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Aerospace and Electronic Systems, IEEE Transactions on

Issue 1 • Date Jan. 1983

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Displaying Results 1 - 19 of 19
  • Table of contents

    Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Page(s): c2
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  • From the Editors

    Page(s): 1
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  • Performance Analysis of a Dwell-Time Processor for Monopulse Beacon Radars

    Page(s): 2 - 16
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    Performance of a monopulse air traffic control radar beacon system (ATCRBS) target data extractor is analyzed via an analytical approach. Results refer to a statistical analysis of the section of the receiver which associates replies sent by the desired aircraft during the antenna dwell-time. Some numerical results are reported which refer to the ATCRBS section to be devised in the discrete address beacon system (DABS). View full abstract»

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  • Reply Correlation Test Analysis in Monopulse Beacon Radars

    Page(s): 17 - 29
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    The statistical behavior of the position data furnished by single air traffic control radar beacon system (ATCRBS) reports is analyzed. Some statistical models are correspondingly derived in order to be employed for the performance evaluation of the dwell-time section of the ATCRBS monopulse receiver. The expression of the failure probability is derived for the range and azimuth tests performed by the association algorithms operating in the monopulse ATCRBS target data extractor. Some numerical results are reported referring to the evaluation of the above failure probabilities in different conditions. View full abstract»

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  • Steered Beam and LMS Interference Canceler Comparison

    Page(s): 30 - 39
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    The performance of two kinds of interference cancelers is compared, namely, a constrained steered beam interference canceler (CSBIC) and a least mean square interference canceler (LMSIC). For simplicity, this is done for a two-element array. In our comparison we use the array output desired signal-to-interference power ratio (SIR) and the desired signal-to-noise ratio (SNR). These power ratios are obtained for the CSBIC and LMSIC under two sets of conditions: 1) The error in the assumed angle of incidence for the CSBIC is small, and the LMSIC operates in a codetracking mode. 2) The error in the assumed angle of incidence for the CSBIC is large, and the LMSIC operates in a code-acquisition mode. Comparison of the corresponding power ratios obtained under these two sets of conditions then establishes the condition under which it is more desirable to use a CBSIC as compared with an LMSIC. View full abstract»

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  • Signal-to-Noise Ratio of Arbitrary Power-Series Nonlinear Amplifier

    Page(s): 40 - 48
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    A general analysis of the effect of an arbitrary power-series nonlinear amplifier followed by a coherent mixing device on signal-to-noise ratio (SNR) is performed. An expression is derived for the improvement factor which is defined as the logarithm of the ratio of the output SNR to the input SNR. This expression is applicable to the coherent amplitude detector and phase locked loop as well as noncoherent amplifier by appropriate selections of the detection angle. Moreover, the improvement factor can be obtained for noise with an arbitrary amplitude distribution. To demonstrate the applicability of this analysis, the improvement factors of the nonlinear amplifiers such as a power-law amplifier and a power-series amplifier with positive and negative discriminations are numerically calculated for the cases where the input noise amplitude distributions are Rician and triangular. View full abstract»

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  • ARMA Time Series Modeling: an Effective Method

    Page(s): 49 - 58
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    The ability to generate rational models of time series plays an important role in such applications as adaptive filtering, spectral estimation, digital control, array processing, and forecasting. A method for effecting an autoregressive moving average (ARMA) model estimate is presented which possesses a number of admirable properties: 1) it has an elegant algebraic structure, 2) its modeling performance in spectral estimation applications has been empirically found to typically exceed that of such contemporary techniques as the periodogram, the Burg method, and the Box-Jenkins method on a variety of problems, 3) it is implementable by computationally efficient algorithms, and 4) it is based on pseudomaximum likelihood concepts. Taken in combination, these properties mark this method as being an effective tool in challenging applications requiring high modeling performance in a real time setting. View full abstract»

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  • A Microprocessor-Based Data-Acquisition System for Stall/Spin Research

    Page(s): 59 - 70
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    Accurate data are necessary for the identification of aerodynamic parameters at high angle of attack and in spinning flight. Modern sensors and microelectronic devices are employed in a stall/spin data acquisition system that will be tested in a Schweizer 2-32 sailplane. This instrumentation package will use a quaternion-based ¿strapdown IMU¿ algorithm to derive vehicle attitude from angular rate data, and it will use fault-detection logic to identify inflight sensor failures. Details of the system and flight test program are presented, together with results of preflight digital simulation analysis. View full abstract»

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  • Hardware-Constrained Hybrid Coding of Video Imagery

