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Aerospace and Electronic Systems, IEEE Transactions on

Issue 4 • Date July 1974

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Displaying Results 1 - 25 of 32
  • Table of contents

    Publication Year: 1974 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1974
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    Freely Available from IEEE
  • From the Editors

    Publication Year: 1974 , Page(s): 417
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  • Theory of LDV Tracking Systems

    Publication Year: 1974 , Page(s): 418 - 428
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3023 KB)  

    The application of frequency-tracking systems to the analysis of laser doppler velocimeter (LDV) signals degraded by background noise has been studied both theoretically and experimentally. Expressions are derived for both the correlation function and the expected value of the phase derivative in the general case of noise off center from the Doppler frequency, and these results are specialized to ... View full abstract»

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  • Bayesian Detection of Targets of Unknown Location

    Publication Year: 1974 , Page(s): 429 - 435
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1998 KB)  

    In this paper the array detection problem for certain deterministic signals in spatially uncorrelated Gaussian noise is formulated in Bayesian terms and the required likelihood ratios and resulting performance characteristics are obtained. Primary emphasis is on detection of targets of unknown spatial location using a likelihood ratio approach, with the target location treated as a random paramete... View full abstract»

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  • Advantageous Properties of Frequency Division

    Publication Year: 1974 , Page(s): 436 - 441
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2552 KB)  

    The performance of a wideband frequency divider with two independent sinusoidal input signals present is analyzed. Both the case of a relative low-level spurious signal and the case of a relative high-level spurious signal are considered. It is ascertained that a considerable reduction of the spurious signal is achieved and the exact nature of the improvement is dependent on the relative strength ... View full abstract»

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  • Empirical Solar Proton Model for Orbiting Spacecraft Applications

    Publication Year: 1974 , Page(s): 442 - 450
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2036 KB)  

    An empirical model for energetic solar proton fluxes is presented. With this model the effects of such protons on geocentric space missions, to be flown during the next solar active period (1977-1983), and with orbits involving partial magnetospheric shielding, may be estimated. A synoptic background review is given, followed by a detailed discussion of the model's use, errors, uncertainties, and ... View full abstract»

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  • Strapdown Guidance Error Analysis

    Publication Year: 1974 , Page(s): 451 - 457
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1561 KB)  

    A crucial part of so-called ¿strapdown¿ techniques for inertial guidance systems is the generation of the matrix of direction cosines relating the body axes to the reference axes. This is generally done by direct integration of a set of differential equations having the body angular velocities as inputs. This paper is devoted to an error analysis of two commonly used integration schemes, namely,... View full abstract»

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  • Minimizing Effects of Reflected Shocks in Ballistic Ranges

    Publication Year: 1974 , Page(s): 458 - 470
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (8791 KB)  

    Shock waves originating from hypersonic projectiles flown in ballistic ranges and subsequently reflected from the range walls have been found to produce undesirable effects on the measurements of projectile wakes. This paper reports on the mechanisms through which reflected shock waves perturb the wake, the design, and installation of full-scale fiberglas wedge shock attenuation treatments, the de... View full abstract»

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  • Linear FM Signal Formats for Beacon and Communication Systems

    Publication Year: 1974 , Page(s): 471 - 478
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2666 KB)  

    This paper examines the capabilities of the class of linear FM spread-spectrum signals within the context of potential communications systems usage in order to establish some performance criteria and bounds that permit comparison with other spread-spectrum formats. A systematic basis is provided for parameter selection for this class of signals by examining the interaction a mong the frequency-mod... View full abstract»

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  • A Distribution-Free Doppler Processor

    Publication Year: 1974 , Page(s): 479 - 486
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1910 KB)  

    A distribution-free Doppler processor (DFDP) is described. This procedure is applicable to the detection of signals with unknown phase or signals which undergo a change in phase from one observation to the next. The procedure has the characteristic that the false-alarm probability is a constant, independent of the probability distribution of the received data when no signal is present. Also, an es... View full abstract»

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  • Orbit Determination from Passive Range Observations

    Publication Year: 1974 , Page(s): 487 - 491
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1028 KB)  

    An experiment is described by which the ephemeris of a near-synchronous satellite was determined from passive range observations. The data consist of the measured times of reception at ground tracking stations of electromagnetic signals which are radiated from the satellite at regular intervals. A comparison of the ephemeris to one obtained from Doppler tracking indicates an accuracy of better tha... View full abstract»

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  • Real-Time Shipboard Orbit Determination Using Kalman Filtering Techniques

