IEEE Transactions on Aerospace and Electronic Systems

Issue 1 • Jan. 1978

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Displaying Results 1 - 25 of 31
  • Table of contents

    Publication Year: 1978, Page(s): c1
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  • IEEE Aerospace and Electrronic Systems Society

    Publication Year: 1978, Page(s):c2 - 224a
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  • From the Editors

    Publication Year: 1978, Page(s): 1
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  • A State-Trajectory Control Law for DC-to-DC Converters

    Publication Year: 1978, Page(s):2 - 20
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3602 KB)

    Mathematical representations of a state-plane switching boundary employed in a state-trajectory control law for dc-to-dc converters are derived. Several levels of approximation to the switching boundary equations are presented, together with an evaluation of the effects of nonideal operating characteristics of converter power stage components on the shape and location of the boundary and the behav... View full abstract»

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  • On Computing the Cramer-Rao Bound for a Random Signal

    Publication Year: 1978, Page(s):21 - 26
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (913 KB)

    The Cramer-Rao bound for estimating parameters of a random signal is obtained using a sampled data approach. A numerical example is presented to illustrate the result. In two limiting cases, it is shown that this bound converges to the well-known bounds for the point and Rayleigh targets. View full abstract»

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  • Radar Cross Section of Ships

    Publication Year: 1978, Page(s):27 - 34
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3747 KB)

    A laboratory method to determine the magnitude and position of radar reflection sources on complex targets is described. In addition the method provides a way to measure the modification of the radar cross section (RCS) due to multipath. The method has application in modeling RCS for radar and electronic countermeasure (ECM) system performance analysis and in the study of the extent to which the s... View full abstract»

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  • Logarithmic Detection with Postdetection Filtering

    Publication Year: 1978, Page(s):35 - 43
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1316 KB)

    An analysis is presented of the performance of a logarithmic detector or followed by a low-pass filter, under the assumption of a large ratio of IF bandwidth to postdetection bandwidth. This allows for the probability of detection and similar quantities to be computed in a straightforward manner. The mean and variance of the filter output are found by first deriving the autocorrelation function of... View full abstract»

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  • Analysis of the Arithmetic Mean CFAR Normalizer for Fluctuating Targets

    Publication Year: 1978, Page(s):44 - 47
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1077 KB)

    The analysis of the arithmetic mean constant false-alarm rate (CFAR) normalizing processor for nonfluctuating targets entails consideration ion of the moderately complicated F-distribution. For Swerling 1 targets, the CFAR performance equations are quite simple. The mean signal-to-interference ratio (SIR), ϒ ─M, required as a function of probability of detection, PD, fal... View full abstract»

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  • Position Location: Triangulation Versus Circulation

    Publication Year: 1978, Page(s):48 - 53
    Cited by:  Papers (14)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1138 KB)

    Position location algorithms, using data from electronic surveillance systems have, for the most part, been based upon statistical analysis of the points of intersection of the lines of bearing. These triangulation ion algorithms may well minimize the effect of random measurement errors on the location estimate, but few existing algorithms account for systematic (bias) errors. An algorithm based u... View full abstract»

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  • Digital Controllers for VTOL Aircraft

    Publication Year: 1978, Page(s):54 - 63
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1723 KB)

    Using linear-optimal estimation and control techniques, digitaladaptive daptive control laws have been designed for a tandem-rocopteror heliopter which is equipped for fully automatic flight in terminal area operations. Two distinct discrete-time control laws are designed to interface with velocity-command and attitude-command guidance logic, and each incorporates proportional-integral compensatio... View full abstract»

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  • Error Measures for Normal Random Variables

    Publication Year: 1978, Page(s):64 - 68
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1047 KB)

    Four commonly used measures of error are the root mean square error (RMSE), the geometric mean error (GME), the mean radial error (MRE), and the circular or spherical error probable (CEP, SEP). Exact or approximate closed form expressions are given. for each for zero mean, normal random variables in two and three dimensions. Numerical comparison of the measures suggests the relationship GME *... View full abstract»

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  • Automatic Light Control Electro-Optical CCDTV Systems

    Publication Year: 1978, Page(s):69 - 75
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1241 KB)

    For electro-optical TV systems, a simplified method of analysis has been developed for an automatic light control (ALC) loop preliminary ary design and performance trade-offs. With iris and shutter control mechanization incorporated, not only does the input light range increase, but the video response overshoot and settling time are reduced as well. This study shows that the appealing notion of he... View full abstract»

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  • Principles and Simulation of JTIDS Relative Navigation

    Publication Year: 1978, Page(s):76 - 84
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2138 KB)

    The time-synchronous operation and high accuracy time-of arrival (TOA) measurement capability of Joint Tactical Information Distribution System (JTIDS) terminals makes possible a high performance relative nagivaton (RELNAV) function through addition of only software in the terminal's computer program. The principles of operation, the basic observation equations, and the system architecture for bot... View full abstract»

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  • Multipath Limitations on Low-Angle Radar Tracking

    Publication Year: 1978, Page(s):85 - 102
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3319 KB)

