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Aerospace and Electronic Systems, IEEE Transactions on

Issue 5 • Date Sept. 1969

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Displaying Results 1 - 25 of 31
  • Table of contents

    Publication Year: 1969 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Group

    Publication Year: 1969 , Page(s): c2
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  • From the Editors

    Publication Year: 1969 , Page(s): 691
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  • Experiments Involving a Microwave Beam to Power and Position a Helicopter

    Publication Year: 1969 , Page(s): 692 - 702
    Cited by:  Papers (27)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (6624 KB)  

    This paper describes two different experiments involving a microwavebeam and a helicopter. The first experiment utilized a CW microwavebeam to supply a small helicopter with all of the power that it neededfor its propulsion. The second experiment utilized an unmodulated CW microwave beam for supplying a position reference to the helicopterer with respect to roll, pitch, yaw, and horizontal transla... View full abstract»

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  • Space Applications of a Minimization Algorithm

    Publication Year: 1969 , Page(s): 703 - 711
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2509 KB)  

    A detailed account is given of the application of a minimizationprogram to several design problems. Specifically these applications areconcerned with the design of a curve function generator for a massspectrometer for a proposed Mars probe and the design of autonomousshift registers with linear and nonlinear feedback, used for classificationion of binary sequences and counting tasks for spacecraft... View full abstract»

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  • A 60-GHz Multifrequency Radiometric Sensor for Detecting Clear Air Turbulence in the Troposphere

    Publication Year: 1969 , Page(s): 712 - 723
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (4178 KB)  

    The temperature profile in a horizontal path forward of an aircraft canbe sensed with a multichannel 5-mm passive radiometric receivingsystem. The characteristic signature of the multichannel radiometricoutput as a function of time would provide a measure of the range tothe region of temperature discontinuity forward of the aircraft.Applicability to clear air turbulence (CAT) detection is predicat... View full abstract»

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  • Communication Subsystem Design Trends for the Defense Satellite Communications Program

    Publication Year: 1969 , Page(s): 724 - 730
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2120 KB)  

    The Initial Defense Communication Satellite Program (IDCSP) hasbeen implemented successfully and is handling unique and vital militaryary communications. Tradeoff studies now being made are intended todefine the characteristics of the next phases of the Defense Satellite Communications Program (DSCP). This paper discusses briefly thecommunication subsystem design of the IDCSP for backgroundfor-inf... View full abstract»

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  • Elaboration and Research of a Correlative Extremum System for Automatic Navigation of Sea or River Vessels

    Publication Year: 1969 , Page(s): 731 - 736
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1658 KB)  

    This paper deals with a device designed for automatic determinationof coordinates for sea or river vessels sailing along coastlines. It givesa description of the block diagram and technical characteristics of thedevice, along with the results of experimental investigation. View full abstract»

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  • Optimum Integration of Aircraft Navigation Systems

    Publication Year: 1969 , Page(s): 737 - 747
    Cited by:  Papers (4)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2531 KB)  

    A current problem in aircraft navigation is determining how to effect alow cost navigation system consistent with required mission operationswhich will render a high degree of accuracy and reliability. One wayto achieve this is through optimum integration of equipment,subsystems, and computer mechanizations. Consistent with this approach,the overall objectives of this paper are to show the advanta... View full abstract»

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  • Approximations to the Pull-In Frequency of High Order Linear and Nonlinear Loops

    Publication Year: 1969 , Page(s): 748 - 755
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1681 KB)  

    Two methods of approximating the pull-in frequency cp of linearphase-locked loops are presented. Both methods are based on thephysically plausible, but not mathematically apparent, contention thatthe response of the phase error to a step change in mistuning, ¿¿(t),can be used to predict ¿p. The first method uses the ratio of the steadystatetate to peak valu¿¿(t) as a measure of ¿p. In the se... View full abstract»

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  • Aircraft Navigation Using Omega

    Publication Year: 1969 , Page(s): 756 - 761
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1786 KB)  

    This paper describes a study of those aspects of Omega navigationthat are unique to aircraft applications. The main effort of the studyis to use a digital computer to simulate the reception of Omega signals.Three principal conclusions are drawn: the poorer signal-to-noiseratio environment will not preclude reception; interfering carriers willnot preclude reception; and the required velocity-aiding... View full abstract»

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  • Statistical Characteristics ics of the Polarization Power Ratio for Radar Return with Circular Polarization

    Publication Year: 1969 , Page(s): 762 - 769
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2133 KB)  

    In this paper, the radar return from a clutter target illuminated by acircularly polarized wave is investigated statistically. The ratio of theenvelope of the left circular component to that of the right circularcomponent of the return signal is formed, and the probability densityfunctions and cumulative distributions of this ratio are found forlinear, square, and logarithmic law detectors. Plots ... View full abstract»

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  • Synthesis of an Electrical Power System for a Manned Lunar Base

    Publication Year: 1969 , Page(s): 770 - 788
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (10123 KB)  

    Current program planning in the area of lunar surface explorationenvisions missions of increasing energy requirements and duration.During the mid 1970's it has been estimated that the electrical powerrequirements for a 3-man mission of one year duration might be in theorder of 33 000 kWh. Load profiles to support regeneration of fuelcell reactants for lunar roving vehicles and base nighttime opera... View full abstract»

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  • Integral Electronic Charge Controls for High Performance Secondary Batteries

    Publication Year: 1969 , Page(s): 789 - 797
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1660 KB)  

