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IEEE Transactions on Aerospace and Electronic Systems

Issue 1 • Date Jan 1992

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Displaying Results 1 - 25 of 28
  • Error estimation of INS ground alignment through observability analysis

    Publication Year: 1992, Page(s):92 - 97
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A systematic analysis of the observability of an inertial navigation system (INS) in ground alignment with Bar-Itzhack and Berman's error model is presented. It is shown that the unobservable states are separately contained in two decoupled subspaces. The constraints on the selection of unobservable states are discussed. An estimation algorithm which is derived fully from the horizontal velocity o... View full abstract»

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  • Detumbling and reorientation maneuvers and stabilization of NASA SCOLE system

    Publication Year: 1992, Page(s):80 - 91
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    The questions of rotational maneuver and vibration stabilization of the NASA Spacecraft Control Laboratory Experiment (SCOLE) system is considered. The mathematical model of the SCOLE system includes the rigid body dynamics as well as the elastic dynamics representing transverse and torsional deformations of the elastic beam connecting the orbiter and end body (reflector). For the rotational maneu... View full abstract»

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  • Direction-of-arrival estimation using signal subspace modeling

    Publication Year: 1992, Page(s):64 - 79
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1220 KB)

    A computationally viable algorithm for estimating the direction-of-arrival (DOA) of multiple wavefields that are incident on an array of sensors is developed. The geometry of the array is unrestricted and the incident wavefields may be generated by mixtures of incoherent and coherent emitting sources. In the approach taken, the sensor signals are modeled as a noise-contaminated linear combination ... View full abstract»

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  • An adaptive array detector with mismatched signal rejection

    Publication Year: 1992, Page(s):195 - 207
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    An adaptive detection algorithm with a sensibility parameter for rejecting unwanted signals is presented. This algorithm is a simple modification of the generalized likelihood ratio (GLR) detector (or test) for detecting a signal in zero mean Gaussian noise with unknown correlation matrix. Specifically, the adaptive detection algorithm is obtained by introducing an arbitrary positive scalar, which... View full abstract»

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  • SAR/ISAR imaging of a nonuniformly rotating target

    Publication Year: 1992, Page(s):317 - 321
    Cited by:  Papers (17)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The resolution of an SAR/ISAR (synthetic aperture radar/inverse synthetic aperture radar) image of a nonuniformly rotating target can be improved by coherently combining corrected images obtained from small sections of th integration time. Results from data obtained from a ship on the open seal with an S-band radar are presented View full abstract»

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  • Design of a CLOS guidance law via feedback linearization

    Publication Year: 1992, Page(s):51 - 63
    Cited by:  Papers (57)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    An application of the feedback linearization technique to the design of a new command to line-of-sight (CLOS) guidance law for short-range surface-to-air missiles is described. The key idea lies in converting the three-dimensional CLOS guidance problem to the tracking problem of a time-varying nonlinear system. The result may shed new light on the role of the feedforward acceleration terms used in... View full abstract»

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  • A new approach to automatic target recognition

    Publication Year: 1992, Page(s):105 - 114
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (900 KB)

    The fundamental problems of automatic target recognition (ATR) are discussed. A new approach to ATR is suggested that includes: a new method of scoring ATR performance, a new concept of artificial images, a new method called probing for extracting target signature knowledge from image experts, and suggestions for coping with the problem of insufficient test data and algorithm obsolescence View full abstract»

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  • Low-altitude target detection by coastline operated marine radar

    Publication Year: 1992, Page(s):217 - 223
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Relevant to a Richian family of fluctuating targets with a composite background of sea-plus-land clutter, the performance prediction of a radar operating in near-coastal regions is elucidated by assuming noncoherent integration of the pulses. Considering the dominance of land clutter, a modified K-distributed statistic is indicated for the overall clutter envelope; and the corresponding p... View full abstract»

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  • Computation of aircraft geometric height under radar surveillance

    Publication Year: 1992, Page(s):241 - 248
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    A radar system for geometric height estimation of civil aircraft is described. The system consists of one standard or mode S secondary surveillance radar (SSR) and one omnidirectional antenna sited away from SSR under an airplane. The geometric height is derived by trilateration. Systematic errors are compensated for by deriving the profile of the effect on height measurements of the bias in range... View full abstract»

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  • Calibration of complex polarimetric SAR imagery using backscatter correlations

    Publication Year: 1992, Page(s):183 - 194
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A technique for calibration of multipolarization synthetic-aperture radar (SAR) imagery is described. If scatterer reciprocity and lack of correlation between co- and cross-polarized radar echoes (for azimuthally symmetric distributed targets) are assumed, the effects of signal leakage between the radar data channels can be removed without the use of known ground targets. If known targets are avai... View full abstract»

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  • MLS system error model identification and synthesis

    Publication Year: 1992, Page(s):164 - 173
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    Signal-in-space modeling of approach and landing guidance systems such as the microwave landing system (MLS), which is necessary for aircraft certification, is addressed. A technique which can, in principle, identify the error sources in navigation systems and can also perform the inverse operation of synthesizing an error generator whose output is statistically equivalent to the original error da... View full abstract»

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  • Biparametric linear estimation for CFAR against Weibull clutter

    Publication Year: 1992, Page(s):138 - 151
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1092 KB)

    The authors deal with constant false alarm rate (CFAR) procedures against nonstationary clutter, modeled as a Weibull distributed process whose scale parameter α and shape parameter β are both variable. It is shown that conventional CFAR procedures, which compensate only for α, degrade intolerably as β deviates from β=2, namely, as the Rayleigh distributional assumption ... View full abstract»

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  • Receiver characteristics of laser altimeters with avalanche photodiodes

