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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date May 1974

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Displaying Results 1 - 25 of 26
  • Table of contents

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

    Publication Year: 1974 , Page(s): c2 - 416a
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  • From the Editors

    Publication Year: 1974 , Page(s): 305
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  • Military Satellite Communications Using Small Earth Terminals

    Publication Year: 1974 , Page(s): 306 - 318
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    Satellite communications technology has reached the stage at which it is feasible to develop a reliable military tactical communications system using small transportable Earth terminals. This paper discusses the design considerations involved for a multiple-access system, with particular reference to the Earth terminals. View full abstract»

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  • Kalman Filter Applications in Airborne Radar Tracking

    Publication Year: 1974 , Page(s): 319 - 329
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3100 KB)  

    This paper studies the application of Kalman filtering to single-target track systems in airborne radar. An angle channel Kalman filter is configured which incorporates measures of range, range rate, and on-board dynamics. Theoretical performance results are given and a discussion of methods for reducing the complexity of the Kalman gain computation is presented. A suboptimal antenna controller which operates on the outputs of the angle Kalman filter is also described. In addition, methodological improvements are shown to exist in the design of range and range-rate trackers using the Kalman filter configuration. View full abstract»

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  • Output Signal-to-Noise Ratio for Amplitude and Intensity Modulated Laser

    Publication Year: 1974 , Page(s): 330 - 338
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    General expressions are obtained for output SNR for both amplitude- and intensity-modulated lasers, where bandlimited Gaussian noise has been chosen as a modulating signal, and in the presence of background light. Two types of modulating signals are considered: the baseband and bandpass modulating signals. Detailed calculations are made for output SNR when an ideal narrowband optical filter is used. The dependence of output SNR on several parameters, such as the center frequency of the modulating signal, the effective average quantum rate, and input SNR, are discussed. In addition, the difference in performance between amplitude and intensity modulation is discussed. The detection characteristics of the homodyne system are also considered. View full abstract»

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  • Optimal Inputs for Nonlinear Process Parameter Estimation

    Publication Year: 1974 , Page(s): 339 - 345
    Cited by:  Papers (3)
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    The sensitivity of observed data to an unknown parameter is enhanced by utilizing optimal inputs. The derivation is given for the optimal input of an nth-order nonlinear differential equation. To obtain the optimal input, the solution of 4n two-point boundary value equations is required. Numerical resutis are given for a second order linear example. The optimal return is compared with the return obtained for a step input. The existence of a critical time length is demonstrated. View full abstract»

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  • An Automatic Timing Receiver System Based on the Loran-C Navigational Network

    Publication Year: 1974 , Page(s): 346 - 352
    Cited by:  Papers (1)
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    This paper describes some new concepts in dealing with the circuitry for Loran-C automatic timing systems. The conventional analog techniques associated with phase-adjusting networks have been replaced by an incremental digital phase-shifting device. The Loran-C period generator includes facilities for delay compensation by means of an epoch monitor producing a 1-Hz output coincident with the master station TOC (time of coincidence). The required initial time information has to be accurate within ± 20 ms. The automatic format identification and decoding equipment together form a system which takes into account the information of every Loran-C pulse. Owing to the use of digital signal treatment, the synchronization accuracy is limited only by the resolution of the incremental phase shift. The automatic cycle selection device is based on sampling techniques where the derivative of the envelope is calculated. The time of coincidence has to be precalculated and fed into the thumbwheel memory of the epoch monitor, which is automatically initiated when the synchronizing operations are concluded. For VLBI purposes and transcontinental use, the accuracy of this system will be better than 1 ¿s when post corrections, supplied by the U.S. Naval Observatory, are taken into account. View full abstract»

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  • Correlation Techniques of Image Registration

    Publication Year: 1974 , Page(s): 353 - 358
    Cited by:  Papers (76)  |  Patents (20)
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    An extension to the basic concept of correlation detection as a means of image registration is developed. The technique involves linear spatial preprocessing of the inages to be registered prior to the application of a correlation measure. This preprocessing operation utilizes the spatial correlation within each image and greatly improves the detectability of image misregistration. An analysis of the computational aspects of the algorithm is given. Also, results of a computer simulation to evaluate the technique are given. View full abstract»

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  • Rapid Aquisition Signal Design in a Multiple-Access Environment

    Publication Year: 1974 , Page(s): 359 - 363
    Cited by:  Papers (1)
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    Acquisition in a communication receiver is the operation of determining the arrival time of a transmitted periodic timing marker. This is generally accomplished by sending a known acquisition waveform to aid in the arrival time measurement. Certain classes of waveforms are called rapid acquisition waveforms and are advantageous for reducing the time to acquire when sequential methods are used. A multiple-access acquisition environment occurs when a multiplicity of transmitter-receivers are attempting to each individually perform an acquisition operation, each pair interfering with all others. In this paper, a study is made of the interference effects when rapid acquisition techniques are used in a multiple-access environment. The prime object is to determine the manner in which the actual acquisition waveform structure effects the overall system performance. When interference variance is used as a criterion, it is shown that rapid acquisition waveforms made up of component waveforms having disjoint, flat, wideband spectra produce minimal interference. The result suggests the use of coded tone acquisition waveforms. The results have primary application to ranging, surveillance, or navigation operations performed in a many-user situation. View full abstract»

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  • On the Mean Frequency Measurement System Using Correlation Detection

    Publication Year: 1974 , Page(s): 364 - 372
    Cited by:  Papers (2)
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    This paper is concerned with the problem of measuring the mean frequency of the power spectrum of a zero-mean, stationary, narrowband Gaussian random signal in the presence of additive Gaussian noise. Signal-to-noise ratios at the output of the mean frequency measurement system using correlation detection are analyzed in terms of input signal-to-noise ratio, input signal and noise bandwidths, and integration time. The results obtained are verified experimentally, and a comparison with a conventional zero-crossing detector is also made. View full abstract»

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  • On First Cycle Slip Time of Phase-Locked Loops in Cascade

    Publication Year: 1974 , Page(s): 373 - 379
    Cited by:  Papers (2)
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    Precise measurement and spacecraft tracking are obtained by using phase-locked loops in cascade in two-way communications links. Statistics on cycle slip time are of vital importance in system planning and design. This paper presents: 1) results of a computer simulation study of the mean time to first cycle slip of cascade phase-locked loops preceded by bandpass limiters, and 2) the determination of probability distributions of cycle slip. Numerical results are obtained for a typical coherent communication system. View full abstract»

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  • Calculating the Effect of Uneven Terrain on Glide Path Signals

    Publication Year: 1974 , Page(s): 380 - 384
    Cited by:  Papers (3)
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    A method for calculating the bends in the glide slope due to uneven terrain is presented. A computer program written for the purpose enables the calculation of the difference in depth of modulation (DDM) at any point, taking into account the effect of uneven terrain. Results are presented for a hypothetical case of a hill in front of the runway. The program enables us to predict the glide slope bends due to irregular terrain, so that proper selection of glide slope antenna location can be made. View full abstract»

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  • The Effects of Notch Filters on the Correlation Properties of a PN Signal

    Publication Year: 1974 , Page(s): 385 - 390
    Cited by:  Papers (6)
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    With wideband pseudo-noise (PN) communications systems, it is sometimes desirable to supplement the inherent interference rejection capabilities by adding notch filters to attenuate relatively narrowband interference. This correspondence presents an investigation of the effects of notch filters on the performance of PN correlation receivers. A theoretical analysis of the correlation drop due to filter distortion has been conducted and confirmed by experimentation. Additional measurements and analysis have established the trade-off between correlation drop and interference suppression as a function of interference bandwidth. A typical result is that by incurring a penalty of a 1-dB drop in correlation peak, interfering signals having bandwidths of 2 to 3 percent of the PN chip rate can be attenuated by 25 dB. View full abstract»

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  • A Time Sidelobe Reduction Technique for Small Time-Bandwidth Chirp

    Publication Year: 1974 , Page(s): 390 - 392
    Cited by:  Papers (5)
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    A filtering technique is described which permits time sidelobe suppression of small time-bandwidth product shirp. Signal-to-noise loss and time sidelobe level sensitivity to Doppler shift are presented for a filtered chirp waveform whose time-bandwidth product is 10. View full abstract»

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  • Correction to "Electromagnetic Effects of Aircraft Wake-Active Feuillet Interaction"

    Publication Year: 1974 , Page(s): 392
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  • Comments on "Optimum Normalization of a Computed Quaternion of Rotation"

    Publication Year: 1974 , Page(s): 392 - 393
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    Additional observations and examples applied to the above correspondence are given. View full abstract»

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  • Exact Angular Accuracy of an Amplitude Comparison Sequential-Lobing Processor

    Publication Year: 1974 , Page(s): 393 - 398
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    Assume E1 and E2 are the squares of two sequential envelopes from the sequential lobing of an antenna in a given plane. Independent thermal noise is generally present in the envelopes. The statistic e = (E2 ¿ E1)/(E2 + E1) has been used as an estimate of the angle to a target for the significant region of small angles compared to a beamwidth. For a nonfading target, the probability density and characteristic function of e are obtained in closed form. Thence, the exact bias, standard deviation, and rms error in estimating the noise-free value e of e are obtained for all e and signal-to-noise ratios. The same type of statistic as e can be used to estimate time delay in a split range gate tracker. View full abstract»

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  • Corrections to "Adaptive Trackers Based on Continuous Learning Theory"

    Publication Year: 1974 , Page(s): 398
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  • Corrections to "Identification of Aircraft Stability and Control Parameters Using Hierarchical State Estimation"

    Publication Year: 1974 , Page(s): 399
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  • Corrections to "The DFTSD: A Sequential Suboptimum Processor for Multiple-Range-Bin Radar Systems"

    Publication Year: 1974 , Page(s): 399 - 400
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  • 1974 Pioneer Award

    Publication Year: 1974 , Page(s): 401 - 402
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  • Information Dual Mode Transportation

    Publication Year: 1974 , Page(s): 403 - 412
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    Dual Mode Transit has been suggested as a possible solution to some of the problems associated with transportation in the world today. This paper summarizes the program developed by the Urban Mass Transportation Administration in order to develop and test the Dual Mode concept from the viewpoint of GM, one of the contractors participating in the Concept Design phase of the program. The baseline system design proposed by the contractor and the general scenario which Dual Mode Transìt is intended to satisfy are also covered in some detail. View full abstract»

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  • Table of contents

    Publication Year: 1974 , Page(s): 413
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  • IEEE AES - An Invitation

    Publication Year: 1974 , Page(s): 414 - 415
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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