    Requirements and constraints of unattended secondary batteryapplications are outlined and translated into battery charge control designcriteria. Attention is given to battery performance and reliabilityrequirements and power system interfaces. Charge control requirementsents are defined. Implementation analyses and selection of integralcell-level electronic charge controls are detailed. Feasibilit... View full abstract»

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  • Orthogonalization Techniques of a Direction Cosine Matrix

    Publication Year: 1969 , Page(s): 798 - 804
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1834 KB)  

    Three orthogonalization techniques to correct errors in the computeddirection cosine matrix are introduced. One of these techniques is avectorial technique based on the fact that the three rows of a directioncosine matrix constitute an orthonormal set of vectors in aree-threedimensional space. The other two iterative techniques are based onthe fact that the inverse and transpose of an orthogonal m... View full abstract»

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  • Stabilization of Precision Electrooptical Pointing and Tracking Systems

    Publication Year: 1969 , Page(s): 805 - 819
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2810 KB)  

    This paper presents the pointing vector and angular rate relationshipsfor various optical elements as well as techniques developed forestablishing comprehensive analytical models of precision electroopticalstabilization systems. Since the performance of such systemsmay be critically dependent on the disturbance environment and theintegrity of the associated mechanism, these factors are also examin... View full abstract»

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  • Optimum Signals for High-Resolution Radio Transmission Systems

    Publication Year: 1969 , Page(s): 820 - 827
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2276 KB)  

    This paper reports on progress in signal design that has led to improvedresolution capability in radar and communication systems without theuse of complicated signal-processing techniques.Two approaches to the problem of improving resolution capabilityare made. The first approach emphasizes the need to produce sharplypeaked autocorrelation functions. The optimum signal amplitude infrequency is spe... View full abstract»

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  • A New Approach to Estimation of Initial Conditions and Smoothing Problems

    Publication Year: 1969 , Page(s): 828 - 836
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1489 KB)  

    A unified approach utilizing the Kalman-Bucy filtering technique istaken to solve the estimation problem of initial conditions and thesmoothing problem in linear dynamic systems. The equivalencebetween the forward integration method and the backward integrationmethod of the smoothing solution is proved. Complete analyticalsolutions of filtering and smoothing problems of rectilinear motion ofa rand... View full abstract»

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  • Simple Procedures for Radar Detection Calculations

    Publication Year: 1969 , Page(s): 837 - 846
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (6684 KB)  

    The literature of radar contains results of Rice, Marcum, Swerling, and Schwartz in several families of curves, which permit radar engineersto estimate the signal energy ratio required for a given level of detectionperformance. The variety of radar problems, however, makes itimpractical to construct curves for all combinations of radar and targetparameters. The concept of detector loss is used her... View full abstract»

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  • Range Dependent Waveform of an Active Weighted Pulse Compression Receiver

    Publication Year: 1969 , Page(s): 847 - 864
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2085 KB)  

    This paper presents the output waveform of a correlation techniquewhich incorporates time domain amplitude weighting and matchedfiltering. This scheme may be used in pulse compression radars wherefine target detail is desired over an increment of range, the rangewindow. Analytic expressions describing the amplitude, phase, andfrequency modulation of the output waveform are obtained for thecosine-s... View full abstract»

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  • A Note on the Effects of the Ionosphere on Satellite Orbital Corrections in Near-Real Time

    Publication Year: 1969 , Page(s): 865 - 867
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (437 KB)  

    The influence of ionospheric irregularities,e.g., sudden increase of electron content, onthe accurate determination of the position ofa satellite is being investigated. In this note amethod is presented whereby these effects areeasily accounted for in near-real time withoutthe need to know their detail structure. View full abstract»

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  • Effects of Band Limiting on the Detection of Binary Signals

    Publication Year: 1969 , Page(s): 867 - 870
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (704 KB)  

    PCM/NRZ systems operating in the presenceof noise and in a band-limited channel areconsidered. Two types of bit detectors arestudied, integrate and dump, and sample. Theincreased signal power needed to give thesame performance as an optimum detectorand a broad-band channel is computed. Theresults depend on the bit pattern. The averageeffect of band-limiting over all bit patternsand two extreme cas... View full abstract»

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  • Some Interpretations of Swerling's Case 3 Target Results, with Possible Extensions

    Publication Year: 1969 , Page(s): 870 - 872
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (516 KB)  

    The similarity between the distribution lawfor the Swerling Case 3 target model and acertain member of the log-normal family isdemonstrated. This similarity is then used topredict some important features of the detectionprobability characteristic for that model.The predictions are found to be highly accurateand suggest possible extensions of theunderlying method to the case of truly lognormalsigna... View full abstract»

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  • Measured Gain Improvement Characteristics of a Space Diversity Antenna System

    Publication Year: 1969 , Page(s): 872 - 875
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (605 KB)  

    A two-element adaptively phased array withelement gains of 18 dB was assembled andevaluated at 136 MHz. The gain improvementof the system over that of a single element wasmeasured while tracking ATS-C. The measuredgain improvement fell within 0.5 dB ofthe theoretical maximum 90 percent of thetime, corresponding to a normalized improvementof 2.5 dB for the two-element array. Athorough analysis of t... View full abstract»

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  • Comments on Stabilization of a Satellite

    Publication Year: 1969 , Page(s): 875
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (179 KB)  

    An expression is derived for the cost resultingfrom the stabilization of a satellite using aspecific optimal control (SOC). An exampleis given in which the optimal and SOC yieldvirtually identical costs. View full abstract»

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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.

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory