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Aerospace and Electronic Systems, IEEE Transactions on

Issue 2 • Date March 1981

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Displaying Results 1 - 25 of 34
  • Table of contents

    Publication Year: 1981 , Page(s): c1
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  • IEEE Aerospace and Electronic Systems Society

    Publication Year: 1981 , Page(s): c2 - [320]-b
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  • From the Editors

    Publication Year: 1981 , Page(s): 161
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  • Observability Criteria for Bearings-Only Target Motion Analysis

    Publication Year: 1981 , Page(s): 162 - 166
    Cited by:  Papers (110)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1365 KB)  

    The observability requirements for bearings-only target motion analysis (TMA) are rigorously established by solving a third-order nonlinear differential equation. Closed form expressions are developed and subsequently used to specify necessary and sufficient conditions on own-ship motion that insure a uniquetracking solution. It is shown that for certain types of maneuvers the estimation process r... View full abstract»

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  • Optical Calibration of Geostationary Satellite Tracking Systems

    Publication Year: 1981 , Page(s): 167 - 172
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2553 KB)  

    A precise calibration method for range and angle observation has been developed for eliminating the systematic error of tracking systems, thus improving the accuracy of orbit determination for geostationary satellites. The principle of calibration is based on an orbit determination employing a point of optical angle observation in addition to radio tracking observation, in which we estimate observ... View full abstract»

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  • An Adaptive Extended Kalman Filter for Target Image Tracking

    Publication Year: 1981 , Page(s): 173 - 180
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2073 KB)  

    A simple extended Kalman filter has been designed to track targets using outputs from a forward-looking infrared (FLIR) sensor as measurements. It exploits knowledge unused by current correlation trackers ¿ size, shape, and motion characteristics of target, and atmospheric jitter spectral description ¿ to yield enhanced performance. In order to track air-to-air missiles at close range, it incorp... View full abstract»

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  • Cross Noise in Multi-Output DC-to-DC Converters

    Publication Year: 1981 , Page(s): 181 - 189
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1746 KB)  

    In a multi-output dc-to-dc converter with cross regulation, the noise generated in one of the multiple loads is transmitted to the other loads. It is called ¿cross noise.¿ This cross noise is analyzed and experimental results are given. High-frequency equivalent circuits, which are composed of parasitic parameters and have several parallel and series resonances, are presented for cross noise in ... View full abstract»

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  • A Normalized Model for the Half-Bridge Series Resonant Converter

    Publication Year: 1981 , Page(s): 190 - 198
    Cited by:  Papers (63)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2473 KB)  

    Closed-form steady-state equations are derived for the halfbridge series resonant converter with a rectified (dc) load. Normalized curves for various currents and voltages are then plotted as a function of the circuit parameters. Experimental results based on a 10-kHz converter are presented for comparison with the calculations. View full abstract»

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  • Cross-Correlation Interference Effects in Multiaccess Optical Communications

    Publication Year: 1981 , Page(s): 199 - 207
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2106 KB)  

    The effects of the cross correlation between user codes in an opticalcode-division multiple-access communication system are investigated. The system model is a multiaccess satellite repeater in which the uplink and downlink channels are direct-detection, optical-polarization modulation links. The error probability is derived in terms of the cross correlation between the intended and interfering us... View full abstract»

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  • Stability of Gyro in a Vehicle Spinning with Uncertain Angular Velocity

    Publication Year: 1981 , Page(s): 208 - 212
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (883 KB)  

    The analysis of a single-axis rate gyroscope mounted in a vehicle which is spinning with uncertain angular velocity about the spin axis of the gyro is presented. The nonlinearity in the equation of motion of the gimbal is retained. Using circle criterion, it is shown that the gimbal motion is globally asymptotically stable if Nyquist plot of the linear transfer function of the gyro lies in the int... View full abstract»

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  • Maximum Likelihood Elevation Angle Estimates of Radar Targets Using Subapertures

    Publication Year: 1981 , Page(s): 213 - 221
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1874 KB)  

    The maximum likelihood estimates of the elevation angles of two closely spaced targets within the beamwidth is considered. For an array divided into three subapertures, a simple, closed form solution is found whose accuracy compares favorably to the maximum likelihood estimate which uses all the individual elements. Simulation results are presented for the case of a radar target located over a smo... View full abstract»

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  • The Effect of Differential Time Delays in the LMS Feedback Loop

    Publication Year: 1981 , Page(s): 222 - 228
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1400 KB)  

    The effect of differential time delay in the feedback loops of an LMS adaptive array is examined. Differential time delay is shown to have two effects on array performance. First, it causes the weights to oscillate during weight transients. Second, it degrades the output signal-to-interference-plus-noise ratio (SINR) from the array. Weight oscillation occurs when the phase shifts in the LMS loop a... View full abstract»

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  • Three Mile Island - Lessons for America

    Publication Year: 1981 , Page(s): 229 - 233
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1857 KB)  

    The great fear of a nuclear castastrophe is the prime lesson learned from the Three Mile Island accident. This fear is real and creates a major risk to our society. Although the probability of a major release of radioactivity occurring at a given plant in a given year is low, the rapidly increasin number of plants around the world increases the probability that such a catastrophe will occur somepl... View full abstract»

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  • Adaptive Arrays Can Be Used to Separate Communication Signals

    Publication Year: 1981 , Page(s): 234 - 247
    Cited by:  Papers (11)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1916 KB)  

    Using eigentheory, it is shown how up to n unknown independent narrowband signals arriving from different directions at an array of n antenna elements can be separated into n channels where each channel contains primarily one signal. An expression for the signal-to-interference ratio (SIR) on eachoutput channel is determined analytically and evaluated for many illustrative cases. The results show ... View full abstract»

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  • Accuracy of Noise-Modulated Radio Altimeter

    Publication Year: 1981 , Page(s): 248 - 253
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1252 KB)  

    The principle of operation of a noise-modulated radio altimeter is based on the dependence of the cross-correlation function of the random modulation (Gaussian noise) of the finite correlatorbandwidth, the smoothing time, the influence of extraneous noise disturbance, and the change of the altitude of the aircraft during measurement. An optimum value of integration time is found that minimizes the... View full abstract»

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  • Estimation of Aircraft Target Motion Using Orientation Measurements

    Publication Year: 1981 , Page(s): 254 - 260
    Cited by:  Papers (49)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2138 KB)  

    A new approach to estimating motion of a highly maneuverable aircraft target in an air-to-air tracking scenario is presented. An interactive filter system is developed that provides an improved estimate of target motion states by conditioning kinematic filter estimates on target aspect angle data. Pattern recognition techniques used with an electrooptical tracker are presumed to provide this targe... View full abstract»

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  • Application of Endfire Arrays at Contemporary Glide-Slope Problem Sites

    Publication Year: 1981 , Page(s): 261 - 270
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (3597 KB)  

    The application of the endfire-type, compatible instrument landing system (ILS) glide slope is discussed in the context of providing increased capability to install facilities without requirements for extensive terrain modification. Costs of preparing a site for glide-slope operation can be reduced many times by eliminating the requirement for the usual image-forming ground plane. An example is gi... View full abstract»

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  • Detection of Target Multiplicity Using Monopulse Quadrature Angle

    Publication Year: 1981 , Page(s): 271 - 280
    Cited by:  Papers (18)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1955 KB)  

    The feasibility of using the indicated quadrature angle of arrival of a monopulse radar to discriminate a single target from multiple targets, separated in angle within a radar resolution cell, is investigated. The analysis is performed for steady (fixed) and Rayleigh fluctuating targets which cover a broad range of target characteristics. In both cases, the interfering signals due to noise and cl... View full abstract»

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  • Orientation of Measurement Sensors for Optimum End-of-Life Performance

    Publication Year: 1981 , Page(s): 281 - 287
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1672 KB)  

    Relative orientations of on-board measurement sensors are found that ensure the best possible measurement accuracy in the end-of-life situation when all but three sensors have failed. For five and six sensors, the optimum orientations are, respectively, the single cone and dodecahedron configurations. For seven and eight sensors, new configurations are found that are, respectively, 25 and 20 perce... View full abstract»

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  • Sampling Bandpass Signals

    Publication Year: 1981 , Page(s): 288 - 295
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1646 KB)  

    In a recent paper [1], Brown examined the sampling of a real finiteenergy bandpass signal having an (angular) bandwidth ¿ (in radians per second) at the theoretically minimum (average) rate of ¿/¿ samples per second. Following Grace and Pitt's [2] quadrature sampling, a particular case of Kohlenberg's second-order sampling [3, 4], Brown has proved the feasibility of a separate interpolation of ... View full abstract»

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  • IEEE AES - An Invitation

    Publication Year: 1981 , Page(s): 296
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    Freely Available from IEEE
  • Radar Noise Jamming Calculations Simplified

    Publication Year: 1981 , Page(s): 297 - 300
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (497 KB)  

    The ratio of radar jamming noise power to radar thermal noise power (J/N) is examined in a multiple noise jammer environment where jammer distances and energy levels vary. A simpler form of the computation of J/N is shown for several practical multiple noise jammer configurations. View full abstract»

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  • Comments on Transmission System Using Pseudonoise Modulation of Linear Chirps

    Publication Year: 1981 , Page(s): 300 - 303
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1308 KB)  

    The combination of phase shift keying (PSK) with different chirp waveforms is investigated in respect to its signal form and spectrum shape. A reasonable compromise for low probability of exploitation and jam sensitivity is found for a system where the chirp bandwidth is in the vicinity of the bitrate of the pseudonoise code. View full abstract»

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  • Code Division Multiplexing by Frequency Shifted Biphase Modulated M-Sequences

    Publication Year: 1981 , Page(s): 303 - 304
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (253 KB)  

    A new set of frequency shifted biphase modulated PN sequence signals is introduced, and it is shown that for a set of length N the cross mutual interference is bounded by (N + 1)/N2. This subject is related to the so-called near/far problem of directsequence encoded code division multiplexing networks. View full abstract»

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  • A Simple Formula for Radar Detection Probability on Swerling I Targets

    Publication Year: 1981 , Page(s): 304 - 305
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (275 KB)  

    A formula is presented for the detection probability on a single scan of a Swerling I target. The formula does not use the Gaussian probability function and is accurate to 1.5 dB for the integration between 10 to 1000 pulses and for false alarm probabilities between 0.693 × 10-3 and 0.693 × 10-6. 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