    This paper investigates the problem of tracking targets at a low elevation angle in the presence of specular and diffuse multipath. Quantitative estimates are derived of the elevation angles, and hence, range, at which targets of specified height can be accurately tracked. A parametric approach is followed in which the long-standing uncertainty of how terrain forward-scatters at low grazing angles... View full abstract»

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  • Multistatic-Radar Binomial Detection

    Publication Year: 1978, Page(s):103 - 108
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (838 KB)

    The performance of multistatic-radar binomial detectors is investigated. Although conceptually similar to the well-knwn "M-out-of-N" detector frequently considered for monostatic systems, the multistatic detector must cope with false alarms generated by target et ghosting as well as by noise threshold crossings. A procedure for deriving the detection statistics of multistatic binomial detectors or... View full abstract»

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  • Radar Electronic Counter-Countermeasures

    Publication Year: 1978, Page(s):109 - 117
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1787 KB)

    Employment of electronic countermeasures (ECM) against radars make the use of electronic counter-countermeasures (ECCM) in the radar a necessity. ECCM techniques have evolved over the last several decades. Many ECCM techniques have been described in the open literature. Unfortunately, there have been no recent comprehensive survey papers on this topic. This paper defines ECCM and the various parts... View full abstract»

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  • Some Results on Digital Chirp

    Publication Year: 1978, Page(s):118 - 127
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1615 KB)

    Generating chirp waveforms by means of phase coding yields a simple, cost-effective mechanization. The coding process, however, introduces phase errors whose effect must be included in the design. An approximate analysis is presented, valid for moderate to high compression ratios, which allows error effects on compressed pulse amplitude and sidelobes to be calculated in a simple manner. The anayls... View full abstract»

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  • Sequential Scene Matching Using Edge Features

    Publication Year: 1978, Page(s):128 - 140
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3758 KB)

    When radar and optical images are examined in detail, it is often found that the most distinguishable common feature of the two types of images is the shapes of various natural as well as man-made objects. An edge-extraction technique was developed and used to extract the salient edges of the objects of interest. A sequential, hierarchical search technique was implemented in the matching of the im... View full abstract»

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  • Image Registration: Similarity Measure and Preprocessing Method Comparisons

    Publication Year: 1978, Page(s):141 - 150
    Cited by:  Papers (55)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3334 KB)

    An experimental comparison of several similarity measures and preprocessing techniques used for the registration of temporally differing images is carried out. It is found that preprocessing of the images via a gradient operator improves the registration performance. This is in agreement with a derived optimal processor (described in the Appendix) based upon image and temporal difference character... View full abstract»

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  • Characterization of High-Rate QPSK Channel with Adaptive Equalization

    Publication Year: 1978, Page(s):151 - 157
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1331 KB)

    A computer simulation model capable of predicting the performance nce of a high-dta-rate end-to-end communication system with adaptive equalization is described in this paper. The model is used to characterize the behavior of NASA's proposed tracking and data relay satellite system (TDRSS), while accounting for signal distortion effects due to operational conditions and the required hardware are c... View full abstract»

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  • Optimum Spatial Processing of Passive Sonar Signals

    Publication Year: 1978, Page(s):158 - 164
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1130 KB)

    The spatial structure of the likelihood ratio array processor for detecting a monochromatic plane wave signal in Gaussian noise is compared with a conventional beam-forming detector. Conditions are determined under which the optimum detector performs significantly better than the conventional detector. Conditions are also found under which the beamformer is itself near optimal. View full abstract»

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  • A Digital Open-Loop Adaptive Processor

    Publication Year: 1978, Page(s):165 - 171
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1286 KB)

    A new technique for adaptive processing applications, which is superior to the conventional Applebaum-Howells adaptive loop, is presented. The new technique is based on open-loop digital processing and does not have the limitations of the conventional closedloop analog processor. In contrast with the conventional adaptive loop, the open-loop processor has effectively infinite gain, is unconditiona... View full abstract»

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  • An Improved Algorithm for Adaptive Processing

    Publication Year: 1978, Page(s):172 - 177
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (802 KB)

    The Widrow-Hoff least mean square (LMS) algorithm based on the method of steepest descent is conditionally stable. A modified algorithm is given which is unconditionally stable, capable of better performance when used in adaptive filter processing, and provides a more realistic means for simulating the Applebaum-Howells adaptive loop. View full abstract»

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  • Noise Generation of a Switching Regulator

    Publication Year: 1978, Page(s):178 - 184
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1930 KB)

    Analytical and experimental considerations on the surge and noise generated in a typical switching regulator are discussed. There are two kinds of surges which occur in the switching instants of the transistor. These surges appear as high voltages across the semiconductor elements and decrease their reliabilities. Corresponding to the surge generation, noise voltages appear in the output terminals... View full abstract»

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  • Adaptive Tracking Filter for Maneuvering Targets

    Publication Year: 1978, Page(s):185 - 193
    Cited by:  Papers (36)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1841 KB)

    A general method of continually restructuring an optimum Bayes-Kalman tracking filter is proposed by conceptualizing a growing tree of filters to maintain optimality on a target exhibiting maneuver variables. This tree concept is then constrained from growth by quantizing the continuously sensed maneuver variables and restricting these to a small value from which an average maneuver is calculated.... 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
Michael Rice
Brigham Young University