    Publication Year: 1992, Page(s):268 - 275
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The receiver characteristics of a laser altimeter system containing an avalanche photodiode photodetector are analyzed using the Gaussian approximation, the saddlepoint approximation, and a nearly exact analysis. The last two methods are shown to yield very similar results except when the background noise is extremely low and the probability of false alarm is high. However, the Gaussian approximat... View full abstract»

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  • Graceful degradation of an adaptive beamforming processor

    Publication Year: 1992, Page(s):305 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    The phase and amplitude weights of each element in an adaptive, digitally beamformed array antenna can be calculated by a systolic parallel processor. The authors propose that the entire weight calculation (both QR decomposition, previously discussed by W.M. Gentleman and H.T. Kung (1981), and the back-substitutions, which are presented for the first time) be performed in a triangular arr... View full abstract»

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  • Analysis and design of parallel resonant convertor at high Q L

    Publication Year: 1992, Page(s):35 - 50
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    A parallel resonant convertor (PRC) operating in the continuous conduction mode (CCM) is analyzed, using a high loaded quality factor QL assumption (i.e., QL>2.5) and Fourier series techniques. Simple analytical expressions for performance characteristics are derived under steady-state conditions for use in designing and understanding the behavior of the ... View full abstract»

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  • General forms and properties of zero cross-correlation radar waveforms

    Publication Year: 1992, Page(s):98 - 104
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    General forms for both the complementary and noncomplementary zero cross-correlation waveform sets are developed. Various properties of these codes and their relationship to zero sidelobe periodic codes are stated and proved. Some radar applications and practical considerations of using these codes are briefly discussed View full abstract»

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  • A CFAR adaptive matched filter detector

    Publication Year: 1992, Page(s):208 - 216
    Cited by:  Papers (563)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An adaptive algorithm for radar target detection using an antenna array is proposed. The detector is derived in a manner similar to that of the generalized likelihood-ratio test (GLRT) but contains a simplified test statistic that is a limiting case of the GLRT detector. This simplified detector is analyzed for performance to signals on boresight, as well as when the signal direction is misaligned... View full abstract»

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  • A noncoherent adaptive detection technique

    Publication Year: 1992, Page(s):115 - 124
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    An adaptive detection technique suitable for both stationary and nonstationary noise environments based upon a generalized likelihood ratio test (GLRT) formulation is presented. The detector, which is statistically equivalent to a special form of the Wilks's lambda test, noncoherently combines the information contained in a pulse train of arbitrary length for decision-making purposes. The probabil... View full abstract»

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  • Observability, ensemble averaging and GPS time

    Publication Year: 1992, Page(s):224 - 240
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    Obtaining time from an ensemble of clocks with a Kalman filter when the system is not observable is examined. Particular attention is given to the Global Positioning System (GPS) master control station (MCS) Kalman filter and the ramifications of estimating ensemble time under conditions of unobservability are explored. The effect of one proposed workaround to problems caused by unobservability is... View full abstract»

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  • Analysis and design of series-parallel resonant power supply

    Publication Year: 1992, Page(s):249 - 258
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A modified series-parallel high-frequency resonant DC/DC converter configuration is proposed. A simplified steady-state analysis of the converter, including the effect of a high-frequency transformer using complex circuit analysis, is presented. Based on the analysis, a simple design procedure is given. The effect of magnetizing inductances of the high-frequency transformer on the performance of t... View full abstract»

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  • Constant-speed target tracking via bearings-only measurements

    Publication Year: 1992, Page(s):174 - 182
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    The observability properties of the constant-speed target tracking problem via bearings-only measurements are investigated. It is shown that there exists a one-dimensional unobservable foliation which is computed. Explicit formulas are given to recover the observable part. It is shown that the direction of target trajectory is observable and that the whole state is observable if either the norm of... View full abstract»

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  • A parallel square-root algorithm for modified extended Kalman filter

    Publication Year: 1992, Page(s):153 - 163
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    A parallel square-root algorithm and its systolic array implementation are proposed for performing modified extended Kalman filtering (MEKF). The proposed parallel square-root algorithm is designed based on the singular value decomposition (SVD) and the Faddeev algorithm, and a very large scale integration (VLSI) systolic array architecture is developed for its implementation. Compared to other sq... View full abstract»

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  • CFAR data fusion center with inhomogeneous receivers

    Publication Year: 1992, Page(s):276 - 285
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Detection systems with distributed sensors and data fusion are increasingly used by surveillance systems. A system formed by N inhomogeneous constant false alarm rate (CFAR) detectors (cell-averaging (CA) and ordered statistic (OS) CFAR detectors) is studied. A recursive formulation of an algorithm that permits a fixed level of false alarms in the data fusion center is presented, to set t... View full abstract»

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  • New maximum entropy spectrum using uncertain eigenstructure constraints

    Publication Year: 1992, Page(s):2 - 14
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    A number of modern spectral estimators are shown to have a common generic formulation. These include minimum variance, MUSIC, and maximum entropy. A new maximum entropy spectral estimator is derived using constraints on the modal powers or the expected-square projections of the data onto the eigenvectors of the data covariance matrix. The formulation incorporates uncertainty in the modal power con... View full abstract»

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  • Impulse radar evaluation of asphalt-covered bridge decks

    Publication Year: 1992, Page(s):125 - 137
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The use of impulse radar to distinguish between areas of good bridge deck and areas which suffer from one or more different forms of deterioration, including delamination, scaling, and debonding, is reported. The radar signal is also used to measure the thickness of asphalt and concrete cover over reinforcement. These quantities are important in determining the amount of material to be removed whe... 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