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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date March 1978

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Displaying Results 1 - 25 of 37
  • Table of contents

    Publication Year: 1978, Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1978, Page(s):c2 - 416a
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  • From the Editors

    Publication Year: 1978, Page(s): 225
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  • The Measurement of Echo Direction in a Phased-Array Radar

    Publication Year: 1978, Page(s):226 - 236
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1579 KB)

    For a planar-array antenna with a monopulse feed horn, this study describes a simple algorithm for the determination of the direction of target echoes. Antenna pattern measurements of the array indicate that the direction sines of a received wavefront can be independently obtained with one simple relation between a normalized difference channel output and a direction sine. This paper determines th... View full abstract»

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  • Performance Evaluation of Energy Detectors

    Publication Year: 1978, Page(s):237 - 241
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1063 KB)

    The prediction of energy detector performance requires a complicated calculation or a tedious manipulation of nomograms. For a large time-bandwidth product WT, however, it is commonplace to use the formula (E/No) = d¿WT to anticipate the required average input energy-to-noise spectral density ratio for a wanted signal detectability parameter d and thus avoid the computational difficulty. This pap... View full abstract»

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  • Modified Savage and Modified Rank Squared Nonparametric Detectors

    Publication Year: 1978, Page(s):242 - 250
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1942 KB)

    A modified form of the basic Savage statistic is considered and the performance of a modified Savage (MS) nonparametric detector using this modified statistic is derived. Also, a detector using a modified rank squared statistic (MRS) is introduced. The asymptotic relative efficiency (ARE) of the detectors is determined for chisquare, Rician, and log-normal signal fluctuations when the background n... View full abstract»

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  • Feedback Transmission of Binary Data with Automaton Receiver

    Publication Year: 1978, Page(s):251 - 257
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1931 KB)

    Feedback transmission of binary data over a discrete-time additive Gaussian white noise channel is considered. The effect of some specific finite memory structure at the receiver is investigated. The whole communication scheme is the discrete analog of the one previously analyzed by Khas'minskii. The resulting average transmission time is increased by only about 20 percent of the theoretical limit... View full abstract»

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  • On Attitude Estimation Schemes for Fine-Pointing Control

    Publication Year: 1978, Page(s):258 - 265
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1638 KB)

    This paper studies single-axis equations of motion that are applicable to a spacecraft or to a space experiment pointing assembly whose motion has been perfectly isolated from the carrier vehicle. It considers four state estimators for implementation in the control loop for a stellar observation experiment. The first three estimators are very general and do not make use of input torque in their pr... View full abstract»

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  • Area Target Response of Triangularly Frequency-Modulated Continuous-Wave Radars

    Publication Year: 1978, Page(s):266 - 277
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2721 KB)

    For a postulated model of the area target returns, the variance of the signal appearing at the detector output of a frequency-modulated continuous-wave radar is analytically and graphically displayed as a function of the range and Doppler spread. The influence of important system parameters like modulation frequency, measuring time, and frequency excursion are also included in the analysis. Closed... View full abstract»

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  • Adjacent Channel Interference in a Binary Bandpass Communication System

    Publication Year: 1978, Page(s):278 - 283
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1260 KB)

    The effect of adjacent channel interference on the probability of error in a binary bandpass communication system with an integrating and dumping detector is investigated. Narrowband filters are assumed in the receiver of the main signal and transmitters of both main and interfering signals. Plots of the probability of error as a function of signal to noise ratio in the main channel or as a functi... View full abstract»

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  • Bounds on the Probability of Error in Digitial Communications

    Publication Year: 1978, Page(s):284 - 291
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1641 KB)

    A class of upper bounds and lower bounds on the probability of error in digital communications are derived. Several degrading factors like intersymbol interference, cochannel interference, inaccurate carrier synchronization, and incoherent detection can be considered in obtaining the bounds. Several examples are given and it is shown that many situations not considered so far can be put into the c... View full abstract»

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  • Sensitivity Reduction in Aircraft Control Systems

    Publication Year: 1978, Page(s):292 - 297
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    A method for reducing trajectory sensitivity to parameter perturbations for linear feedback systems is described. Application of the method to the design of aircraft control systems, with special reference to a helicopter forward flight control system, is illustrated. The response of the system based on this method is found to be better than that obtained with fixed-feedback gain controllers, alth... View full abstract»

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  • Sensitivity Considerations in Trajectory Optimization

    Publication Year: 1978, Page(s):298 - 304
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1366 KB)

    A technique by which the trajectory optimization problem can be formulated to include the trajectory sensitivity functions in the performance index is presented. It is shown that an explicit steering law, which can be derived for the upper atmospheric flight of a vehicle, is a function of the sensitivity state, adjoint vectors, and the parameters of the chosen trajectory dynamics. The new steering... View full abstract»

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  • An Upper Bound on Detection Probability for Fluctuating Signals

    Publication Year: 1978, Page(s):305 - 311
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2938 KB)

    In the theory of signal detectability, the signal-to-noise ratio (SNR), defined as the quotient of the average received signal energy and the spectral density of the white Gaussian noise, is a fundamental parameter. For a signal which is exactly known, or known except for a random phase, this ratio uniquely defines the detection performance which can be achieved with a matched filter receiver. How... View full abstract»

