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Aerospace and Electronic Systems, IEEE Transactions on

Issue 5 • Date Sept. 1983

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Displaying Results 1 - 23 of 23
  • Table of contents

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

    Publication Year: 1983 , Page(s): c2
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    Freely Available from IEEE
  • From the Editors

    Publication Year: 1983 , Page(s): 657
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  • Position Location from Sensors with Position Uncertainty

    Publication Year: 1983 , Page(s): 658 - 662
    Cited by:  Papers (30)  |  Patents (38)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1015 KB)  

    A statistical analysis of a mixed-mode position-location system with sensors position uncertainty is described. Expressions for the maximum likelihood estimator and its error statistics, under ¿small errors¿ assumption, are derived. View full abstract»

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  • A High-Resolution Radar Detection Strategy

    Publication Year: 1983 , Page(s): 663 - 667
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1179 KB)  

    A comparison of single range cell detection and integrated contiguous range cell detection for a high range resolution radar is presented. A simulation was used to generate probability of detection curves for the two detection strategies using 10 target models with different target scattering characteristics. The integrated range cell detection strategy was found to be superior in all cases except when the target is composed of a single strong flare point. View full abstract»

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  • In-Flight Parity Vector Compensation for FDI

    Publication Year: 1983 , Page(s): 668 - 676
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2106 KB)  

    The performance of a failure detection and isolation (FDI) algorithm applied to a redundant strapdown inertial measurement unit (IMU) is limited by sensor errors such as input axis misalignment, scale factor errors, and biases. A techique is presented for improving the performance of FDI algorithms applied to redundant strapdown IMUs. A Kalman filter provides estimates of those linear combinations of sensor errors that affect the parity vector. These estimates are used to form a compensated parity vector which does not include the effects of sensor errors. The compensated parity vector is then used in place of the uncompensated parity vector to make FDI decisions. Simulation results are presented in which the algorithm is tested in a realistic flight environment that includes vehicle maneuvers, the effects of turbulence, and sensor failures. The results show that the algorithm can significantly improve FDI performance, especially during vehicle maneuvers. View full abstract»

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  • Adaptive Array Behavior with Sinusoidal Envelope Modulated Interference

    Publication Year: 1983 , Page(s): 677 - 687
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2071 KB)  

    The behavior of a LMS (least mean square) adaptive array with modulated interference is described. An interference signal with sinusoidal, double-sideband, suppressed-carrier modulation is assumed. It is shown that such interference causes the array to modulate the desired signal envelope but not its phase. The amount of the desired signal modulation is determined as a function of signal arrival angles and powers and the modulation frequency of the interference. Such interference also causes the array output signal-to-interference-plus-noise ratio (SINR) to vary with time. However, it is shown that when the desired signal is a digital communication signal, the averaged bit error probability is essentially the same as for continuous wave (CW) interference. View full abstract»

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  • Two-Stage CFAR Detectors for Multiple-Range-Bin Radars

    Publication Year: 1983 , Page(s): 688 - 703
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    Two-stage detectors using generalized sign and four-level conditional statistics for signal detection in multiple-range-bin radars are described. The resulting detectors are of constant false-alarm rate (CFAR). Performances are evaluated and compared with singlestage versions. If the a priori probability of either the no-target case or the target-presence case is large (close to 1), a two-stage test can be designed to have the advantage of reducing the average number of samples required without sacrificing detection probability. With the proper choices of parameters, significant improvement in the efficiency can be achieved. Asymptotic relative efficiency of two-stage detectors with respect to single-stage detectors is derived and some numerical results are evaluated. View full abstract»

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  • A Future Solar Orbital Transfer Vehicle Concept

