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Aerospace and Electronic Systems, IEEE Transactions on

Issue 6 • Date Nov. 1985

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Displaying Results 1 - 23 of 23
  • Table of contents

    Publication Year: 1985 , Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1985 , Page(s): c2
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  • From the Editors

    Publication Year: 1985 , Page(s): 745
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  • Analytical Steady-State Solution for a Continuous Time Kalman Filter

    Publication Year: 1985 , Page(s): 746 - 750
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    Analytical expressions are given for the steady-state solution to a continuous time Kalman filter for a two-state model where both states are measured. The solution is obtained by a limiting operation on the known solution for the corresponding discrete time case. The solution is visualized in two graphs. The filter transfer function is also given. View full abstract»

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  • Real Time Satellite Position Determination for TDMA Systems

    Publication Year: 1985 , Page(s): 751 - 756
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    A real time satellite position determination method using a single reference station is presented. The satellite position is determined from these three parameters: the distance between the reference station and the satellite that can be obtained by a single-hop measurement, the elevation angle, and the azimuth angle obtained from the antenna encoder. The error of the transmit frame delay is determined from the position equations, together with other possible errors. The accuracy is about ± 42 symbols for a 90 Mbit/s timedivision multiple access (TDMA) system using an encoder with a ± 0.001 Å resolution. View full abstract»

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  • Adaptive Array Behavior with Periodic Envelope Modulated Interference

    Publication Year: 1985 , Page(s): 757 - 766
    Cited by:  Papers (2)
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    A method is presented for determining the effects of envelope modulated interference on a least mean square (LMS) adaptive array. The interference is assumed to have periodic envelope modulation with a bandwidth that is small compared with the carrier frequency. For such interference, the method allows one to calculate the periodic steady-state behavior of the array weights and the resulting array performance. As an example, we compute the effects of an ordinary amplitude modulated (AM) interference signal on the array. It is shown that such interference causes the array to modulate the desired signal envelope but not its phase. With a differential phase-shift-keyed (DPSK) desired signal, AM interference is found to have about the same effect on bit error probability as CW interference. View full abstract»

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  • Wind Oscillatory and Gusting Torque Effect on a Power System

    Publication Year: 1985 , Page(s): 767 - 776
    Cited by:  Papers (3)
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    The dynamics of a wind turbine driven induction machine and the power system to which it is connected in a dispersed mode are described. The sources of disturbances are identified as ramp and low frequency cyclic turbine torque variations as a consequence of sharp fronted wind gusts and tower shadow, rotor unbalance, etc. Studies have been performed for two levels of wind energy penetration in a single area power system and in a multiarea interconnected power system. Results show that substantial wind energy penetration levels can be handled in a multiarea power system. View full abstract»

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  • An Lms Adaptive Array Using a Pilot Signal

    Publication Year: 1985 , Page(s): 777 - 782
    Cited by:  Papers (4)  |  Patents (2)
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    A least mean square (LMS) adaptive array requires a reference signal. When the desired signal contains a pilot signal, it may be used as the reference signal. In this paper the steady-state performance of an LMS adaptive array in which the pilot signal is used as the reference signal is examined. It is shown that the LMS adaptive array occasionally suppresses the desired signal. The loop gain, which is an important parameter, is also considered. View full abstract»

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  • Random Error in ARGOS and SARSAT Satellite Positioning Systems

    Publication Year: 1985 , Page(s): 783 - 790
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1443 KB)  

    ARGOS and SARSAT are two satellite Doppler navigation systems in which low cost ground beacons transmit bursts of stable frequency signals. The Doppler shifted signals received by the satellite provide the positions of the beacons. The positioning error is dominated by a random component, due mainly to the short-term frequency stability of the beacon oscillator. Theoretical analysis and explicit expressions of the random errors are given. View full abstract»

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  • Steady-State Analysis of the Series Resonant Converter

    Publication Year: 1985 , Page(s): 791 - 799
    Cited by:  Papers (42)
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    The series resonant converter is analyzed in steady state, and for constant switching frequency the output current and voltage characteristics are found to be ellipses. The converter operating point can then be easily obtained by superimposing a load line on these elliptical characteristics. Peak resonant capacitor voltage and inductor current are also plotted in the output plane and are dependent to first order only on output current. When peak voltage and current are plotted in this manner, the dependence of component stresses on operating point is clearly revealed. The output characteristics are modified to include the effect of transistor and diode voltage drops, and experimental verification is presented. View full abstract»

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  • A New Resonant Mode Amplifier Produces Clean AC Power

    Publication Year: 1985 , Page(s): 800 - 803
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    A new resonant mode power amplifier design is described which has a number of advantages over the power amplifiers available today. In particular, it has low or no EMI because of the nature of its operation. The new amplifier design is based upon a resonant mode dc-dc converter used in a push-pull configuration. All the advantages of the resonant mode power converters, such as high efficiency, small size and weight, excellent dynamic performance, low or no EMI (compared to PWM switch mode power converter), etc., are present in this new design. View full abstract»

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  • Interference in the 121.5/243 MHz SARSAT Frequency Bands

    Publication Year: 1985 , Page(s): 804 - 817
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2633 KB)  

    In the SARSAT signal environment it is possible to receive many(5 to 20) simultaneous emergency beacon signals combined with voice and interference of various types, all simultaneously occupying essentially the same frequency-time space. The paper first provides a survey of the different sources of interference which occur in the 100 to 500 MHz frequency band. Then the paper examines those sources of interference which enter the 121.5/243 MHz frequency bands of the SARSAT system. View full abstract»

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  • Information for authors

    Publication Year: 1985 , Page(s): 818
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  • Ordered Statistic CFAR Processing for Two-Parameter Distributions with Variable Skewness

    Publication Year: 1985 , Page(s): 819 - 821
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (379 KB)  

    Rohling has developed a constant false alarm rate (CFAR) technique based on ordered statistics of the reference cells. An extension of his technique is presented that maintains a CFAR for two-parameter distributions, with both mean power and skewness variable. The new method is therefore more robust, but has higher CFAR loss than the single-parameter technique. View full abstract»

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  • An Application of Kalman Filtering and Time Averaging to Inertial Guidance Evaluation

    Publication Year: 1985 , Page(s): 821 - 822
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    A method is developed for estimating circular error probable values and circular error probable rate values of an inertial navigation system using the concepts of Kalman filtering and time averaging. View full abstract»

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  • Track Biases and Coalescence with Probabilistic Data Association

    Publication Year: 1985 , Page(s): 822 - 825
    Cited by:  Papers (19)
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    It is shown that probabilistic data association yields biased tracks in a multitarget environment, and the magnitude of the bias is investigated. A critical target separation distance exists, within which the tracks tend to coalesce completely. The problem of track initiation on new targets is also discussed. View full abstract»

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  • Emendations to "Torque, Speed, and Position Control of Induction Machines Using the DQ Model"

    Publication Year: 1985 , Page(s): 825
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  • Author index

    Publication Year: 1985 , Page(s): 826 - 829
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  • Subject index

    Publication Year: 1985 , Page(s): 829 - 835
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  • IEEE Finding your Way

    Publication Year: 1985 , Page(s): 836
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  • IEEE copyright form

    Publication Year: 1985 , Page(s): 837 - 838
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  • IEEE Aerospace and Electronic Systems Society Organization

    Publication Year: 1985 , Page(s): [838]-a
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1985 , Page(s): [838]-b
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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the equipment, procedures, and techniques applicable to the organization, installation, and operation of functional systems designed to meet the high performance requirements of earth and space systems.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory