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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date March 1983

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Displaying Results 1 - 25 of 32
  • Table of contents

    Publication Year: 1983, Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1983, Page(s): c2
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  • From the Editors

    Publication Year: 1983, Page(s): 161
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  • Carrier-Tracking Loop Performance for Quaternary and Binary PSK Signals

    Publication Year: 1983, Page(s):162 - 167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1580 KB)

    By expressing the open-loop response voltage as a Fourier series in terms of the phase-tracking error and then utilizing a very useful mean-value expression, we assess the performance of loops suited to recovering the carrier of four-phase (quaternary) and two-phase (binary) phase-shift-keyed (QPSK and BPSK) signals. At high signal to noise ratios (SNRs) they perform comparably, but at low SNRs th... View full abstract»

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  • Performance of Digital Implementations of an Adaptive Processor

    Publication Year: 1983, Page(s):168 - 173
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1571 KB)

    The performance of a digital implementation of an Applebaum-Howells type adaptive processor is analyzed for both a limiter and nonlimiter configuration. The performance is evaluated in terms of steady-state residue power, using either a single-pole filter or a perfect integrator to smooth the output of the correlation mixer. The latter filter is the more commonly used for digital implementations. ... View full abstract»

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  • Test Results with an Experimental Direction-Finding System

    Publication Year: 1983, Page(s):174 - 181
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1651 KB)

    A direction-finding system was built that can simultaneously estimate the arrival angles of two incident signals. It is conceptually straightforward to extend the system to cases with greater numbers of signals. The system is designed to work with uncorrelated signals whose form is unknown, e.g., two communications signals residing in the same bandwidth. Pulsed as well as continuous signals can be... View full abstract»

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  • Stability of Gyro with Harmonic Nonlinearity in Spinning Vehicle

    Publication Year: 1983, Page(s):182 - 189
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1744 KB)

    A stability analysis of a single-axis rate gyroscope mounted in a space vehicle which is spinning with uncertain angular velocity ¿z about the spin axis of the gyro is presented. The complete nonlinear equation of motion, which includes the fundamental and second harmonic nonlinear terms, arising due to ¿z, is considered. For time-varying ¿z(t), using the circle criterion, it is shown that the ... View full abstract»

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  • Improved Switching Converter Model Using Discrete and Averaging Techniques

    Publication Year: 1983, Page(s):190 - 202
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2756 KB)

    The nonlinear modeling and analysis of dc-dc converters has been done by averaging and discrete-sampling techniques. The averaging technique is simple, but inaccurate, as the modulation frequencies approach the theoretical limit of one-half the switching frequency. The discrete technique is accurate even at high frequencies, but is very complex and cumbersome. An improved model is developed by com... View full abstract»

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  • Optimization of the Energy-Storage Inductors for DC-to-DC Converters

    Publication Year: 1983, Page(s):203 - 214
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2386 KB)

    Three sets of design graphs and equations are developed to facilitate design of the energy-storage inductors for dc-to-dc converters. Using the design graphs, a quick estimate of the inductor minimum weight, the transistor peak current, and the inductor power loss can be obtained. Tradeoff studies can be conveniently conducted using these graphs. The effects of duty cycle controllers, constant fre... View full abstract»

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  • Rotation and Shape of High Altitude Reflectors Controlled from the Ground

    Publication Year: 1983, Page(s):215 - 220
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1526 KB)

    Passive, inverted-dish shaped communications mirrors made of a thin wire mesh may be maintained in a stationary position above most of the atmosphere by the pressure of reflected radiation beamed at the mirror from the ground. We show that by beaming at the mirror an appropriate mixture of linearly and circularly polarized radiation, and by inducing small periodic variations of the plane of polari... View full abstract»

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  • Adaptive Control of a Current-Fed Induction Motor

    Publication Year: 1983, Page(s):221 - 231
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1639 KB)

    An adaptive nonlinear control system is presented for a currentsource inverter-fed induction motor. The approach to the control problem is fundamentally different to previous work in that it uses the steady-state model to formulate a nonlinear control which directly controls the shaft speed. The controller is adaptive, so neither load nor machine parameters need to be specified, although in practi... View full abstract»

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  • Control of Stochastic Systems with Markov Interrupted Observations

    Publication Year: 1983, Page(s):232 - 239
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1629 KB)

    Linear discrete-time stochastic systems with abruptly changing parameters in the measurement mechanism are considered. The abrupt changes are modeled by a finite-state Markov chain. The multiple model partitioning approach is used to derive suboptimal control algorithms as the optimal solution is intractable. The proposed approach is illustrated by simulation examples. View full abstract»

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  • Stability of the Decentralized Estimation in the JTIDS Relative Navigation

    Publication Year: 1983, Page(s):240 - 249
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2277 KB)

    The joint tactical information distribution system (JTIDS) includes a relative navigation capability with which each member can estimate its own position by utilizing the broadcast position estimates of other members plus the measured times of arrival of the radio signals. Previous simulation studies of the system have shown that unrestricted ranging between members can produce unstable navigation... View full abstract»

