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National Aerospace and Electronics Conference, 2000. NAECON 2000. Proceedings of the IEEE 2000

Date 12-12 Oct. 2000

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Displaying Results 1 - 25 of 112
  • National Aerospace and Electronics Conference NAECON 2000 [front matter]

    Publication Year: 2000 , Page(s): 0_1 - xi
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    Freely Available from IEEE
  • Primary Authors

    Publication Year: 2000 , Page(s): 814 - 816
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    Freely Available from IEEE
  • Model-based RF ground moving target signature synthesis and analysis tool

    Publication Year: 2000 , Page(s): 158 - 163
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    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 View full abstract»

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  • The α-β-η-&thetas; tracker with a random acceleration process noise

    Publication Year: 2000 , Page(s): 165 - 171
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    Time has proven that α-β filters provide a good and useful tracking methodology when used with sensors that measure position only. As new sensors are being integrated into platforms that measure position and Doppler velocity, a new tracker is required to properly process both position and velocity sensor measurements. This article introduces an α-β-η-θ filter, which processes both position and velocity sensor measurements. This new filter optimally tracks objects having a random acceleration maneuver model while being updated from a sensor having position and velocity measurement estimates View full abstract»

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  • A variable structure control system for the propulsion controlled automatic landing of a contemporary large transport aircraft

    Publication Year: 2000 , Page(s): 187 - 194
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    Propulsion Controlled Aircraft (PCA) techniques address the problem of controlling an aircraft through only the propulsion system after the primary flight control system has failed. There have been several major commercial accidents in which over 1200 people have lost their lives due to these type of accidents. In addition during the Vietnam War it is estimated that 18% of the aircraft lost…around 1800 aircraft…were lost due to flight control system failures. PCA techniques have been shown to have the potential to prevent some of these commercial aircraft accidents and have also been shown to have the potential to significantly improve military aircraft survivability to flight control system damage or failures. This paper will present a brief history of accidents that might have been avoided through PCA techniques and will apply the modern nonlinear Variable Structure Control System (VSCS) method to the aircraft PCA problem for a contemporary large transport aircraft. The VSCS controller will be compared with a classical linear controller for the task of glide slope tracking. The robustness of the VSCS controller to sensor noise and model uncertainty will be evaluated. It will be shown that the VSCS controller performs as well as the classical controller with improved robustness to model uncertainty View full abstract»

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  • Achieving higher levels of electronic integration through system-on-chip

    Publication Year: 2000 , Page(s): 451 - 458
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    All aerospace vehicles have the common constraint of limited space for the electronic systems. The challenge has always been how to pack effective electronic systems into the space available. Higher levels of electronic integration can give a competitive advantage, for example by providing extra channels in a communications satellite thereby increasing revenue to the operator. Today's deep sub-micron manufacturing processes for integrated electronics offer an opportunity for a step change for electronic functionality that can packaged in a given space. This technology makes possible, for the first time, a true System-on-Chip approach to electronic systems, which is already being exploited by the commercial sector in products such as the mobile telephone View full abstract»

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  • An evaluation framework for power electronic device models using decision making under uncertainties

    Publication Year: 2000 , Page(s): 541 - 546
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    The uncertainty in modeling and simulation in power device comes from many different sources. This uncertainty brings a question of how to choose the best-fit model for a specific purpose and environment of a circuit designer. This paper proposes a numerical framework of decision making under incomplete knowledge, which quantifies the uncertainty of models and allows circuit designers to know the realistic expectations of the performance and, thus provides the level of appropriateness of the models. Case studies are performed for practical applications of the framework View full abstract»

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  • The research and development of a full color digital image photofinishing system

    Publication Year: 2000 , Page(s): 196 - 200
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    A new apparatus has been recently developed in the Institute of RS and GIS of PKU. The apparatus is a digital photofinishing system that employs an OE (Optical Engine) for light source and a LCD (liquid crystal display) panel for digital imaging. This system applies digital imaging technologies in the conventional silver halide imaging chain. Traditional photofinishing has been enhanced by delivering new products to the consumer and by delivering existing services and products at higher quality and less cost. In the system, the newly released product of LCD is used to write digital images onto conventional AgX color negative paper, and the technologies, equipment, and software, highly leveraged from the imaging PC, are used. With an emphasis on the unique features, the advancement beyond the current capabilities of traditional AgX imaging in the photofinishing is represented View full abstract»

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  • How to predict software defect density during proposal phase

    Publication Year: 2000 , Page(s): 71 - 76
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    The author has developed a method to predict defect density based on empirical data. The author has evaluated the software development practices of 45 software organizations. Of those, 17 had complete actual observed defect density to correspond to the observed development practices. The author presents the correlation between these practices and defect density in this paper. This correlation can and is used to: (a) predict defect density as early as the proposal phase, (b) evaluate proposals from subcontractors, (c) perform tradeoffs so as to minimize software defect density. It is found that as practices improve, defect density decreases. Contrary to what many software engineers claim, the average probability of a late delivery is less on average for organizations with better practices. Furthermore, the margin of error in the event that a schedule is missed was smaller on average for organizations with better practices. It is also interesting that the average number of corrective action releases required is also smaller for the organizations with the best practices. This means less downtime for customers. It is not surprising that the average SEI CMM level is higher for the organizations with the better practices View full abstract»

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  • A subspace-based online calibration algorithm for an asynchronous CDMA-based antenna array

    Publication Year: 2000 , Page(s): 146 - 150
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    In this paper a new iterative calibration algorithm for an asynchronous CDMA-based antenna array in the presence of unknown gain and phase errors is presented. The algorithm is applicable to a nonuniform array where the number of users could be greater than the number of antennas, and does not require a prior knowledge of the DOAs of the signals of any user. The method requires the code sequence of a reference user only. The proposed algorithm provides us with the joint estimates of the DOAs and the multi-path impulse response of the used signal sources as well as the calibration of the sensor gains and phases, even under multiple access interference. The algorithm is near-far resistant and thus well suited for multi-path fading channel View full abstract»

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  • Design of a reconfigurable automated landing system for VTOL unmanned air vehicles

    Publication Year: 2000 , Page(s): 801 - 806
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    With the release of Bombardier's redesigned vertical take-off and landing unmanned air vehicle (VTOL UAV), the company's development team was interested in exploring fresh avenues for automatically landing the craft. The focus of this redesign revolved around navigation via DGPS data. The development of three principle components were identified as being paramount to the success of the system. First was the need for an algorithm to locate an appropriate intercept point on the intended landing profile. Landing initiated the switch of navigation modes from one using GPS to one employing DGPS. This differing of sources and their respective accuracies led to position errors between expected and actual craft location, thereby necessitating the inclusion of the flight-path intercept algorithm. With the establishment of concrete target points, a corroborative effort was required between the second and third components of the autoland system to provide motion control between two arbitrary points in space. The first of the two, a trajectory generator, provides an ideal locus of points based on a time law, paying careful attention to the craft's acceleration. A controller using the ideal points generated by the trajectory generator drives the craft and was the second component of the motion control system. The controller configuration was kept simple, due in no small part to the project's scope. The initial evaluation tool for theory development was a simplified version of Bombardier's overall craft dynamics model for the CL-327. This was then followed by tests with a high-fidelity model. Currently, flight testing is in progress View full abstract»

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  • Classification of digital modulations using the LPC

    Publication Year: 2000 , Page(s): 774 - 778
    Cited by:  Papers (2)
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    We propose a new digital modulation classification method based on the continuous-time wavelet transformation (CWT) and the linear predictive coding (LPC) method. The LPC coefficients extracted from the LPC model of the CWT for a modulated signal is chosen as the feature used to classify the modulation types of BPSK, QPSK, FSK and jammer. By using several reference features per modulation type we can make our algorithm robust to the influence of noise. To verify the proposed modulation classification algorithm, simulations are performed, which demonstrate excellent classification rates View full abstract»

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  • The use of personal computer-based aviation training devices to teach aircrew decision making, teamwork, and resource management

    Publication Year: 2000 , Page(s): 421 - 426
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    The recent advent of the Personal Computer-Based Aviation Training Device (PC-ATD) allows flight education programs to provide low-cost realistic multi-crew simulated cockpit environment that can be used to teach the fundamentals of crew resource management (CRM) and decision making. PC-ATDs are personal computer-based flight simulation devices that can simulate several different single- and multi-engine two pilot aircraft. The flight simulation and the multi-crew arrangement allow an instructor to engage students in a variety of scenarios where they can directly apply the principles and theories of cockpit and crew resource management to realistic situations. In addition to procedural training, the PC-ATD allows an instructor to present various exercises to illustrate and reinforce CRM techniques in an airline and aircraft specific operational environment. In addition, instrument display and cockpit video recorders can be easily incorporated into the PC-ATD to allow an instructor and the flight crew to review the flight for further instruction and evaluation View full abstract»

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  • Use of TDM/PAMA satellite based communication as an option for the aeronautical communication

    Publication Year: 2000 , Page(s): 683 - 686
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    This paper deals with the multiple problems involved with the use of the VHF/ER in aeronautical communications, where multiple earth stations should operate simultaneously to communicate one ground based facility with a single airplane, and how a satellite communication operating TDM/PAMA may be the solution; in VHF/ER only one earth transmitter will effectively communicate with the airplane, the other stations will waste their time and energy View full abstract»

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  • Model based cost optimization for engineering and management

    Publication Year: 2000 , Page(s): 745 - 752
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    Long lasting systems like airplanes have a cost structure where the maintenance costs are larger than the purchasing costs. Besides, the growing amount of electronics leads to a much higher sensitivity with respects of failures in the electronic system. Testing is required, both for preventive maintenance as well as repair. Previously we have looked at the impact of test and design for testability on the cost structure. We have developed a complex cost model as well as a state of the art of cost modeling tool that allows the evaluation of the model. Finally, we show how cost modeling can effectively be integrated into the system design flow View full abstract»

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  • Identification friend-or-foe (IFF) sensor uncertainties, ambiguities, deception and their application to the multi-source fusion process

    Publication Year: 2000 , Page(s): 85 - 94
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    The importance of quantifying and modeling sensor uncertainties associated with kinematic, attribute, and hybrid sensors and their effect on the data fusion process (Bayesian, Dempster-Shafer, etc.) has not been well described. This paper explores some of the characteristics and uncertainties associated with MK XII Identification Friend-or-Foe (IFF) including its limitations, inherent error sources, and robustness to jamming and interference. A general multi-source sensor fusion process is described using Non-Cooperative Target Recognition, electronic support measures and IFF dissimilar source inputs with specific attention placed on realizable IFF sensor systems and how they need to be characterized in order to understand and design an optimized and effective multi-source fusion process View full abstract»

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  • A new sliding mode flux and speed observer for speed sensorless control of induction machine

    Publication Year: 2000 , Page(s): 574 - 578
    Cited by:  Papers (1)
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    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 View full abstract»

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  • Continuous time recurrent neural networks: a paradigm for evolvable analog controller circuits

    Publication Year: 2000 , Page(s): 299 - 304
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    This paper argues that Continuous Time Recurrent Neural Networks (CTRNNs) provide a particularly attractive paradigm under which to evolve analog electrical circuits for use as device controllers. It will make these arguments both by appeal to existing literature and by the example of a successful project in the control of an autonomous robot. The paper will conclude with a discussion of future work and goals View full abstract»

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  • Tuning of fuzzy logic controller using neural network

    Publication Year: 2000 , Page(s): 305 - 312
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    The transformation of expert's knowledge to control rules in a fuzzy logic controller has not been formalized and arbitrary choices concerning, for example, the shape of membership functions have to be made. The quality of a fuzzy controller can be drastically affected by the choice of membership functions. Thus, methods for tuning fuzzy logic controllers are needed. In this paper, neural networks and fuzzy logic are combined to solve the problem of tuning fuzzy logic controllers. The neuro-fuzzy controller uses the neural network learning techniques to tune the membership functions while keeping the semantics of the fuzzy logic controller intact. Both the architecture and the tuning algorithm are presented for a general neuro-fuzzy controller. From this, a procedure to tune a proportional fuzzy controller is obtained. The algorithm for off-line tuning of the fuzzy controller is demonstrated with a numerical example View full abstract»

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  • Design methods for system-on-a-chip control codecs to enhance performance and reuse

