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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • Oct. 1992

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Displaying Results 1 - 23 of 23
  • Comments on "Existence and uniqueness of GPS solutions" by J.S. Abel and J.W. Chaffee

    Publication Year: 1992
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (33 KB)

    The commenter points out that a direct Global Positioning System (GPS) algorithm together with discussions on the existence and uniqueness of the solution appeared in his paper (J. Guidance, Control, and Dynamics, vol.9, p.715-17, Nov./Dec. 1986). Since the GPS solution is reduced to solving a quadratic equation, the existence and uniqueness can be easily tested. J.S. Abel and J.W. Chaffee, in the... View full abstract»

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  • Single-phase power distribution system power flow and fault analysis

    Publication Year: 1992, Page(s):1033 - 1041
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    Alternative methods for power flow and fault analysis of single-phase distribution systems are presented. The algorithms for both power flow and fault analysis utilize a generalized approach to network modeling. The generalized admittance matrix, formed using elements of linear graph theory, is an accurate network model for all possible single-phase network configurations. Unlike the standard noda... View full abstract»

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  • Some limitations on the effectiveness of airborne adaptive radar

    Publication Year: 1992, Page(s):1015 - 1032
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1140 KB)

    It is shown that internal clutter motion, aircraft crabbing, scattering from near-field obstacles, and channel mismatch can limit the effectiveness of space-time processing in eliminating airborne clutter. An analytical expression is developed to show how each of these effects produces a deterioration in the signal-to-clutter-plus-noise ratio achievable. By studying the spectral decomposition of t... View full abstract»

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  • Distributed filtering using set models

    Publication Year: 1992, Page(s):1144 - 1153
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    A distributed filtering algorithm using set models with confidence values is derived. No noise distribution statistics are needed. The only information required is the confidence values from which the modeling and measurement errors and the initial values are obtained. Therefore, the algorithm has great potential for real-world applications View full abstract»

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  • A variably trimmed mean CFAR radar detector

    Publication Year: 1992, Page(s):1002 - 1014
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (980 KB)

    A variably trimmed mean (VTM) constant false alarm rate (CFAR) detector in which the threshold is determined by processing a linear combination of a group of ordered samples in each window is introduced. Unlike the trimmed mean detector, the number of ordered samples that require further processing is allowed to vary according to a data-dependent rule. It is demonstrated that the VTM detector exhi... View full abstract»

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  • An efficient method of passive emitter location

    Publication Year: 1992, Page(s):1091 - 1104
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    The problem of locating a stationary emitter from passive bearing and frequency measurements taken by a moving and autonomously operating sensor along its trajectory is considered. The estimation procedure based on bearings only is quite different from that based on frequency measurements. From the Cramer-Rao (CR) analysis of the single-measurement case, the characteristic features of each method ... View full abstract»

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  • Reduction of aliasing ambiguities through phase relations

    Publication Year: 1992, Page(s):950 - 956
    Cited by:  Papers (13)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A method for digital determination of a single frequency from a sine wave sampled at less than the Nyquist rate is discussed. The method makes use of phase shift information to eliminate the aliasing ambiguity. Multiple sampled data are required to eliminate ambiguity completely. Computer modeling using simulated data corrupted by uncorrelated Gaussian noise was used to verify the approach. The re... View full abstract»

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  • Detection in correlated Gaussian plus impulsive noise

    Publication Year: 1992, Page(s):932 - 943
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    A detector which is designed to operate in a correlated Gaussian-plus-impulsive-noise environment is presented. The detector whitens the data robustly and then uses a two-sided threshold test to determine the presence of impulsive samples. The impulsive samples are discarded, and the remaining samples are used to detect the presence or absence of a signal using a matched filter. An approximate ana... View full abstract»

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  • Systolic array implementation of second-order Kalman filter

    Publication Year: 1992, Page(s):1128 - 1143
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    The approach for design of parallel implementation of the second-order Kalman filter using systolic array processors is proposed. The original time complexity of more than 27n3 for sequential processing can be reduced to only 21n+10r-4 in the proposed parallel implementation. The improvement is gained from the utilization of interarray pipelining, concurrent p... View full abstract»

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  • On-board multibeam deployable antennas using Ka, C, andS frequency bands

    Publication Year: 1992, Page(s):990 - 1001
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    The configuration, on-ground tests, and design verification results for the multibeam antenna flight model for Engineering Test Satellite-VI (ETS-VI) are described for onboard multibeam antennas with thirteen and five beams for the Ka- and S-bands, respectively. The antennas feature Ka-band frequency reuse in alternate beams through use of a cluster horn; shared use of a... View full abstract»

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  • Sequential localization of a radiating source by Doppler-shifted frequency measurements

    Publication Year: 1992, Page(s):1084 - 1090
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    For a single omnidirectional sensor in contact with a constant velocity source that radiates a constant frequency tone, the measurements of the Doppler-shifted frequencies over time do not provide sufficient information to localize the source. Instead, only the parameters of source rest frequency, speed, and range relative to a sensor can be determined. However, if over time three or more sensors ... View full abstract»

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  • Analysis of a parallel resonant converter with secondary-side resonance

    Publication Year: 1992, Page(s):1042 - 1055
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    A high-frequency (HF) link parallel resonant DC/DC converter operating in the lagging power factor mode with the resonating capacitor on the secondary side of the HF transformer is analyzed using a state-space approach. Closed-form solutions (except for the duration of diode conduction) are obtained for steady-state conditions, and design curves are obtained. A method of obtaining optimum operatin... View full abstract»