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  • A Technique for Measuring Fading Microwave Signals from the ATS-5 Spacecraft

    Publication Year: 1978, Page(s):312 - 318
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3045 KB)

    A description of a technique for measuring fading microwave signals from the NASA ATS-5 spacecraft is presented. A ground station was used to transmit to and receive from the ATS-5 via its L-band transponder. The experiment included an L-band transmitter, three independent L-band receiving systems, and a semiautomatic data acquisition and analysis system. Sample data are presented. View full abstract»

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  • Radio Interference in Helicopter-Borne Pulse Doppler Radars

    Publication Year: 1978, Page(s):319 - 328
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1589 KB)

    Radio interference generated in a helicopter-borne pulse Doppler radar system due to rotating blades is analyzed for the case that blades are located in the far field region of the radar antenna. A first-order estimate of the blade interference power spectrum is obtained as a function of antenna depression angle and radar (helicopter) altitude and speed. Numerical calculations show that blade inte... View full abstract»

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  • Pull-In Time and Range of Any Order Generalized PLL

    Publication Year: 1978, Page(s):329 - 333
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1155 KB)

    The general pull-in range and pull-in time expressions are derived versus the relevant system parameters and the initial detuning for any order loop with any type of phase detector by the quasistationary approach. Even though the pull-in time expression becomes more accurate as the loop's order becomes larger, it is correct also for second-and third-order loops provided that the initial detuning, ... View full abstract»

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  • Some Effects of Phased-Array Dispersion on Digital Error Rates

    Publication Year: 1978, Page(s):334 - 342
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1815 KB)

    Some calculations of the effect of phased-array dispersion on degrading phase-shift-keyed (PSK) error rates are presented. The results are given in the form of curves of the bit error rate versus the ratio of array "fill-time" (propagation time across the array) to signaling interval. Values of this ratio in the range 0.5 to 0.8 are required to degrade the error rate by a factor of 2. These result... View full abstract»

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  • Digital and Analog Subcomplementary Sequences for Pulse Compression

    Publication Year: 1978, Page(s):343 - 350
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1788 KB)

    Golay's complementary pairing has been a method to increase the utility of binary sequences, because of the temporal sidelobe suppression in the autocorrelation vector summation. Complementary sets of Tseng and Liu and of Hollis exhibit the same effect when several autocorrelations are combined. These complementary pairs and sets of sequences can be extended into long complementary chains by a sim... View full abstract»

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  • Minimal-Order Models for False-Alarm Calculations on Sliding Windows

    Publication Year: 1978, Page(s):351 - 363
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1925 KB)

    A procedure is developed to obtain practical numerical results in connection with the m-out-of-n sliding-window detection problem. This effort was motivated by difficulties with previous approaches involving approximation, Markov models, and Monte Carlo simulation. Generating-function methods were found to be unsatisfactory for window lengths greater than 6 due to their complexity. Instead, a Mark... View full abstract»

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  • ATS-6 Parabolic Antenna for Mounting Solar Cells

    Publication Year: 1978, Page(s):364 - 367
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (797 KB)

    Calculations are made to obtain the raw electrical power that can be generated by using an ATS-6 type deployable parabolic dish as a surface for mounting solar cells without seriously interfering with its normal function as an antenna. A minimum of a few hundred watts to a maximum of a few kilowatts are generated during the apparent course of the Sun around the spacecraft. Academically, it seems t... View full abstract»

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  • Suboptimal Control of Satellite Momenta in a Noisy Environment

    Publication Year: 1978, Page(s):368 - 371
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (878 KB)

    The body rate dynamics of a spin-stabilized satellite are perturbed by white noise. We consider the optimal control of body rates and fuel consumption. The corresponding deterministic problem is solved using calculus of variation. The stochastic problem is then solved to obtain a suboptimal controller in closed form. View full abstract»

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  • Comments on "on Probability of Error in Decision Feedback Equalizer"

    Publication Year: 1978, Page(s):373 - 375
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (346 KB)

    The above-mentioned paper [1] derives bounds on the error probability of a decision feedback equalizer (DFE) which are claimed to be significantly tighter than the earlier upper bound of [2]. Unfortunately, [1] makes an unsupportable assumption which reddars the conclusions incorrect. We show that valid bounds can be obtained by the methods of [1], but that for the numerical example of [2] , the r... View full abstract»

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  • The Geometry of Escaping Targets

    Publication Year: 1978, Page(s):375 - 379
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (681 KB)

    The escape regions for alerted targets are analytically defined.Sets of circles which circumscribe these regions provide simplified meas of the resulting escape involutes and yield important weapon guidance and sensor search parameters. These regions permit the selection of an aimpoint which incorporates the potential of target maneuers. Applications that illustrate the improved performance of the... View full abstract»

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  • Artificial Noise in Adaptive Arrays

    Publication Year: 1978, Page(s):380 - 384
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (782 KB)

    "Artificial noise," or the connection of feedback paths around the the integrators, is shown to be an effective method of dealing with the problem of multiplier offsets in adaptive antennas. This probl which was analyzed by Compton [1] is particularly troubles when the covariance matrix is singular or nearly so. Like added real noise, the artificial noise improves the condition number of the under... 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