IEEE Transactions on Aerospace and Electronic Systems

Issue 1 • Jan. 1974

Filter Results

Displaying Results 1 - 25 of 34
  • Table of contents

    Publication Year: 1974, Page(s):c1 - 176-b
    Request permission for commercial reuse | |PDF file iconPDF (1370 KB)
    Freely Available from IEEE
  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1974
    Request permission for commercial reuse | |PDF file iconPDF (777 KB)
    Freely Available from IEEE
  • From the Editors

    Publication Year: 1974, Page(s): 1
    Request permission for commercial reuse | |PDF file iconPDF (82 KB)
    Freely Available from IEEE
  • Analysis of a Dithering Loop for PN Code Tracking

    Publication Year: 1974, Page(s):2 - 9
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1266 KB)

    The tracking performance of a dithering loop in the presence of white Gaussian noise is analyzed and compared to the performance of a delay-lock loop. Performance curves are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Chirp Waveform Generation Using Digital Samples

    Publication Year: 1974, Page(s):10 - 16
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1536 KB)

    This paper describes two methods of generating an analog frequency-modulated waveform by the use of a small number of digital samples of the "chirp" waveform. The number of digital samples required is a function of the time-bandwidth product. For certain values of time-bandwidth product, this type of signal generation becomes extremely efficient. Several proofs are offered which show how to select... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Statistical Analysis of Velocity Measuring Systems Employing the Photon Correlation Technique

    Publication Year: 1974, Page(s):17 - 24
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3102 KB)

    Velocities of fluid flows and solid objects can be measured by performing photon count correlations on laser light scattered from the measuring region, the most common optical configuration being the laser Doppler system. A statistical analysis for the counting process is presented for both the constant velocity case and for turbulent fluid flows with formulations for specific laser Doppler config... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Developments in Radar and Radio Sensors for Aircraft Navigation

    Publication Year: 1974, Page(s):25 - 33
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2379 KB)

    Recent developments in airborne Doppler and ground mapping navigation radars and ground and satellite based radio systems are described. Simultaneous lobing and slope tracking techniques can remove the well-known Doppler sea bias error in fast and slowly moving vehicles. Doppler velocity information can be extracted from coherent forward-looking mapping radars, and high position fixing accuracy ca... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Precision Stabilization Systems

    Publication Year: 1974, Page(s):34 - 42
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2031 KB)

    This paper discusses the relationships that must be considered in analyzing the design and performance of typical precision stabilization systems. In particular, the disturbance inputs that are due to kinematic and geometrical coupling are examined in depth by considering systems implemented with either a conventional two-axis gimbal or a traditional half-angle mirror assembly. The disturbance cou... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Detection of Slow Fluctuating Targets with Frequency Diversity Channels

    Publication Year: 1974, Page(s):43 - 52
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3052 KB)

    In this paper an exact closed-form expression for the radar detection probability is derived and results are plotted for a frequency diversity radar receiver. The receiver model performs post-detection integration on all received pulses in all diversity channels. The target model assumed is the slow fluctuating Rayleigh-distributed (Swerling case I target) scatterer. Each of the M frequency divers... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Engineering and Electrical Engineering - Supply and Demand

    Publication Year: 1974, Page(s):53 - 57
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1368 KB)

    Change in employment of engineers is shown to be related to the Deutsch and Shea Index of Engineering Demand. A relationship is given that shows the changes in engineering employment on a quarterly and annual basis. Engineering employment has turned upward for the first time since the last quarter of 1969. We have displaced and stored over 90 000 qualified engineers since 1969, in addition to disp... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Azimuth-Elevation Estimation Performance of a Spatially Dispersive Channel

    Publication Year: 1974, Page(s):58 - 69
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2254 KB)

    A model is presented for the estimation of azimuth and elevation in a dispersive media where the signals come from a continuum of directions. These bounds depend upon the array ambiguity patterns and the channel spread function. Specific cases are discussed showing how the result reduces to an easily tractable analytical tool in many cases of interest. The model discussed is applicable to angular ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Effect of Interfering Signals on the Performance of Angle of Arrival Estimates

    Publication Year: 1974, Page(s):70 - 77
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1063 KB)

    The performance of angle of arrival estimates using an array in the presence of interfering signals is evaluated using the Cramer-Rao bound. To do this, a model for interference is developed which presents the interference as narrowband, temporally white, but spatially correlated, noise. The bound is evaluated and it is shown to depend upon the ambiguity function of the array and spatial correlati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Output Probability Density Functions for Cross Correlators Utilizing Sampling Techniques

    Publication Year: 1974, Page(s):78 - 81
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1006 KB)

