IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • July 2002

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Displaying Results 1 - 25 of 34
  • Brightness-independent start-up routine for star trackers

    Publication Year: 2002, Page(s):813 - 823
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (554 KB) | HTML iconHTML

    Initial attitude acquisition by a modern star tracker is investigated here. Criteria for efficient organization of the on-board database are discussed with reference to a brightness-independent initial acquisition algorithm. Star catalog generation preprocessing is described, with emphasis on the identification of minimum star brightness for detection by a sensor based on a charge coupled device (... View full abstract»

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  • Novel single-phase AC/DC converter with two PWM control schemes

    Publication Year: 2002, Page(s):1000 - 1010
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (653 KB) | HTML iconHTML

    A novel single-phase AC/DC converter with two pulsewidth modulation (PWM) schemes is proposed to draw a sinusoidal line current with nearly unity power factor, achieve balanced neutral point voltage and regulate the DC bus voltage. With the aid of neutral point clamped scheme, a three-level voltage pattern is generated on the AC side of the proposed rectifier. To track the tine current command der... View full abstract»

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  • Moving horizon Nash strategies for a military air operation

    Publication Year: 2002, Page(s):989 - 999
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (716 KB) | HTML iconHTML

    Dynamic game theory has recently received considerable attention as a possible technology for formulating control actions for decision makers in an extended complex enterprise that involves an adversary. Examples of such enterprises are very common in military operations. Enterprises of this type are typically modeled by a highly nonlinear discrete time dynamic system whose state is controlled by ... View full abstract»

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  • Micromachined gas flow regulator for ion propulsion systems

    Publication Year: 2002, Page(s):982 - 988
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (582 KB) | HTML iconHTML

    A gas flow regulator for ion propulsion systems on board small satellites is proposed. The device is fabricated by means of micromachining techniques and is made up of a silicon die and a borosilicate glass cover joined together by means of anodic bonding. The fabrication process of two different versions of the device is described. The gas mass flow dependence on both the inlet pressure and the a... View full abstract»

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  • Horizontal waypoint guidance design using optimal control

    Publication Year: 2002, Page(s):1116 - 1120
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB) | HTML iconHTML

    A horizontal waypoint guidance algorithm is proposed by applying line-following guidance to waypoint line segments in sequence. The line-following guidance is designed using an LQR (linear quadratic regulator). Then, the optimal waypoint changing points are derived by minimizing the accelerations required for changing the waypoint line segments. Also derived is a sufficient condition for the stabi... View full abstract»

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  • Feedforward maximum power point tracking of PV systems using fuzzy controller

    Publication Year: 2002, Page(s):969 - 981
    Cited by:  Papers (78)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (740 KB) | HTML iconHTML

    A feedforward maximum power (MP) point tracking scheme is developed for the interleaved dual boost (IDB) converter fed photovoltaic (PV) system using fuzzy controller. The tracking algorithm changes the duty ratio of the converter such that the solar cell array (SCA) voltage equals the voltage corresponding to the MP point at that solar insolation. This is done by the feedforward loop, which gener... View full abstract»

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  • Separation and tracking of multiple broadband sources with one electromagnetic vector sensor

    Publication Year: 2002, Page(s):1109 - 1116
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (506 KB) | HTML iconHTML

    A structure for adaptively separating, enhancing and tracking uncorrelated sources with an electromagnetic vector sensor (EMVS) is presented. The structure consists of a set of parallel spatial processors, one for each individual source. Two stages of processing are involved in each spatial processor. The first preprocessing stage rejects all other sources except the one of interest, while the sec... View full abstract»

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  • Quantitative speed control for SRM drive using fuzzy adapted inverse model

    Publication Year: 2002, Page(s):955 - 968
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (754 KB) | HTML iconHTML

    Quantitative and robust speed control for a switched reluctance motor (SRM) drive is considered to be rather difficult and challenging owing to its highly nonlinear dynamic behavior. A speed control scheme having two-degree-of-freedom (2DOF) structure is developed here to improve the speed dynamic response of an SRM drive. In the proposed control scheme, the feedback controller is quantitatively d... View full abstract»

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  • Passive tracking scheme for a single stationary observer

    Publication Year: 2002, Page(s):1046 - 1054
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (528 KB) | HTML iconHTML

    While there are many techniques for bearings-only tracking (BOT) in the ocean environment, they do not apply directly to the land situation. Generally, for tactical reasons, the land observer platform is stationary; but, it has two sensors, visible and infrared, for measuring bearings and a laser range finder (LRF) for measuring range. There is a requirement to develop a new BOT data fusion scheme... View full abstract»

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  • Multipath and ground clutter analysis for a UWB noise radar

    Publication Year: 2002, Page(s):838 - 853
    Cited by:  Papers (8)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (870 KB) | HTML iconHTML

    An ultrawideband (UWB) random-noise radar operating in the 1-2 GHz frequency band has been developed and field-tested up to a 200 m range at the Environmental Remote Sensing Laboratory (ERSL) of the University of Nebraska. A unique heterodyne correlation technique based on a delayed transmitted waveform using a photonic delay line has been used to inject coherence within this system. The performan... View full abstract»

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  • Small-signal modeling of variable-frequency pulsewidth modulators

    Publication Year: 2002, Page(s):1104 - 1108
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (392 KB) | HTML iconHTML

    Small-signal linear models are presented for variable-frequency constant on-time and variable-frequency constant off-time pulsewidth modulators. Both modulation methods are shown to have leading phase characteristics and nonlinear amplitude responses. The analytical results are validated by numerical simulation results and compared with previously published empirical models. The models are intende... View full abstract»

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  • Robust fuzzy controlled photovoltaic power inverter with Taguchi method

    Publication Year: 2002, Page(s):940 - 954
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (809 KB) | HTML iconHTML

    This paper presents design and implementation of a robust fuzzy controlled photovoltaic (PV) power inverter with Taguchi tuned scaling factors. To achieve fast transient response, small steady-state error and system robustness, a robust fuzzy controller is adopted, in which its input and output scaling factors are determined efficiently by using the Taguchi-tuning algorithm. The proposed system ca... View full abstract»

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  • Angular mean and variance for selected two-source radar-target combinations

    Publication Year: 2002, Page(s):1038 - 1046
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (579 KB) | HTML iconHTML

    Angle tracking of the desired target in the presence of interference is a common radar problem. It can occur when the desired target is competing with a jammer, clutter, or multipath. Angle statistics can vary significantly for a tracking radar depending upon the nature of this interference. The angular mean and variance are presented for three different statistical two-target types for single and... View full abstract»

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  • Update with out-of-sequence measurements in tracking: exact solution

    Publication Year: 2002, Page(s):769 - 777
    Cited by:  Papers (163)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (598 KB) | HTML iconHTML

    In target tracking systems measurements are typically collected in "scans" or "frames" and then they are transmitted to a processing center. In multisensor tracking systems that operate in a centralized manner, there are usually different time delays in transmitting the scans or frames from the various sensors to the center. This can lead to situations where measurements from the same target arriv... View full abstract»

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  • MATLAB code for plotting ambiguity functions

    Publication Year: 2002, Page(s):1064 - 1068
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (349 KB) | HTML iconHTML

    A MATLAB code capable of plotting ambiguity functions of many different radar signals is presented. The program makes use of MATLAB's sparse matrix operations, and avoids loops. The program could be useful as a pedagogical tool in radar courses teaching pulse compression. View full abstract»

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  • Full-polarization matched-illumination for target detection and identification

    Publication Year: 2002, Page(s):824 - 837
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (956 KB) | HTML iconHTML

    This paper investigates the optimization of the full-polarization radar transmission waveform and the receiver response to maximize either target detection or identification performance. Application of such full-polarization matched-illumination techniques to simulated VHF-band frequency response data of mobile surface targets yields a significant performance improvement over that corresponding to... View full abstract»

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  • Recursive state estimation for multiple switching models with unknown transition probabilities

    Publication Year: 2002, Page(s):1098 - 1104
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (451 KB) | HTML iconHTML

    This work considers hybrid systems with continuous-valued target states and discrete-valued regime variable. The changes (switches) of the regime variable are modeled by a finite state Markov chain with unknown and random transition probabilities following Dirichlet distributions. Our work analytically derives the marginal posterior distribution of the states and regime variables, the transition p... View full abstract»

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  • Medium PRF set selection using evolutionary algorithms

    Publication Year: 2002, Page(s):933 - 939
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB) | HTML iconHTML

    This paper presents a new and novel method of selecting multiple pulse repetition frequency (PRF) sets for use in medium PRF pulsed-Doppler radars. Evolutionary algorithms are used to minimise the blind areas in the range/Doppler space. The evolutionary algorithm allows optimal solutions to be generated quickly, far faster than with exhaustive searches, and is fully automatic, unlike existing tech... View full abstract»

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  • Sidelobe blanking with integration and target fluctuation

    Publication Year: 2002, Page(s):1023 - 1037
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (726 KB) | HTML iconHTML

    In radar systems, sidelobe blanking (SLB) is used to mitigate impulsive interference that enters the radar through sidelobes of the main antenna. SLB employs an auxiliary antenna channel with the output being compared with that of the main antenna channel and a decision is then made as to whether or not to blank the main channel output. SLB performance determination involves the evaluation of seve... View full abstract»

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  • Multiple model adaptive estimation with filter spawning

    Publication Year: 2002, Page(s):755 - 768
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (878 KB) | HTML iconHTML

    Multiple model adaptive estimation (MMAE) with filter spawning is used to detect and estimate partial actuator failures on the VISTA F-16. The truth model is a full six-degree-of-freedom simulation provided by Calspan and General Dynamics. The design models are chosen as 13-state linearized models, including first order actuator models. Actuator failures are incorporated into the truth model and d... View full abstract»

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  • Determination of required SNR values [radar detection]

    Publication Year: 2002, Page(s):1059 - 1064
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (383 KB) | HTML iconHTML

    The inverse signal-to-noise ratio (SNR) problem is defined as determining the average SNR X required to achieve a specified probability of detection Pd, given Pfa the false alarm probability, N the integration number, and K a target fluctuation parameter that encompasses the Swerling and Marcum models. Although exact expressions exist for the standard problem of determining P... View full abstract»

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  • DOA estimation using one-bit quantized measurements

    Publication Year: 2002, Page(s):868 - 884
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (951 KB) | HTML iconHTML

    The effects 1-bit quantization of the input samples has on the direction-of-arrival (DOA) estimation accuracy are considered. The signal model assumes a single stochastic Gaussian point source that is embedded in white Gaussian noise (WGN). The inherent limitations governed by the extreme clipping of the input data are analyzed using the Cramer-Rao bound (CRB) that is derived for a two-sensor arra... View full abstract»

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  • Gating techniques for maneuvering target tracking in clutter

    Publication Year: 2002, Page(s):1087 - 1097
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (611 KB) | HTML iconHTML

    Gating techniques for maneuvering target tracking using an IMM-PDA filter are considered in this paper. Existing gating techniques, namely, centralized gating and model based gating are reviewed and new gating techniques, called model probability weighted gating and two-stage model probability weighted gating, are proposed. A benchmark trajectory and a random scenario are considered for performanc... View full abstract»

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  • Robust wavelet neuro control for linear brushless motors

    Publication Year: 2002, Page(s):918 - 932
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (849 KB) | HTML iconHTML

    Design, simulation and experimental implementation of a wavelet basis function network learning controller for linear brushless dc motors (LBDCM) are considered. Stability robustness with position tracking is the primary concern. The proposed controller deals mainly with external disturbances, e.g. nonlinear friction force and payload variation in motion control of linear motors. It consists of tw... View full abstract»

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  • Incremental motion control of linear synchronous motor

    Publication Year: 2002, Page(s):1011 - 1022
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB) | HTML iconHTML

    In this study a particular incremental motion control problem, which is specified by the trapezoidal velocity profile using multisegment sliding mode control (MSSMC), is proposed to control a permanent magnet linear synchronous motor (PMLSM) servo drive system. First, the structure and operating principle of the PMLSM are described in detail. Second, a field-oriented control PMLSM servo drive is i... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control. 

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Meet Our Editors

Editor-in-Chief
Michael Rice
Brigham Young University