downloading of executable code to the Texas Instrumentspsila TMS320C2812 and TMS320C6713.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129326634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Study and simulating of adaptive array processing with effect of channel uniformity 考虑信道均匀性影响的自适应阵列处理的研究与仿真
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776169
Jianhong Xiang, Lili Guo, Heping Li
{"title":"Study and simulating of adaptive array processing with effect of channel uniformity","authors":"Jianhong Xiang, Lili Guo, Heping Li","doi":"10.1109/ISSCAA.2008.4776169","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776169","url":null,"abstract":"Adaptive anti-jam processing used by Global Positioning System (GPS) usually works in an environment where interferences exist. The Power-Inversion (PI) algorithm is often applied to suppress interferences in the system. But variance of amplitude and phase which exists among antenna channel takes bad effect on adaptive anti-jam processing and PI algorithm, so we do our best to research the relation between channel uniformity and adaptive processing. When variance of amplitude and phase is limited under the definite condition, paper proves PI algorithm can not only reject interferences, but also conquer channel uniformity on a certain degree by academic researching and simulating. The conclusion has the advantage to engineering applications.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129465394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Research on obstacle avoidance of redundant robots based on geometric models 基于几何模型的冗余机器人避障研究
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776217
Yu Liu, Bin Liang, Kui Sun, Yanshu Jiang
{"title":"Research on obstacle avoidance of redundant robots based on geometric models","authors":"Yu Liu, Bin Liang, Kui Sun, Yanshu Jiang","doi":"10.1109/ISSCAA.2008.4776217","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776217","url":null,"abstract":"The paper directs the mathematical models of the sphere and the column obstacles for a redundant robot, which can be looked on as a reference for other complex shaped obstacles. Based on the models, the performance criterion function of obstacle avoidance is presented in light of artificial potential field method. Subsequently, through optimizing the performance criterion the simulation of obstacle avoidance is studied. At last, the experiment of obstacle avoidance of a 7-DOF redundant robot is carried out, which verifies the validity of the built models.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129686396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Fuel and time optimal transfer of spacecrafts rendezvous using Lambert’s theorem and improved genetic algorithm 基于Lambert定理和改进遗传算法的航天器交会燃料和时间最优转移
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776390
Dawei Zhang, Shen-min Song, G. Duan
{"title":"Fuel and time optimal transfer of spacecrafts rendezvous using Lambert’s theorem and improved genetic algorithm","authors":"Dawei Zhang, Shen-min Song, G. Duan","doi":"10.1109/ISSCAA.2008.4776390","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776390","url":null,"abstract":"The two coplanar elliptic-to-elliptic orbits transfer with two-impulse is considered in this paper. The problem is the rendezvous of two spacecrafts, and the target spacecraft is not fixed in its orbit, but keep moving as same as the tracing spacecraft. To solve the problem, the transfer time is computed using Lambertpsilas theorem and iterative algorithm. And improved genetic algorithm is also used to optimize objective function, which is the tradeoff between minimum-time and minimum-fuel. The other method to solve the problem uses improved genetic algorithm and Lambertpsilas theorem, which avoids the iterative algorithm. The simulations and orbital figures of simulation results show the feasibility and validity of the arithmetic proposed in this paper.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129802434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Control of terminal engagement geometry using variable structure guidance law with impact angular constraint 带冲击角约束的变结构制导律末端啮合几何控制
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776345
Zhang Li, Sun Weimeng, Zheng Zhiqiang
{"title":"Control of terminal engagement geometry using variable structure guidance law with impact angular constraint","authors":"Zhang Li, Sun Weimeng, Zheng Zhiqiang","doi":"10.1109/ISSCAA.2008.4776345","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776345","url":null,"abstract":"This paper proposes a new guidance law for the impact angle control, using the variable structure control theory. The guidance law has the ability to simultaneously achieve design specifications on miss distance and final missile-target relative orientation. The latter specification may be used to enhance the performance of warheads whose effectiveness is influenced by the terminal encounter geometry between missile and target. The variable structure guidance law is parameterized with terminal conditions of miss distance and terminal encounter angle. Feasibility of the variable structure guidance law is demonstrated by the simulation. According to the simulation results, the guidance law is shown to perform well against an air target performing evasive maneuvers. The specified zero aspect terminal encounter angle is achieved while simultaneously minimizing the miss distance.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130548411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
The study on oscillations of an opposing jet flow 对喷流振荡的研究
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776290
Chen Jin, Zhenqing Wang, H. Lv, Cuie Zhang, Yongjun Wang
{"title":"The study on oscillations of an opposing jet flow","authors":"Chen Jin, Zhenqing Wang, H. Lv, Cuie Zhang, Yongjun Wang","doi":"10.1109/ISSCAA.2008.4776290","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776290","url":null,"abstract":"The oscillations of the flow field around a hemispherical nose with a supersonic opposing jet in a free stream of Mach 3.98 are computed. Two total pressure ratios of a jet to a free stream 0.2 and 0.6 are examined, which correspond to unsteady flow and steady flow, respectively. The axisymmetric Navier-Stokes equations with Shear-Stress Transport (SST) turbulence model are used as the governing equations in this paper. The oscillations of the flow field are reproduced, and mechanism of the oscillations is analyzed. Time-accurate algorithm is found to be necessary when an opposing jet flow field is solved, even for stable flow field. The time-averaged density distribution obtained in this paper is in good agreement with schlieren photograph. Also, the wall heat flux predicted in this paper is in agreement with experimental result.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126709823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An edge detection method for infrared image based on grey relational analysis 一种基于灰色关联分析的红外图像边缘检测方法
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776163
Dongzhu Feng, Xin Wang, Yuhe Liu
{"title":"An edge detection method for infrared image based on grey relational analysis","authors":"Dongzhu Feng, Xin Wang, Yuhe Liu","doi":"10.1109/ISSCAA.2008.4776163","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776163","url":null,"abstract":"Edge is the boundary between an object and its background. They represent the frontier for single objects. Therefore, if the edges of imagepsilas objects can be identified with precision, all the objects can be located and their properties such as area, perimeter, shape, etc, can be calculated. It is important to identify the precise edge in infrared imaging guidance system. In the full paper we explain in detail how to use the grey relational analysis effectively to detect the edge precisely. First, we use the grey relational analysis to finish the edge detection. During the edge detection, the formula of grey relational analysis is different from the traditional edge detection which also based on the grey relational analysis. And the value of the referential sequence is also different from the tranditional one. Then we use the Zhang-Suen thinning algorithm to get the skeleton of the edge. The result show that our method can detect and obtain more precise edge pixels. In all cases, our algorithm gives improved results when compared to some more popular edge detection methods.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123848863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Novel electromagnetic rotor position sensor for brushless DC machine in aviation and aerospace industry 航空航天工业无刷直流电机用新型电磁转子位置传感器
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776212
Qiang Fu, Hui Lin, Juan Wei
{"title":"Novel electromagnetic rotor position sensor for brushless DC machine in aviation and aerospace industry","authors":"Qiang Fu, Hui Lin, Juan Wei","doi":"10.1109/ISSCAA.2008.4776212","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776212","url":null,"abstract":"In order to implement an aviation or aerospace brushless DC machine servo control system in a high-temperature hostile environment, a novel electromagnetic rotor position sensor was designed. Concentrated excitation coils were symmetrically mounted at the middle of the stator inner circumference notches and the pickup ones were wound around the stator teeth. The rotor outer circumference was cut to form sunken right-angled sectors at the corresponding positions of the magnetic S poles on the machine rotor. With the magnetic field excited by a relatively high frequency sinusoidal current, the detected signals were modulated by the machine rotor position, as the total mutual inductance between one pickup coil and all the excitation ones varied as a function of the sensor rotor position. As all magnetic iron cores were laminated from new soft magnetic alloy ultra-thin sheet, the excitation current frequency may be increase to 100 KHz. Moreover a linear model and an equivalent-magnetic-circuit model were set up and based on the later, the sensor geometry parameters were optimized by a simulated annealing algorithm. An infinite element analysis was done in ANSYS software program and an experiment system was also built up. Both the simulation and the experiment results revealed the validity and reliability of the whole scheme.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123907736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Improving the evidence combination formulas of D-S Evidential Theory in medical information fusing 改进D-S证据理论在医学信息融合中的证据组合公式
2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics Pub Date : 2008-12-01 DOI: 10.1109/ISSCAA.2008.4776191
Yinjing Guo, Ruiduo Geng, Ting Wang, Xian-Qing Chen, Youfeng Chen
{"title":"Improving the evidence combination formulas of D-S Evidential Theory in medical information fusing","authors":"Yinjing Guo, Ruiduo Geng, Ting Wang, Xian-Qing Chen, Youfeng Chen","doi":"10.1109/ISSCAA.2008.4776191","DOIUrl":"https://doi.org/10.1109/ISSCAA.2008.4776191","url":null,"abstract":"One of the key technique in information fusion research is to fuse incomplete information acquired from multi-sensors using D-S Evidential Theory. Because of the shortcomings of D-S Evidential Theory, there are certain limitations in evidential theory applications. An improving method based on D-S Evidential Theory is put forward in this paper. A research is done in improving Yager combined formulas. From the comparisons, the result is obviously that the improving formulas are more advanced than the old ones. Furthermore the improving formulas have more value in theory and practice.","PeriodicalId":188024,"journal":{"name":"2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics","volume":"296 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124240676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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