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Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)最新文献

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Convergence of socio-economic and technology factors in creating opportunities for a new workforce model 社会经济和技术因素的融合为新的劳动力模式创造了机会
B. J. Moore
The "information age" has finally produced tools capable of supporting a variety of employment and business models that previously were infeasible. The convergence of socio-economic factors, workforce composition, accelerating product obsolescence and technological advances has created an unparalleled need and fertile opportunity to redefine the workforce model. These new technological capabilities alone are insufficient to reinvent the business models. Management must, through vision and solid commitment at all hierarchical levels, migrate its values, reinvent precepts, coalesce processes, and redefine its workforce models to remain financially viable in the emerging compressed timelines. The tools are at hand; economic realities make corporate change a financial requirement; and the changing values, goals and social composition of the workforce apply pressure to create a new, network centric workforce model. These converging pressures make rethinking the corporation viable and necessary. How rapidly these changes occur will be determined now by old-fashioned rates of human I corporate acceptance of change. Compression of the market timeline may force significant, perhaps unrecoverable fallout among those companies that are slow to take up this challenge.
“信息时代”终于产生了能够支持各种以前不可行的就业和商业模式的工具。社会经济因素、劳动力构成、加速产品过时和技术进步的融合,为重新定义劳动力模式创造了前所未有的需求和丰富的机会。仅靠这些新的技术能力不足以重塑商业模式。管理层必须通过在所有层级上的远见和坚定的承诺,迁移其价值观,重新创造戒律,合并流程,并重新定义其劳动力模型,以在日益紧迫的时间线中保持财务上的可行性。工具就在手边;经济现实使企业变革成为一项财务要求;不断变化的价值观、目标和劳动力的社会构成给创造一种新的、以网络为中心的劳动力模式带来了压力。这些共同的压力使得重新思考公司变得可行和必要。现在,这些变化发生的速度将取决于人类对变化的接受程度。市场时间线的压缩可能会对那些缓慢接受这一挑战的公司造成重大的、或许是不可挽回的影响。
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引用次数: 2
Model-based RF ground moving target signature synthesis and analysis tool 基于模型的射频地面运动目标特征综合分析工具
A. Palomino, J. Schmitz
Describes a model-based moving target signature synthesis and analysis tool that leverages and integrates separate simulations for scenario generation, signature prediction, and moving target video phase history (VPH) synthesis with platform, sensor and target modeling. The integration provides a high-fidelity simulation that features computer-aided design (CAD) target models, electromagnetic scattering prediction codes, arbitrary target/sensor imaging geometries, aerospace sensor and platform modeling, and the specification of entity dynamics including interaction with terrain and road network data. The tool is ideal for generating moving target scenarios and data for the development and performance evaluation of radar-based automated ground target tracking and classification algorithms.
描述了一种基于模型的移动目标特征合成和分析工具,该工具利用并集成了场景生成、特征预测和移动目标视频相位历史(VPH)合成与平台、传感器和目标建模的单独仿真。该集成提供了高保真仿真,具有计算机辅助设计(CAD)目标模型、电磁散射预测代码、任意目标/传感器成像几何、航空航天传感器和平台建模,以及实体动力学规范,包括与地形和道路网络数据的交互。该工具是为基于雷达的自动地面目标跟踪和分类算法的开发和性能评估生成移动目标场景和数据的理想工具。
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引用次数: 0
A new sliding mode flux and speed observer for speed sensorless control of induction machine 一种用于异步电机无速度传感器控制的新型滑模磁链和速度观测器
N. Inanç, M. Guven, H. Rehman, A. Derdiyok, Longya Xu
In this paper a new sliding mode flux and speed observer is proposed for induction machine drive systems. The error between the actual and observed currents converges to zero which guarantees the accuracy of the flux observer. The rotor speed and the rotor time constant are estimated based on the estimated stator currents and rotor flux. The estimated rotor time constant is used in slip calculation and observer structures and the estimated speed is used as feedback to the speed regulation. Computer simulation results of the speed control verify the validity of the proposed speed estimation algorithm.
本文提出了一种用于感应电机驱动系统的新型滑模磁链速度观测器。实际电流与观测电流之间的误差收敛到零,保证了磁通观测器的精度。根据估计的定子电流和转子磁链估计转子转速和转子时间常数。将估计的转子时间常数用于转差计算和观测器结构,并将估计的转速作为调速的反馈。速度控制的计算机仿真结果验证了所提速度估计算法的有效性。
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引用次数: 3
Passive direction finding: combining amplitude and phase based methods 被动测向:结合基于振幅和相位的方法
C. Brinegar
The paper considers a direction finding system consisting of two squinted antennas that functions both as an interferometer and as an amplitude comparison system. The interferometer spacing is such that ambiguities exist, and a statistical analysis is used to describe the performance of using the amplitude based angle to select the correct ambiguous angle of incidence. The statistical analysis is at the system level so that no particular hardware implementation need be considered.