    Sampling techniques provide a practical means of obtaining cross-correlation functions. In this paper, the correlation function is described by sums of the form Z = begin{equation*}Z = Sigma^{N}_{j=1}X_{j}Y_{j}end{equation*}. A general expression is derived for the probability density function of the random variable Z under the condition that Xj and Yj are stationary, jointly Gaussian random proce... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transformation of the Spectrum of a Signal in Communication between Relativistically Moving Inertial Frames

    Publication Year: 1974, Page(s):82 - 93
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2466 KB)

    Future space exploration may involve communications between spacecraft moving at relativistic velocities. One of the significant problems associated with such communication is spectral distortion of signals which are propagated between relativistic frames. This distortion is generated by both changing propagation distances and purely relativistic electromagnetic field transformations. In this pape... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sonar Array Detection of Gaussian Signals in Gaussian Noise of Unknown Power

    Publication Year: 1974, Page(s):94 - 99
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1640 KB)

    A statistical test is postulated for detecting, with an M-element hydrophone array, a Gaussian signal in spatially independent Gaussian noise of unknown power. The test is an extension of the uniformly-most-powerful (UMP) unbiased test for a two-element array. The output signal-to-noise ratio of the test is calculated and, for a large number of independent space-time samples, is shown to be no bet... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of Starting Circuits for a Class of Hard Oscillators: Two-Transistor Saturable-Core Parallel Inverters

    Publication Year: 1974, Page(s):100 - 112
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2945 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamics of a Solenoidal-Torqued Gyro-Stabilized Seeker Assembly for Guidance and Tracking

    Publication Year: 1974, Page(s):113 - 122
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1714 KB)

    Several low-cost gyro-stabilized, bang-bang seeker assemblies for missile guidance and tracking applications have used similar physical structures. A magnetic dipole is an integral part of the gyro rotor assembly. The nominal spin axis of the gyro is colinear with the axis of a cylinder about which is wound a helix of wire. By properly modulating the current that is passed through that helix, the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dynamics of an Eddy-Current-Torqued Gyro-Stabilized Assembly

    Publication Year: 1974, Page(s):123 - 127
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (444 KB)

    Prominent among the commonly encountered gyro-stabilized assemblies used in guidance and tracking are those which are eddy-current torqued. Although eddy-current-torquecd lead- computing gunsights, which use spinning mirrors, have been well known for thirty years, it has been difficult to find an analysis of the torques developed by the precession mechanism. In this paper a model configuration of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Use of the Navy Satellite System in Geodetic Surveying

    Publication Year: 1974, Page(s):128 - 135
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1990 KB)

    The question of how multiple-pass data from the Navy Satellite System can be processed to yield an optimal estimate of the latitude, longitude, and elevation of a point on the Earth's surface is considered. It is demonstrated that the problem can be treated by use of modern estimation techniques. Two methods are considered: Kalman estimation and weighted least-squares estimation. The variance of t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic Effects of Aircraft Wake-Active Feuillet Interaction

    Publication Year: 1974, Page(s):136 - 143
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2318 KB)

    A mechanism by which an aircraft wake can interact strongly with the electromagnetic radiation present in an active elevated anomalous refractivity region (active feuillet) is analyzed. The aircraft wake structure, assumed to consist of twin contrarotating vortices plus entrained irrotational gas, trailing behind the wings of typical large aircraft is shown to be capable of descending a distance o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Atmospheric Attenuation Models for Satellite-To-Earth Links

    Publication Year: 1974, Page(s):144 - 149
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (830 KB)

    In an earlier paper by the authors1 it was mentioned that atmospheric attenuation effects could be included by assuming that the attenuation is directly proportional to number of air masses. While this assumption is valid for the optical region, it is not true in the microwave region (1 to 40 GHz). For a clear atmosphere, the two constituents which absorb microwaves are oxygen and water vapor. An ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Baseband Modeling and Distortion Equalization of the Feedback FM Demodulator by Functional Methods

    Publication Year: 1974, Page(s):149 - 152
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (630 KB)

    Exact and approximate baseband models for the feedback FM demodulator are derived. Exact and approximate distortion equalizers that may be used to remove distortion in the output of the demodulator are also presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimation of Clutter Cross Section

    Publication Year: 1974, Page(s):152 - 153
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (318 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • MTI Weightings

    Publication Year: 1974, Page(s):153 - 156
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (667 KB)

    A comparison is made between optimum weighting, which maximizes Pd for a given α, and several MTI weightings. It is shown that a special case of the optimal weighting is approximately equal to the MTI weighting which maximizes the MTI improvement factor. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Clutter Reduction Technique for Random Signal Radars

    Publication Year: 1974, Page(s):156 - 160
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (808 KB)

    The performance of certain radars is degraded in environments with significant clutter returns, and since the clutter is signal-generated, increasing the transmitted power does not improve the situation. However, changing the pulse width and pulse period of the transmitted signal can increase the input signal-to-interference ratio. In this correspondence, the transmitted signal is made up of pulse... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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
Michael Rice
Brigham Young University