    Page(s): 71 - 84
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    The design, implementation, and performance of a video bandwidth compression system is described. In this system, compression is obtained by several methods including the use of DCT/DCPM hybrid coding, frame rate reduction, and resolution reduction. The overall compression ratio is up to 1000:1. The hardware-constrained design of the DCT and the DPCM is described and a new method is derived to solve the optimum integer bit-assignment problem associated with the block quantization process in the DPCM. Computer simulation results are presented which predict that the performance of the system using the derived optimal bit assignment method is superior to those obtained by other bit assignment methods. The real-time hybrid coding system design is optimized for a set of ¿modified¿ average statistics to compress a wide variety of input video images. This approach eliminates the problem of nonzero dc mean value which could otherwise cause serious degradations in the system performance. The compression system is fully implemented and the quality of the reconstructed video as predicted by computer simulation has been demonstrated by the actual hardware performance. The PSNR of the reconstructed imagery is in excess of 36 dB at 2 bits per pixel. View full abstract»

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  • Bootstrap Algorithms for Parameter and Smoothing State Estimation

    Page(s): 85 - 88
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    Two-stage bootstrap algorithms for simultaneous smoothing state and parameter estimation of linear dynamical system are developed. Cases of both fixed point and fixed lag smoothing have been considered. Simulation results pertaining to a satellite tracking system are presented for illustration. View full abstract»

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  • An Analog Open-Loop Adaptive-Array Antenna System

    Page(s): 89 - 102
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    A new open-loop adaptive-array system with excellent transient behavior is presented. The system is constructed of analog circuits and determines complex weights without using the feedback of the array output. The performance attainable with the system is described in detail. It is shown that the convergence rate of the system does not depend on a noise environment but is determined by the time constant of the low-pass filters included. Moreover, it is shown that although the steady-state performance is quite good when the interference sources differ widely in signal strength, the steady-state performance can be far below optimum when two or more interference sources are present at roughly equal power levels. View full abstract»

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  • Asynchronous Performance of Slitted Rotor Reluctance Machines: Saturation Effects

    Page(s): 103 - 113
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    Analytical investigation based on limiting nonlinear theory presented here for the asychronous performance of a slitted solid iron rotor reluctance machine include the effect of rotor iron saturation. Characteristic curves depicting nondimensional expressions developed for the rotor impedance factor and the power factor enable a visualization of the effects of 1) ratio of depth of saliency to depth of penetration, 2) slit number and depth, and 3) effective resistivities and saturation flux densities of different regions of the rotor on rotor parameter variations. Further predicted values are compared with experimental values and conclusions are drawn. View full abstract»

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  • Improved Three Subaperture Method for Elevation Angle Estimation

    Page(s): 114 - 122
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    The three subaperture method is a technique for estimating the arrival angles of two targets located in the main beam of a radar. The problem of estimating the arrival angle of a target in the presence of multipath is considered, and it is shown how the accuracy of the three subaperture method can be improved by making use of the information that the amplitude of the direct ray is larger than that of the reflected ray. View full abstract»

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  • An Algebraic Approach to Superresolution Array Processing

    Page(s): 123 - 133
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    In a recent paper we made an algebraic characterization of the problem of resolving closely spaced plane waves incident on a linear array. The characterization encompassing several superresolution processing methods and encompassed the Wiener, maximum likelihood, and Pisarenko methods as well as suggesting new procedures. In this paper we amplify the algebraic approach and extend the results to consider correlated noise. An adaptive algorithm is given for a particularly effective processing method. View full abstract»

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  • Estimating the Angles of Arrival of Multiple Plane Waves

    Page(s): 134 - 139
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    The problem of estimating the angles of arrival of M plane waves incident simultaneously on a line array with L + 1 (L¿M) sensors utilizing the special eigenstructure of the covariance matrix C of the signal plus noise at the output of the array is addressed. A polynomial D(z) with special properties is constructed from the eigenvectors of C, the zeros of which give estimates of the angle of arrival. Although the procedure turns out to be essentially the same as that developed by Reddi, the development presented here provides insight into the estimation problem. View full abstract»

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  • Radiowave Receiving System Intercept Probability Model

    Page(s): 140 - 146
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    A model is presented for estimating the intercept probabilities of radiowave-acquisition receiving systems. The specific architecture of each of the receiving systems is not important, but there must be two or more of them and they must operate in such a manner that for each trial (event) they alarm independently from a statistical point of view. The data giving the number of alarms for each receiver and the number of receivers alarming for each trial is all that is required. These data are used to form estimates of the conditional probabilities of intercept and simultaneous alarm. A least mean square estimator is then used to find the unconditional intercept probabilities. View full abstract»

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  • F-16 Pulse Doppler Radar (AN/APG-66) Performance

    Page(s): 147 - 158
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    The AN/APG-66 is a digital, multimode, fire control radar that is the primary sensor for the F-16 air combat fighter. The detection and false alarm performance of this radar are described when it operates in its medium PRF pulse Doppler downlook mode. Descriptions are included of medium PRF clutter, the AN/APG-66 signal processing, the flight tests used to obtain performance data, a computer simulation of the radar, and the calibration of the simulation. The detection performance presented is based on both flight tests and the output of the flight test calibrated simulation. The false alarm performance is based on flight tests and is accompanied by a discussion of the sources of false alarms. View full abstract»

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  • IEEE copyright form

    Page(s): 158-a - 158-b
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    Freely Available from IEEE

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