本文研究了一种由两个斜视天线组成的测向系统,该系统兼具干涉仪和幅度比较系统的功能。在干涉仪间距存在歧义的情况下,用统计分析方法描述了利用基于振幅的角度选择正确的歧义入射角的性能。统计分析是在系统级别进行的,因此不需要考虑特定的硬件实现。
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引用次数: 18
Performance evaluation of a fuzzy data association algorithm for multitarget tracking (MTT) 多目标跟踪模糊数据关联算法性能评价
S. Ermin, N. Sundararajan, P. Saratchandran
In this paper, a performance comparison of a recently developed fuzzy data association algorithm for multitarget tracking (MTT) with the well known joint probabilistic data association (JPDA) algorithm is presented. In this scheme, a fuzzy logic multiple models algorithm is constructed first. It uses different target models like constant velocity, constant acceleration etc. to describe all the states of the system. A Kalman filter is set up for each model to estimate their states. The final state estimate is a weighted average of the model conditioned estimates with the fuzzy reasoning. Based on this algorithm and after constructing the corresponding rule set, a fuzzy data association algorithm is developed, which uses full states, prior knowledge and experience. The simulation scenario considers both the fuzzy and JPDA algorithms for tracking two and four targets in a two dimensional setting. Based on the simulation results, the advantages and disadvantages of both the approaches for MTT are presented.
本文介绍了一种新的多目标跟踪模糊数据关联算法与联合概率数据关联算法的性能比较。该方案首先构造了一个模糊逻辑多模型算法。它使用不同的目标模型,如恒定速度,恒定加速度等来描述系统的所有状态。对每个模型建立一个卡尔曼滤波来估计它们的状态。最终状态估计是用模糊推理对模型条件估计的加权平均。在此基础上,在构造了相应规则集的基础上,提出了一种利用全状态、先验知识和经验的模糊数据关联算法。仿真场景考虑了模糊算法和JPDA算法在二维环境下对两个和四个目标的跟踪。在仿真结果的基础上,分析了两种方法的优缺点。
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引用次数: 2
An induction motor drive system performance enhancement using dynamically focused learning fuzzy controller 利用动态聚焦学习模糊控制器增强感应电机驱动系统性能
Mustafa K. Giiven, H. Rehman, A. Derdiyok, N. Inanç, Longya Xu
A Fuzzy Logic Controller (FLC), with a Dynamically Focussed Learning (DFL) algorithm is proposed, developed and implemented to improve the performance of an induction motor drive system. In standard direct fuzzy controller, utilization of the rule-base is mostly poor, especially when error input gets smaller and the control action is produced by only a few rules in the center of the rule-base. With such a small number of rules, the fuzzy controller performs inadequately because the resulting control surface can capture very approximate control actions. This poor utilization of the rule-base may degrade the controller performance. A possible solution to this problem may be to redesign the rule-base such that the rule base has move rules at the center. However, this solution limits the ability of the controller to a limited input range and specific inputs. Instead, a DFL fuzzy controller is proposed, which ensures that the fuzzy controller can utilize the entire rule base by auto-tuning algorithm. Computer simulation and experimental results on a 5 hp induction machine are presented to substantiate the proposed scheme.
为了提高感应电机驱动系统的性能,提出、开发并实现了一种带有动态集中学习算法的模糊逻辑控制器(FLC)。在标准的直接模糊控制器中,规则库的利用率大多较差,特别是当误差输入较小,控制动作仅由规则库中心的少数规则产生时。由于规则数量如此之少,模糊控制器的性能不充分,因为得到的控制面可以捕获非常近似的控制动作。这种对规则库的不良利用可能会降低控制器的性能。这个问题的一个可能的解决方案可能是重新设计规则库,使规则库的中心有更多的规则。然而,这种解决方案限制了控制器对有限输入范围和特定输入的能力。提出了一种DFL模糊控制器,通过自整定算法保证模糊控制器能够充分利用整个规则库。最后给出了5马力感应电机的计算机仿真和实验结果。
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引用次数: 0
Implementation of roll motion in magnetic suspension wind tunnel 磁悬浮风洞中横摇运动的实现
C.E. Lin, Ming Huang
Wind tunnel tests are generally obstructed by model support with limitations. The development of magnetic suspension wind tunnel (MSWT) is designed to free the model from conventional mechanical supports. Under precise model design, a roll motion with appropriate control can be implemented in MSWT. This paper presents a modification of NCKU 10 cm/spl times/10 cm MSWT to accomplish the roll motion control in wind tunnel tests. The modification of this experiment includes position and attitude sensing and test model design. The position and attitude sensing is improved and set-up by a laser-optical circuit, quadrant detectors and dual-lateral detector in x-axis to ensure accurate measure. The rolling inertia is generated from a rotating mass inside the test model. With very careful design, a rocket model is fabricated for experiments. A passive PID control is implemented to achieve the predictable constant roll motion on the test model. A current feedback loop is applied to strengthen the control stability. Being different from other MSWT applications, the test model is locked by the position and attitude sensing via feedback control loop. Due to the accomplishment of motion test roll only constant speed in good control limitations, demonstrates performance. The idea of this study is to extend dynamic test capability in the magnetic suspension wind tunnel, and bring further valuable applications.
风洞试验通常受到有限制的模型支撑的阻碍。磁悬浮风洞(MSWT)的开发旨在将模型从传统的机械支撑中解放出来。在精确的模型设计下,可以在MSWT中实现适当控制的滚动运动。为了实现风洞试验中的横摇运动控制,对NCKU进行了10 cm/spl次/10 cm MSWT的改进。本实验的修改包括位置姿态感知和试验模型设计。采用激光光学电路、象限检测器和x轴双侧检测器对位置和姿态传感进行了改进和设置,保证了测量的准确性。滚动惯量是由试验模型内部的旋转质量产生的。经过精心设计,制作了一个火箭模型用于实验。采用无源PID控制,实现对试验模型的可预测的恒横摇运动。采用电流反馈回路加强控制的稳定性。与其他MSWT应用不同的是,测试模型是通过反馈控制环进行位置和姿态感知锁定的。由于在运动试验中只能完成恒速滚转的良好控制限制,论证了其性能。本研究的目的是拓展磁悬浮风洞的动态测试能力,并带来更多有价值的应用。
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引用次数: 1
BACIS-binaural audio communications and intercom system bacis -双耳音频通信和对讲系统
G. Valentino, P. Rudolph, P. Datta, M. Stuart
A multimode, digital intercom and communications system has been developed and demonstrated. One of the features of this system is the ability to spatialize the audio sources, so that the human users of the system will have improved situational awareness. This paper describes the architecture and selected details of the system and its application in an airborne command post.
开发并演示了一个多模、数字对讲和通信系统。该系统的特点之一是能够对音频源进行空间化处理,从而提高系统用户的态势感知能力。本文介绍了该系统的结构、选型及在某空中指挥所的应用。
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引用次数: 2
Ultrafast invariant face recognition 超快速不变人脸识别
M. Alam, A. Al-Samman
In this paper, we investigate human face recognition for facial images involving a high degree of in-plane and out-of-plane 3D distortions such as rotation. In the proposed technique, we investigated the problem of invariant face recognition by considering four different classes of images. A small subset of images is used for every class to create a composite image, which represents each class. The proposed technique is implemented by using fringe-adjusted filter based joint transform correlator (JTC) technique due to its superior performance over alternate JTCs and the feasibility of its implementation in the optical domain. Furthermore, the utilization of synthetic discriminant function to generate the composite image for enhancing the correlation output is also investigated. Computer simulation results are presented to show the validity of the proposed technique.
在本文中,我们研究了人脸识别涉及高度平面内和平面外的三维扭曲,如旋转的人脸图像。在提出的技术中,我们通过考虑四种不同类别的图像来研究不变人脸识别问题。每个类使用一小部分图像来创建代表每个类的合成图像。该技术采用基于条纹调整滤波器的联合变换相关器(JTC)技术实现,其性能优于其他联合变换相关器技术,且在光学领域具有可行性。此外,还研究了利用综合判别函数生成复合图像来增强相关输出。计算机仿真结果表明了该方法的有效性。
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引用次数: 5
The power supply system of the particle tracker detector for the AMS experiment AMS实验中粒子跟踪探测器的供电系统
M. Menicheilil, A. Bánfalvi, R. Battiston, S. Blasko, A. Papi, G. Scolieri
The AMS (Alpha Magnetic Spectrometer) experiment is designed to search for the antimatter components of cosmic rays, the products of the annihilation of dark matter particles and to perform additional cosmic-ray measurements like spectrum of light nuclei, antiprotons and positrons as well as isotopic composition for light elements. The complete AMS instrument will be installed on the International Space Station (ISS) in year 2003. A preliminary version of the apparatus has flown in June 1998 on the Space Shuttle mission STS-91. The power supply system of the tracker, described in this paper, has been constructed optimizing noise performances, following space qualification criteria for a ten day mission on the shuttle and considering the operation in the fringe magnetic field of the spectrometer. This paper also includes a short description of tracker electronics. Optimisation and qualification tests on the complete power supply system are reported. Even if most of the paper refers to the Shuttle flight version of the paper supply, guidelines for the design of the ISS flight version are given in the conclusions.
AMS(阿尔法磁谱仪)实验旨在寻找宇宙射线的反物质成分,即暗物质粒子湮灭的产物,并进行额外的宇宙射线测量,如光核、反质子和正电子的光谱,以及轻元素的同位素组成。完整的AMS仪器将于2003年安装在国际空间站上。该设备的初步版本已于1998年6月在航天飞机STS-91任务上飞行。本文所描述的跟踪器供电系统,根据航天飞机10天任务的空间定性标准,并考虑到谱仪条纹磁场下的工作,对噪声性能进行了优化。本文还简要介绍了跟踪电子器件。对整个供电系统进行了优化和鉴定试验。即使大部分论文是指航天飞机飞行版本的论文供应,国际空间站飞行版本的设计指导方针是在结论中给出的。
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引用次数: 0
期刊
Proceedings of the IEEE 2000 National Aerospace and Electronics Conference. NAECON 2000. Engineering Tomorrow (Cat. No.00CH37093)
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