    Publication Year: 1974 , Page(s): 492 - 496
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1336 KB)  

    The real-time tracking and orbit determination program used on board the NASA tracking ship, the USNS Vanguard, is described in this paper. The computer program uses a variety of filtering algorithms, including an extended Kalman filter, to derive real-time orbit determinations (position-velocity state vectors) from shipboard tracking and navigation data. Results from Appolo missions are given to ... View full abstract»

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  • Target Image Frequency Spectrum in Doppler Radars

    Publication Year: 1974 , Page(s): 497 - 503
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1801 KB)  

    A mathematical model to study target image return frequency spectrums in Doppler radars is described. The model includes the effects of eclipsing, sea surface slope distribution, and surface reflectivity characteristics. The procedure of calculations has been computerized and the analytical results are compared to flight-test values obtained from flights over the ocean. The calculated values of am... View full abstract»

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  • Effect of Monopulse Signal Thresholding on Tracking Multiple Targets

    Publication Year: 1974 , Page(s): 504 - 509
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1998 KB)  

    The monopulse angle of arrival measured from two targets may wander far beyond the angular separation of the targets. In order to remove large errors, angle of arrival measurements are passed through a threshold detector and the measurements which do not satisfy the threshold are rejected. Thresholding has the tendency to move the mean indicated angle of arrival away from the stronger target and t... View full abstract»

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  • A Novel Method for Measuring the Polarization Angle of Satellite Radio Waves

    Publication Year: 1974 , Page(s): 510 - 515
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1642 KB)  

    One of the most important parameters for the study of the physics of the ionosphere is the columnar electron content. This can be obtained indirectly by measuring the Faraday rotation of signals emitted from satellites. Many different types of polarimeters have been developed for this purpose. Efforts to develop a new type of polarimeter, suitable for extensive network operation, led to a novel te... View full abstract»

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  • Product Correlator Performance for Gaussian Random Scenes

    Publication Year: 1974 , Page(s): 516 - 520
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1223 KB)  

    Contained herin is a derivation of two figures of merit for evaluating the performance of a product correlator and an associated discriminator curve. The general formulas are valid for both area and one-dimensional scenes. An explicit evaluation of the formulas is presented when the correlation functions are also Gaussian. In this case, the accuracy and probability of false match are found to take... View full abstract»

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  • Progress of Protection of the Environment and Resources in the United States - A Historical Survey

    Publication Year: 1974 , Page(s): 521 - 527
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    State and Federal legislative actions intended to improve and to preserve the quality of our environment and to conserve our natural resources were developed and implemented in a logical sequence, synchronized with our own social development and awareness of the need for specific legislative, punitive, or constructive actions. At all times, the desired legislation was developed through a consensus... View full abstract»

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  • Effects of Range-Doppler Coupling on Chirp Radar Tracking Accuracy

    Publication Year: 1974 , Page(s): 528 - 532
    Cited by:  Papers (32)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (720 KB)  

    Attention is called to the phenomenon of ¿range-Doppler coupling,¿ characteristic of linear FM (chirp) waveforms, and the strong effect this coupling may have on tracking accuracy. Numerical results are presented for simple three-state filters and for a realistic reentry vehicle tracking problem. View full abstract»

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  • Standardization of the Definition of the Radar Ambiguity Function

    Publication Year: 1974 , Page(s): 532 - 533
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (354 KB)  

    A survey of the literature indicates an inconsistency in the definition of the radar ambiguity function. This correspondence suggests a definition consistent with Woodward's intent. View full abstract»

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  • Radar Terminology Project

    Publication Year: 1974 , Page(s): 534
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (173 KB)  

    First Page of the Article
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  • Comment on "Atomic Power: Fallacies and Facts"

    Publication Year: 1974 , Page(s): 535
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  • 19/28 GHz Radio Propagation Research

    Publication Year: 1974 , Page(s): 535 - 536
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (379 KB)  

    First Page of the Article
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  • Corrections to "Directivity-Bandwidth Limitations on Retrodirective Data Links"

    Publication Year: 1974 , Page(s): 536
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  • Serrodyne Frequency Translation Using Stepped Modulation Waveforms

    Publication Year: 1974 , Page(s): 537 - 538
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (283 KB)  

    This correspondence considers the use of a stepped phase shifter as an approximation to continuous phase shifting for serrodyne frequency translation. Variations in translation loss and suppression of undesirable components as a function of the number of steps used is presented. 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