    Publication Year: 1983 , Page(s): 704 - 710
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    The limiting performance of any orbital transfer vehicle (OTV) is fixed by its mass characteristics and the energy content of its propellant. The direct heating of hydrogen to high temperatures can produce practical specific impulses of 790 s which is to be compared with the liquid oxygen/liquid hydrogen limit of about 480 s in practical systems. A solar orbital transfer vehicle (SOTV) has been designed which utilizes a 100 m diameter concentrator system to provide the approximate 10 MW of thermal power needed to provide a nominal thrust level of 2780 N. The SOTV offers a compromise between typical chemical OTVs and electric propulsion OTVs. The SOTV can deliver 16 000 kg to geosynchronous orbit and 5000-10 000 kg to the inner planets. A four-week period for the assembly and payload integration for the SOTV has been found necessary. Several techniques for controlling the thrust level and thermal soak of the heat exchanger have been examined. Two of these, an expandable pupil stop reflector and concentrator surface deformation, are highly competitive. Considerable mission injection opportunity flexibility is possible with more than a 10 h launch window centered about each of local dusk and dawn. View full abstract»

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  • Eigenstructure Assignment for Linear Systems

    Publication Year: 1983 , Page(s): 711 - 729
    Cited by:  Papers (106)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3079 KB)  

    The use of feedback (full state, output, and constrained output) is considered as a means of shaping the transient response of linear time invariant systems. The underlying importance of the eigenstructure (eigenvalues/eigenvectors) is highlighted. Also, the important results and techniques are presented along with a brief literature review. An extensive flight control example is presented which should give direction to the application of eigenstructure assignment in diverse areas. View full abstract»

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  • Detection and Estimation with Fixed Lag for Abruptly Changing Systems

    Publication Year: 1983 , Page(s): 730 - 739
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2270 KB)  

    The problem of state estimation and system structure detection for discrete-time stochastic systems with parameters which may switch among a finite set of values is considered. The switchings are modeled by a semi-Markov, or Markov, chain with known transition statistics. A fixed time delay (lag) is allowed in estimation (smoothing) and detection. The optimal solutions require geometrically increasing computations and storage with time. Suboptimal solutions are proposed to alleviate this problem and simulation results are presented to illustrate the effectiveness of the proposed algorithms and the advantages of introducing a delay in processing of the observations. View full abstract»

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  • Transfer Functions for Partially Coherent SAR Systems

    Publication Year: 1983 , Page(s): 740 - 750
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2306 KB)  

    An impulse response function and a transfer function of use for partially coherent systems are presented. Partially coherent systems are those that transform a complex amplitude input to an output intensity and are encountered in many guises including optical systems, radiometers, scatterometers, astronomical radars, and synthetic aperture radar. (In the fully coherent or noncoherent limits, linear analysis and the associated system descriptions are well known in terms of amplitude or modulation transfer functions, respectively.) Properties are derived herein for partially coherent systems that describe performance dependence on system phase and amplitude match to input signal characteristics and to system and signal partial coherence. Such systems are shown to be energy conservative in the event of coherence variations. Output spectral properties that describe the dependence of multiplicative Rayleigh noise (speckle) on input signal coherence, system coherence, and phase match are presented. Unlike linear systems, partially coherent systems require both (1) the impulse response and (2) a quantitative measure of scene/system coherence to adequately describe their performance. The general formulation of this paper is applied to synthetic aperture radar (SAR) imaging systems to derive closed-form results of importance for that discipline. It is shown that the mean output from a SAR for a random distributed scene input is not dependent on system focus, system coherence, or scene coherence, whereas imagery of scene detail is dependent on these same parameters. The speckle spectrum is a function of system coherence, but not a function of scene coherence or system focus. View full abstract»

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  • An Optimally Integrated Track Recovery System for Aerial Bathymetry

    Publication Year: 1983 , Page(s): 751 - 760
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    An airborne system has been developed for charting shallow coastal and inland waters. The primary components of this system are an aerial survey camera, a profiling laser radar, an analytical stereo plotter, and a multisensor track recovery system (TRS). The TRS comprises a gimbaled inertial navigation system and a number of auxiliary sensors which acquire redundant position and attitude information. The sensor data are combined postmission using a U-D factorized Kalman filter and modified Bryson-Frazier smoother to compute accurate estimates of the orientation parameters of the survey camera at the times of film exposure. These parameters are used to position each overlapping pair of photographs on the analytical plotter to form a stereo image and corresonding analytical stereomodel from which water depth measurements are made. Flight trial results demonstrate that the TRS can achieve radial position and attitude accuracies which exceed 1 m and 2 arcmin root mean square (rms), respectively, and that this level of performance is sufficient to enable water depth measurements to be made to an accuracy of better than 0.65 m (rms). View full abstract»

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  • Adaptive Arrays for Multiple Simultaneous Desired Signals

    Publication Year: 1983 , Page(s): 761 - 767
    Cited by:  Papers (3)
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    Steered beam adaptive arrays for multiple simultaneous desired signals are discussed. It is shown that the performance of a steered beam adaptive array depends upon the range of input signal strengths and the choice of the steering vector. Optimum steering vectors for various input signal strengths are given. All choices of steering vectors are equally effective in the rejection of jammers. View full abstract»

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  • The Information Content of Synthetic Aperture Radar Images of Terrain

    Publication Year: 1983 , Page(s): 768 - 774
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2927 KB)  

    A statistical model is developed that portrays an imaging radar as a noisy communication channel with multiplicative noise, and the model is used to evaluate the average amount of information that can be extracted about a target from its radar image. The average information content is also used to define a measure of radiometric resolution for radar images. It is shown that the information content and the resolution capabilities of an imaging radar reach a limit beyond which an increase in scene dynamic range does not improve the information content or the resolution. This limitation results from the multiplicative nature of the noise introduced in the imaging process. View full abstract»

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  • Signal Reconstruction from the Output Phases and Magnitudes of Two-Dimensional Filters

    Publication Year: 1983 , Page(s): 775 - 776
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    Algorithms are presented for reconstruction of a two-dimensional complex signal by knowing the phases and magnitudes of different filtered versions of the signal for a special class of filters. The algorithms have simple geometric interpretation and are easily extended to N-dimensional systems. View full abstract»

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  • Analytical Results for a Kalman Tracker Using Position and Rate Measurements

    Publication Year: 1983 , Page(s): 776 - 778
    Cited by:  Papers (7)  |  Patents (1)
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    Analytical results are presented for determining the steady-state components of the gain and error covariance matrices of the two-state Kalman tracking filter with white noise maneuver capability. View full abstract»

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  • Upper Bound of a Loop Gain in a Power Inversion Adaptive Array

    Publication Year: 1983 , Page(s): 778 - 780
    Cited by:  Papers (1)
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    A loop gain is an important parameter in a power inversion adaptive array. The upper bound value of the loop gain is obtained which prevents the array suppressing a desired signal seriously. This result is very useful for determining the loop gain. View full abstract»

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  • Comment on "Self-Clutter Cancellation and Ambiguity Properties of Subcomplementary Sequences"

    Publication Year: 1983 , Page(s): 780 - 781
    Cited by:  Papers (3)
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  • A Statistical Glint/Radar Cross Section Target Model

    Publication Year: 1983 , Page(s): 781 - 785
    Cited by:  Papers (16)
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    We review the details of the glint (angular scintillation) problem in electromagnetic scattering. These results are employed to develop a statistical glint and radar cross section (RCS) target model featuring the correct glint probability density function, the correct time correlations of RCS and glint, and the correct cross correlation between RCS and glint. This model is suitable for simulation applications, and an implementation scheme for a glint/RCS signal generator is included. View full abstract»

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  • Corrections to "A Fast Beamforming Algorithm for Large Arrays"

    Publication Year: 1983 , Page(s): 785
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  • M. Barry Carlton Award for 1983

    Publication Year: 1983 , Page(s): 786
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  • 1980 - 1982 Update International Cumulative Index on Radar Systems

    Publication Year: 1983 , Page(s): 786-1 - 786-30
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    Freely Available from IEEE

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.

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory