IEEE Transactions on Aerospace and Electronic Systems

Volume AES-17 Issue 1 • Jan. 1981

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Displaying Results 1 - 25 of 29
  • Table of contents

    Publication Year: 1981, Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1981, Page(s):c2 - 160-b
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  • From the Editors

    Publication Year: 1981, Page(s): 1
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  • MSK and Offset QPSK Modulation with Bandlimiting Filters

    Publication Year: 1981, Page(s):2 - 8
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1996 KB)

    It is considered by some that minimum shift keying (MSK) is spectrally more efficient than quaternary phase-shift keying/offset quadrature phase-shift keying (QPSK/OQPSK). An analytical method is presented here for determining the detection efficiencies of MSK and QPSK/OQPSK when the constant-envelope signal is passed through a set of filters and when the resulting signal is corrupted by Gaussian ... View full abstract»

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  • Orbital and Attitude Prediction Accuracy Requirements for Satellites

    Publication Year: 1981, Page(s):9 - 14
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1933 KB)

    This paper examines the criteria for selecting the orbital and attitude prediction accuracy requirements for communications satellites. The accuracy requirements have been analyzed in terms of the various space operations involved, e.g., satellite acquisition, guidance and control, communications, telemetry, and command. It is hoped that the findings of this investigation will prove useful in sate... View full abstract»

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  • Importance Sampling Applied to Simulation of False Alarm Statistics

    Publication Year: 1981, Page(s):15 - 24
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2158 KB)

    The application of importance sampling to the efficient simulation of low-probability events is discussed. Several examples are given to illustrate how the technique works for processes involving single and multiple statistical inputs. A procedure is also given for handling the case of multiple inputs where each is from a different statistical process. View full abstract»

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  • Varieties of Average Monopulse Responses to Multiple Targets

    Publication Year: 1981, Page(s):25 - 28
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1044 KB)

    A monopulse receiver exhibits three apparently distinct types of average response when the radar sees two jammers, two passive targets, or one of each. This variety of response types is analyzed and shown to be consistent, i.e., the responses are shown to be special cases of a general formula which applies to two independent targets with uniformly distributed phase difference. View full abstract»

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  • A Coarse Search Correlation Tracker for Image Registration

    Publication Year: 1981, Page(s):29 - 34
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2717 KB)

    A high-speed compact digital correlation tracker which determines the frame-to-frame translational motion between two images is presented. By combining a similarity detection approach with the correlation coefficient in a parallel pipelined architecture, effective tracking rates comparable to conventional fast Fourier transform (FFT) techniques can be achieved. Examples of the tracker's performanc... View full abstract»

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  • Results from a Four-Element Adaptive Antenna Experiment

    Publication Year: 1981, Page(s):35 - 47
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2389 KB)

    Experimental results from a four-element, linear, half-wavelength spacing, adaptive-array antenna under the control of the least mean square (LMS) algorithm are presented. The array is found to be capable of nulling a 70-MHz signal to -35 dB below a desired signal over a 5-MHz bandwidth. The antenna processing gain is constant over a desired signal-to-jammer signal power ratio range from -20 dB to... View full abstract»

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  • Control of Synchronous Orbit Using Lyapunov Stability Theory

    Publication Year: 1981, Page(s):48 - 53
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB)

    A state-dependent control law is proposed using the Lyapunov stability theorem and its usefulness for closed-loop control of a synchronous orbit is investigated. It is shown that a sequential scheme using a modified control law provides a more practical means of orbit control. View full abstract»

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  • Statistically Linearized Estimation of Reentry Trajectories

    Publication Year: 1981, Page(s):54 - 61
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1961 KB)

    Several filters are applied to the problem of state estimation from inertial measurements of reentry drag. This is a highly nonlinear problem of practical significance. It is found that a filter based on the technique of statistical linearization performs better than the extended Kalman in this application. This is believed to be the first application of the statistically linearized filter to a pr... View full abstract»

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  • Spectral Analysis and Subtraction of Noise in Radar Signals

    Publication Year: 1981, Page(s):62 - 71
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2631 KB)

    A new method of maximum entropy spectral estimation called the revised maximum entropy method (MEM) is formulated and is applied to the spectral analysis of the echo signals from atmospheric turbulence observed by an incoherent scatter radar. The revised MEM is shown free from many demerits of the other methods for spectral analysis. Further it makes it possible to subtract the white noise usually... View full abstract»

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  • Rotating Blades Radio Interference in a Helicopter-Borne CW Doppler Radar

    Publication Year: 1981, Page(s):72 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1719 KB)

    Radio interference generated in a helicopter-borne continuous wave (CW) Doppler radar system due to the rotating blades is analyzed. This problem has been previously treated for the case of pulse Doppler radar systems with very narrow (near zero) beamwidth. In this case the strong interference component returning directly from the blades (with no ground reflection) need not be considered as it rea... View full abstract»

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  • Volume Properties for the Wideband Ambiguity Function

    Publication Year: 1981, Page(s):83 - 87
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1313 KB)

    It is shown that the volume under the wideband ambiguity function is close to the square of the signal energy. The ambiguity volume is asymptotically conserved as the signal approaches the narrowband case. The narrowband ambiguity volume is a lower bound for the volume of the wideband ambiguity function. View full abstract»

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  • Performance of an Electrically Small Antenna Amplifier Circuit

    Publication Year: 1981, Page(s):88 - 92
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1410 KB)

    A technique is presented to calculate the noise figure and available power gain for electricially small antenna amplifier circuits over a wide bandwidth. The method permits reasonable predictions of circuit performance solely from the manufacturer's transistor data, i.e., without resorting to extensive measurements. Results for a system designed for 10 kHz to 500 MHz coverage are presented. The ag... View full abstract»

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  • Interference Immunity Effects in CPSK Systems with Hard-Limiting Transponders

    Publication Year: 1981, Page(s):93 - 100
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1836 KB)

    Transmission characteristics are described for M-ary coherent phase-shift keyed (CPSK) systems with N-stage hard-limiting transponders where noise and multiple continuous wave (CW) interference sources are additively combined in each link. A general expression for the probability density function of the composite phase at the final link is derived; the overall error probability is then obtained fr... View full abstract»

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  • Optimum Windows for Image Registration

    Publication Year: 1981, Page(s):101 - 110
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3046 KB)

    Two-dimensional cross-correlation techniques are applied to the problem of image registration under the assumption of small geometric distortion. Optimum window functions are derived for two performance measures of interest: peak-to-sidelobe ratio and mean-square registration error. The latter is examined in terms of the contribution caused by noise and the contribution caused by geometric distort... View full abstract»

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  • New Autocorrelation and Prediction Techniques for the Demodulation of Binary Signals

    Publication Year: 1981, Page(s):111 - 121
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2083 KB)

    The classic problem of detecting a narrowband signal received in a wideband noise is treated via new techniques, namely, autocorrelation computation and linear adaptive filtering. It is shown by analysis and simulation that the proposed techniques yield probility of bit errors cimparable to those provided by coding techniques. Expressions are derived for the detectability parameter of the new test... View full abstract»

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  • Track Initiation of Occasionally Unresolved Radar Targets

    Publication Year: 1981, Page(s):122 - 130
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2123 KB)

    In a dense detection environment track-while-scan algorithms will introduce many false tracks when processing is performed on a scan-by-scan basis. The maximum likelihood solution involving all detections on all scans is formulated and evaluated for the initiation problem consisting of false alarms, missed detections, and unresolved detections. A comparison is made between the maximum likelihood s... View full abstract»

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  • The Correction of I and Q Errors in a Coherent Processor

    Publication Year: 1981, Page(s):131 - 137
    Cited by:  Papers (103)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1628 KB)

    A method is presented for correcting the gain and phase imbalances and the bias errors of the in-phase and quadrature channels of a coherent signal processor [1] by means of coefficients which are derived from measurements of a test signal. The residual errors after correction depend upon the signal-to-noise ratio (S/N) of the test signal and the degree of filtering used in deriving the correction... View full abstract»

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  • Information for authors

    Publication Year: 1981, Page(s): 138
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  • Retention Probability in a Track-While-Scan Radar

    Publication Year: 1981, Page(s):139 - 144
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    The probability of maintaining the track file, after acquisition in a track-while-scan (TWS) radar, has been formulated and computed under various conditions of initial range, velocity, and track drop time. All calculations are based on a predetermined update probability versus range characteristic. Results, obtainable with a digital computer in just seconds of computing time, readily demonstrate ... View full abstract»

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  • The Maximum Entropy of Radar Resolution

    Publication Year: 1981, Page(s): 144
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (225 KB)

    First Page of the Article
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  • Differential Lobing in Sidelobe Suppression Systems

    Publication Year: 1981, Page(s):145 - 149
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    The sidelobe suppression function in the secondary surveillance radar system is analyzed when separate main and control antenna are used. Their vertical lobing structures are not matched with each other, so a differential lobing pattern comes out whose maxima and minima are enveloped by smooth curves depending on vertical displacement of phase centers and horizon cutoff rates. The developed analys... View full abstract»

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  • Frequency Diversity in Low-Angle Radar Tracking

    Publication Year: 1981, Page(s):149 - 153
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (900 KB)

    Elevation angle errors due to sea-reflected multipath are evaluated theoretically for a radar operating in an off-boresight monopulse tracking mode. The computer simulation accounts only for specular reflection. Angle estimates at three frequencies are assumed to be available. It is shown that one can improve upon a simple average of the three indicated angles by unequally weighting them according... 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