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  • Polarization Detection of a Fluctuating Radar Target

    Publication Year: 1983, Page(s):250 - 257
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2267 KB)

    A mathematical framework is developed which allows a polarization description of a received radar signal for the purpose of target-clutter discrimination. Statistical models that include all changes in the polarization of an incident radar signal upon reflection are also developed for both targets and clutter. Using these models, a detector that thresholds various functions of the polarization-rel... View full abstract»

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  • A Novel Feedforward Compensation Canceling Input Filter-Regulator I nteraction

    Publication Year: 1983, Page(s):258 - 268
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2079 KB)

    The interaction between the input filter and the control loop of switching regulators often results in detrimental effects, such as loop instability, degradation of transient response, and audiosusceptibility, etc. The concept of pole-zero cancellation is employed to mitigate some of these detrimental effects and is implemented using a novel feedforward loop, in addition to existing feedback loops... View full abstract»

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  • Observability, Eigenvalues, and Kalman Filtering

    Publication Year: 1983, Page(s):269 - 273
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1373 KB)

    In higher order Kalman filtering applications the analyst often has very little insight into the nature of the observability of the system. For example, there are situations where the filter may be estimating certain linear combinations of state variables quite well, but this is not apparent from a glance at the error covariance matrix. It is shown here that the eigenvalues and eigenvectors of the... View full abstract»

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  • Investigations of Stability & Dynamic Performances of a Current-Injected Regulator

    Publication Year: 1983, Page(s):274 - 287
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3452 KB)

    The stability and dynamic performances of a buck/boost regulator employing a current-injected control are examined. Small-signal models for the power state, the multiloop error processor, and the duty-cycle pulse modulator are developed. The error-processor model which incorporates the current-injected loop, the dc loop, and the compensation network permits evaluation of the effects of each indivi... View full abstract»

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  • Detectors for Multiomial Input

    Publication Year: 1983, Page(s):288 - 297
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2039 KB)

    The binary detection problem is considered. Under an arbitrary noise environment, the input sample space can be transformed into a multinomial vector. Based on observations of this vector, the Neyman-Pearson optimal detector is developed for a known signal. When the signal strength is unknown, the likelihood ratio principle is followed to obtain consistent tests which use the Pearson's chisquare s... View full abstract»

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  • Asynchronous Performance of Slitted Rotor Reluctance Machines - Effects of Copper Conductors

    Publication Year: 1983, Page(s):298 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2455 KB)

    A detailed study of the asynchronous performance of slitted solid-rotor reluctance machines is presented when axial copper conductors are provided in the slits or slots, or both. Further, the influence of end terminations with and without conducting end rings on the asynchronous performance of the motor is also discussed. Theoretical investigations are based on three equivalent circuits presented ... View full abstract»

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  • Information for authors

    Publication Year: 1983, Page(s): 312
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  • Data-Adaptive Detection of a Weak Signal

    Publication Year: 1983, Page(s):313 - 316
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Motivated by a form of the likelihood-ratio-tesf statistic for detection of a rank-one Gaussian signal in colored Gaussian noise, we apply our earlier technique for estimation of a low-rank signal to the problem of estimating and subtracting the waveform of a strong sinusoidal interference prior to detection of a weak sinusoidal signal. We consider the difficult case in which samples of data are t... View full abstract»

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  • Comments on a Review of "A Necessary and Sufficient Condition for GYROLITE Stability"

    Publication Year: 1983, Page(s):316 - 317
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  • Rectangular-Wave Modulation

    Publication Year: 1983, Page(s):317 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1266 KB)

    Rectangular-wave modulated pulse lengths are expressed as a function of the modulation index. The theoretical expressions are experimentally verified. An experimental measurement of signal-to-noise ratio for rectangular-wave modulation confirms the theoretical analysis. Jelonek's signal-to-noise ratio formula for pulse-length modulation is also found applicable to rectangular-wave modulation. It i... View full abstract»

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  • Exact Detection Performance for Broadband Correlators

    Publication Year: 1983, Page(s):320 - 322
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (395 KB)

    The detection of a broadband plane wave in an isotropic noise field is considered. The detection statistic used is the cross correlation of the sampled output from two sensors where the sampling rate equals the Nyquist rate and the time delay is an integer multiple of the sampling period. By restricting the number of points in the cross correlation to be even, the detection and false-alarm probbil... View full abstract»

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  • Correlation of Binarized Images

    Publication Year: 1983, Page(s):322 - 328
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2970 KB)

    Correlator technique has been used in pattern recognition applications. We introduce a correlation performance measure, peak to background ratio (PBR), defined as the ratio of the peak intensity to the average background variation in a single correlation output. Using this performance measure, we analyze the binary correlator and show that the binarization of the images can result in better perfor... 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. 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory