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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • Date May 1969

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Displaying Results 1 - 25 of 28
  • Table of contents

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

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

    Publication Year: 1969, Page(s):361 - 362
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  • Atomic Power-Who Looks After Public Safety?

    Publication Year: 1969, Page(s):363 - 375
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5084 KB)

    In this new technology the history to date adds up to a very small record of operating experiences, along with a variety of deficiencies and failures. s. At this stage the development of atomic power suffers from a urge of over-optimistic promotion plus a general breakdown in engineering responsibility and control of safety that could culminate in a national catastrophe. View full abstract»

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  • Pull-In Performance of a Piecewise Linear Phase-Locked Loop

    Publication Year: 1969, Page(s):376 - 386
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2902 KB)

    This is part of a study concerned with the analysis of phase-locked loops (PLL's). The broad objective throughout this work is to improve upon our general understanding in this important area. More particularly, ly, we are seeking quantitative results indicative of the pull-in behavior of PLL's. In the present paper, we point out some results in foreign publications and focus attention on a paper ... View full abstract»

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  • The Effect of Limiting a Biphase or Quadriphase Signal Plus Interference

    Publication Year: 1969, Page(s):387 - 395
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2223 KB)

    This paper analyzes the case of limiting an incoherent or coherent interference signal at the frequency of a biphase or quadriphase digital signal. The results give the IM products, interference, and attenuation of the digital signal, plus interference through a hard limiter. View full abstract»

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  • VLF Multirange Navigation Errors

    Publication Year: 1969, Page(s):396 - 416
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4029 KB)

    The fix error, for long-distance XIF navigation systems in which the distances to two or three ground-based stations are determined, is a function of the "angles of cut" of the lines of position, the standard deviation of the errors in determination of the distances (ranges) to the stations, and the degree of correlation of these distance determinations. An analysis is made of the errors which occ... View full abstract»

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  • The Performance of Analog Correlators for Several Integrator Functions

    Publication Year: 1969, Page(s):417 - 422
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1393 KB)

    A measure of analog correlator performance is considered and interpreted reted as an output signl-to-noise ratio. This quantity is shown to depend on the fourth-order expectation of the input signals and the characteristics of the integrating system. Based on the output signal-to-noise ratio, figures of merit are established for correlators utilizing an ideal low-pass filter, an RC filter, and a f... View full abstract»

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  • Modeling Nonstationary Random Processes with an Application to Gyro Drift Rate

    Publication Year: 1969, Page(s):423 - 428
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1625 KB)

    The problem of estimating the a priori statistics of a nonstationary process is considered using finite-time averages of experimental data. A model of the form of a linear time-invariant difference equation with a stationary independent random sequence driving function is proposed and investigated. Finite-time averages are calculated and then used in a steepest descent method to determine the coef... View full abstract»

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  • On the Treatment of Inertial Measurement Unit Data in Optimal Linear Navigation Policies

    Publication Year: 1969, Page(s):429 - 440
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2310 KB)

    The inclusion of the integrated nongravitational acceleration outputs from an inertial measurement unit in an optimal linear navigation policy is treated. This formulation appears to be considerably different nt from the treatments of IMU data for space vehicle navigation that have previously been discussed and promises to yield considerably better results in many instances. It has the advantage t... View full abstract»

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  • Doppler Return from a Random Rough Surface

    Publication Year: 1969, Page(s):441 - 449
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2018 KB)

    A theoretical analysis of the Doppler return from a random rough surface ace shows that the Doppler spectrum is composed of three distinct components. The methods of analysis for determining the average power return for the static case and an application of the ergodic hypothesis for a stationary surface show that the assumption of a single Doppler component is based on a smooth surface. In additi... View full abstract»

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  • Synthesis Techniques for a Class of SSB-AM-PM Signals

    Publication Year: 1969, Page(s):450 - 456
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1683 KB)

    This paper develops synthesis techniques for a particular type of single-sideband sinusoidal carrier which is phase modulated by a subcarrier. Mathematical expressions for signal efficiency, sensitivity of design to parameter variation, and ratio of peak to average power are derived and incorporated in a computer program. Given the desired power ratios for modulated signal components, the program ... View full abstract»

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  • Ground Testing of Inertial Navigators to Improve Dynamic Performance

    Publication Year: 1969, Page(s):457 - 462
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1487 KB)

    A ground testing method has been devised to evaluate the dynamic errors of an inertial navigation system. A trimmed stationary inertial system in the navigation mode can be subjected to programmed platform orm drift rates, and generate position outputs which are compared with those of a perfect navigator. The linearized error equations for this testing mode are derived and the resulting position e... View full abstract»

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  • An Electrooptical Automatic Gain Control

    Publication Year: 1969, Page(s):463 - 473
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2749 KB)

    The laser beam affords a valuable carrier medium for an optical calmunication system, but such a system for transmission through the atmosphere is subjected to wide fluctuations in received signal strength because of turbulence. An electrooptical automatic gain control system em has been studied and built which can substantially reduce the effect of these fluctuations. The effect of system paramet... View full abstract»

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  • Stability of a Magnetic Suspension Device

    Publication Year: 1969, Page(s):474 - 485
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5005 KB)

    This paper presents an analysis of a magnetic suspension device which is used in place of mechanical bearings for the gyro rotors of inertial guidance systems. A formula for the suspension device's strength is derived, the criteria for the device's stability is given, and the device's potential instability (when that criteria is violated) is explained. Data are given of an experiment which confirm... View full abstract»

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  • Error Reduction in HF Loop DF Systems

    Publication Year: 1969, Page(s):486 - 498
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4190 KB)

    Techniques for reducing bearing errors in vertical loop HF direction finders for ionospherically propagated signals were evaluated in a dual-channel system. A main channel provides a bearing display from the output of a rotating loop; an auxiliary channel unblanks the bearing ng display when propagation conditions are favorable for minimum bearing error. Circuitry to provide optimum unblanking for... View full abstract»

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  • Packaging Requirements ents for Optimized Malfunction Isolation by Systematic Substitution

    Publication Year: 1969, Page(s):499 - 514
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3399 KB)

    This paper describes a malfunction isolation technique which is applicable, primarily, to electronic systems. The technique is effective for essentially 100 percent of all failures, including multiple,terintermittent, interconnection, and closed-loop failures, to the discard-at-failure (DAF) hardware level. The value of the technique, in addition to its simplicity and ease of use, is that, in very... View full abstract»

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  • An Automatic System for the Control of Multiple Drone Aircraft

    Publication Year: 1969, Page(s):515 - 524
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2454 KB)

    A conceptual system is proposed and described for the control of a multiplicity of drone aircraft. Each target (drone) aircraft is controlled, during a given mission, over a separate preprogrammed path comprised of straight line and circular arc segments. Full control of each target's altitude, plan position, and velocity is available. Position measurement can be obtained by use of either a radar ... View full abstract»

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  • Optimum Estimation of Bit Synchronization

    Publication Year: 1969, Page(s):525 - 536
    Cited by:  Papers (25)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2735 KB)

    In digital communication systems, optimum estimation and detection algorithms require that precise knowledge of the bit transition time be known to the receiver before bit-by-bit detection can be made. This paper presents the derivation of Bayes or maximum a posteriori estimation algorithms for optimum estimation of bit timing. Performance of the optimum system is evaluated and suboptimal realizat... View full abstract»

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  • An Analysis of the Performance of the Oscillating Limiter Driven by FM Signals Corrupted by Noise

    Publication Year: 1969, Page(s):537 - 547
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3362 KB)

    The behavior of the oscillating limiter (OL) driven by FM signals is surveyed, and its performance with signal corrupted by noise is investigated. For high values of the carrier-to-noise ratio (CNR), if the frequency deviation of the signal is small in comparison with the locking range of the OL, it is calculated, and experimentally verified, that a system OL discriminator is equivalent to a syste... View full abstract»

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  • Multipath Fading in FSK Communication Links - An Experimental al Investigation

    Publication Year: 1969, Page(s):548 - 557
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3914 KB)

    The results of an experimental investigation of binary error rates in an FSK channel experiencing nonselective fading are presented. For all cases considered, the received frequency uncertainty is large compareded to the bit rate, requiring the use of an envelope detector rather than a matched filter. Both slow and fast fading rates are considered and include the effects of differential Doppler sh... View full abstract»

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  • Position Determination from Radio Bearings

    Publication Year: 1969, Page(s):558 - 560
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (549 KB)

    A new, simpler derivation is presented for Stansfield's formulas for the most likely position ion and the distribution of its error when a number of bearings are measured from known locations. The simplification results from the use of complex numbers. Simple results are obtained for the case in which bearings are measured at regular, short intervals along a straight reconnaissance flight path, pr... View full abstract»

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  • On the Statistical Representation of Targets for Detection Studies

    Publication Year: 1969, Page(s):560 - 561
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Statistical distribution functions were determined ined for the radar cross section for flying aircraft. Most distributions could be adequately represented by one or another member of the family of chi-square functions. The degree of freedom parameter varied widely. View full abstract»

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  • Comments on "Jamming Susceptibility"

    Publication Year: 1969, Page(s):561 - 562
    Cited by:  Papers (1)
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  • Performance of an Ideal Quantum Receiver of a Coherent Signal of Random Phase

    Publication Year: 1969, Page(s):562 - 564
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB)

    An ideal quantum receiver is to detect a coherent narrow-band optical signal in the presence of thermal background radiation. Curves are given both of the average probability of error in a binary communication system transmitting O's (blanks) and 1's (pulses) with equal probabilities, and of the probability of detection for various fixed values of the false-alarm probability. 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