    Publication Year: 2000 , Page(s): 666 - 673
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    While the conventional concept of a signal coder-decoder (codec) is of a homogeneous device, such that the output decoding is simply an inverse of the input decoding, the heterogeneous codec developed in this paper decouples the input and output decoding; this variation generalizes the system. A control codec is an application of a heterogeneous codec, which replaces a traditional discrete analog control loop. This analog control loop includes an A/D (coder) plus a D/A (decoder), as well as other peripheral signal processing algorithms. Our application of the control codec is to improve the control of RF transponders in satellites. The codec is shown to have the ability to be optimized for a specific application as well as to be re-targeted to different fabrication lines. Because of the environmental demands on spaceborne devices several stable radiation-hardened SOI BiCMOS processes were used. The MIT Lincoln Labs AST Fully Depleted SOI deep-submicron process was also used as an example of re-targeting. Further, we develop the design for a control codec as an application of a general class of heterogeneous, process-independent codecs. The concepts for both a heterogeneous codec and a control codec are important additions to mixed-signal system design because they facilitate analog and mixed-signal block reuse. Our methodology implements a deliberate mixed-signal design decomposition, which enhances the reuse. This reuse is a major advancement in the development of evolvable hardware that uses both analog and digital signal processing in SoC applications View full abstract»

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  • A new method of resolving multiple targets of low resolution radar

    Publication Year: 2000 , Page(s): 710 - 715
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    In active low-resolution radar, longitudinal resolution usually is more than one hundred meters and as high as several hundreds meters. Due to the short distance between planes which fly in a group, ordinary low resolution radar cannot distinguish them in both distance and azimuth. If we use the technology of ISAR to resolve the difference among Doppler frequencies of the targets and obtain a fine resolution cross-cross image, we may separate them, but a long coherent processing time is needed. In this paper, we exploit the graphics sharpness rule to estimate the motion parameter for one dimensional cross-range images of low resolution radar and compensate them for translational motion. Since coherent processing must not be overlong, we adopt the method of super-resolution to improve the resolution. The experimental results of a group target show that the proposed approach is correct and effective View full abstract»

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  • Color pattern recognition using fringe-adjusted joint transform correlation

    Publication Year: 2000 , Page(s): 427 - 433
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    A fringe-adjusted joint-transform correlator (JTC) based technique for improved color pattern recognition is introduced. In the proposed technique, a real-valued filter, called the fringe-adjusted filter is used to reshape the joint power spectrum in order to yield better correlation output. A color image is processed through three channels, and the fringe-adjusted filtering is applied to each of these channels to obtain excellent correlation discrimination. The correlation outputs from these channels are then fused together to achieve a decision on the detection of a given color pattern. It is also shown that the fringe-adjusted filtering can be applied to a multichannel single-output JTC to obtain excellent correlation output that represents the coherence level between the input target image and the reference image for all color channels. These two techniques can be easily implemented in real time as for practical color pattern recognition applications. Two architectures for all-optical implementation of the proposed techniques are presented View full abstract»

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  • Water-arc device proposal

    Publication Year: 2000 , Page(s): 484 - 485
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    The water-arc reaction is a fairly new technology that converts electrical energy into mechanical energy using pure, distilled water as the transmission medium. To produce a reaction, a high-voltage power circuit is used to charge a pulse-discharge capacitor. A firing switch completes the circuit between the capacitor and the water-arc reaction chamber, causing a large current to surge through the water. The water apparently absorbs the energy previously stored in the capacitor, and releases it in the form of kinetic energy by rapidly ejecting out of the reaction chamber View full abstract»

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  • Adaptive transmission radar: the next “wave”?

    Publication Year: 2000 , Page(s): 779 - 786
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    Recent advances in linear amplifier and arbitrary waveform generation technology have spawned interest in adaptive transmitter systems as a means for both optimizing target signal gain and enhancing ID. In this paper, rigorous theoretical performance bounds are constructively established for the joint transmitter-target-channel-receiver optimization problem in the presence of additive colored noise (ACN), (e.g., interference multipath). For the ACN case, an analytical solution is obtained as an eigenvector (with associated maximum eigenvalue) of a homogeneous Fredholm integral equation of the second type. The kernel function is Hermitian and is obtained from the cascade of the target impulse response with the ACN whitening filter. The, theoretical performance gains achievable over conventional transmitter strategies (e.g., chirp) are presented for various simulation scenarios including interference multipath mitigation. Also discussed, is the potential effectiveness of an optimal discriminating pulse solution for the N-target ID problem that arises naturally from the theory View full abstract»

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  • BACIS-binaural audio communications and intercom system

    Publication Year: 2000 , Page(s): 766 - 773
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB)  

    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 View full abstract»

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