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  • Propagation results of aeronautical satellite communication experiments using INMARSAT satellite

    Publication Year: 1992, Page(s):1155 - 1157
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Aeronautical satellite communication experiments were conducted using a top-mounted high-gain antenna of the phased-array type. Slow fading of 3 to 4 dB in the L-band channel was observed when the wing direction coincides with the satellite direction, in contrast with the small fading observed in the cases where the aircraft wing is out of the beam pointing to the satellite View full abstract»

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  • Jump detection/estimation using stepwise regression

    Publication Year: 1992, Page(s):1105 - 1118
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    The detection and estimation of jumps with unknown time and magnitude in specific states of a dynamic process is addressed. Unlike most of the techniques described in the literature, the method can handle multiple jumps within the data window. This allows the use of longer data spans with consequently improved jump estimation. Jumps are treated as bias states, and the innovations and innovation se... View full abstract»

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  • Application of velocity filtering to optical-flow passive ranging

    Publication Year: 1992, Page(s):957 - 969
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (956 KB)

    The performance of the velocity filtering method as applied to optical-flow passive ranging under real-world conditions is evaluated. The theory of the 3-D Fourier transform as applied to constant-speed moving points is reviewed, and the space-domain shift-and-add algorithm is derived from the general 3-D matched filtering formulation. The constant-speed algorithm is then modified to fit the actua... View full abstract»

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  • Self-calibrating SSR monopulse receiver

    Publication Year: 1992, Page(s):944 - 949
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    An extension of the monopulse technique for estimating the target azimuth in a secondary surveillance radar (SSR) is considered. The idea is to associate in pairs monopulse measurements coming from the amplitude processor (AP) at the dwell time processing level. This allows the automatic compensation of the bias errors due to the misalignments in the receiver channels, thus eliminating the necessi... View full abstract»

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  • Observability analysis of piece-wise constant systems. I. Theory

    Publication Year: 1992, Page(s):1056 - 1067
    Cited by:  Papers (129)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    For pt.II see ibid., vol.28, no.4, p.1068-75, Oct. 1992. A method for analyzing the observability of time-varying linear systems which can be modeled as piece-wise constant systems (PWCS) is presented. An observability matrix for such systems is developed for continuous and discrete time representations. A stripped observability matrix (SOM) is introduced which simplifies the analysis in cases whe... View full abstract»

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  • A simple, low-computation peak detection algorithm for the angle-of-arrival spectrum for signal subspace methods

    Publication Year: 1992, Page(s):1158 - 1163
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The array manifold, which is a collection of array steering vectors associated with k calibrated directions of arrival, is a commonality for the class of signal subspace methods. In actual direction finding (DF) systems, the array manifold (calibration table) is usually generated by measurements in a noisy environment. Subsequently, the resulting angle-of-arrival (AOA) spectrum, correspon... View full abstract»

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  • Analysis of an all-digital data-transition tracking loop

    Publication Year: 1992, Page(s):1119 - 1127
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    An all-digital implementation of the data-transition tracking loop (DTTL) is proposed and analyzed. The input waveform is assumed to be nonreturn-to-zero (NRZ)-coded binary signals. The mathematical analysis of the loop is reduced to the study of a Markov chain which allows the derivation of expressions for the mean square phase error, steady-state probabilities, transient behavior (time to acquir... View full abstract»

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  • Nonlinear observer and output feedback attitude control of spacecraft

    Publication Year: 1992, Page(s):970 - 977
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The problem of controlling a spacecraft by measuring only the angular position (roll, pitch, and yaw) is considered. A nonlinear observer is proposed which asymptotically reconstructs all the spacecraft state variables; if the spacecraft actuators are reaction wheels, the angular velocities of the wheels also must be measured. It is shown that if the observer is used in connection with asymptotica... View full abstract»

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  • Observability analysis of piece-wise constant systems. II. Application to inertial navigation in-flight alignment [military applications]

    Publication Year: 1992, Page(s):1068 - 1075
    Cited by:  Papers (110)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    For pt.I see ibid., vol.28, no.4, p.1056-67, Oct. 1992. The method of analyzing the observability of time-varying linear systems as piecewise constant systems (PWCS) is applied to the analysis of in-flight alignment (IFA) of inertial navigation systems (INS) whose estimability is known to be enhanced by maneuvers. The validity of this approach to the analysis of IFA is proven. The analysis lays th... View full abstract»

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  • Error analysis of combined optical-flow and stereo passive ranging

    Publication Year: 1992, Page(s):978 - 989
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Optical-flow ranging in which the stream of two-dimensional images obtained from a forward-looking forward-moving passive sensor is used to compute range to points in the field of view, and triangulation based on stereo images obtained from at least two stationary sensors are combined. The potential accuracies of the combined optical flow and stereo passive-ranging system are analyzed in the conte... View full abstract»

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  • Bearings-only and Doppler-bearing tracking using instrumental variables

    Publication Year: 1992, Page(s):1076 - 1083
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    In bearings-only tracking (BOT) or Doppler and bearing tracking (DBT), both common passive sonar problems, the measurement equations are nonlinear. To apply the Kalman filter, it is necessary either to linearize the equations or to embed the nonlinearities into the noise terms. The former sometimes leads to filter divergence, while the latter produces biased estimates. A formulation of BOT and DBT... 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