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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Date Apr 1992

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Displaying Results 1 - 25 of 29
  • Variable time delay estimation in colored and correlated noise environment

    Publication Year: 1992, Page(s):597 - 604
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    A new iterative algorithm for variable time delay estimation (TDE) is presented. The algorithm is based on a system model where two received signals of the form r1(i)=s (i)+n1(i) and r2(i)=s(i-D( i))+n2(i) are used to estimate the... View full abstract»

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  • Statistical estimation of navigation errors

    Publication Year: 1992, Page(s):428 - 438
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    An algorithm for estimating navigation system accuracy without the use of so-called ground truth data is presented. The estimates are expressed in terms of system covariance matrices and relative bias vectors; if one of the systems is a dead-reckoning (DR) or inertial system, the algorithm also estimates drift rate parameters. A summary of tests with US Navy ships backs up the results of Monte Car... View full abstract»

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  • Quantization noise spectrum and radar MTI processing

    Publication Year: 1992, Page(s):588 - 596
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    The power density spectrum of analog-to-digital (A/D) converter quantization noise is obtained for pulsed and sampled CW radars. While this type of noise is often assumed to be uncorrelated or `white', it may not be when a small number of quantization levels are occupied by the input signal or the sampling rate (pulse repetition rate) is large compared with the input clutter spectrum bandwidth. Th... View full abstract»

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  • CFAR for homogeneous part of high-resolution imagery

    Publication Year: 1992, Page(s):370 - 382
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    In high-resolution imaging, weak target pixel amplifiers may not be detected in the presence of clutter containing strong nonhomogeneities, when conventional approaches are used. The authors describe a constant false alarm rate (CFAR) approach that avoids the elimination of these significant target returns. The nonhomogeneous clutter as well as the weak target components are detected with this app... View full abstract»

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  • A new and robust CFAR detection algorithm

    Publication Year: 1992, Page(s):420 - 427
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    A constant false alarm rate (CFAR) detection method which is based on a combination of median and morphological filters (MEMO) is proposed. The MEMO algorithm has robust performance with small CFAR loss, very good behavior at clutter edges and high detection performance in the case of closely spaced narrowband signals (targets). The proposed MEMO method is favourably compared with cell averaging (... View full abstract»

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  • Direction finding using spatial smoothing with interpolated arrays

    Publication Year: 1992, Page(s):574 - 587
    Cited by:  Papers (91)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    The problem of estimating the directions of arrival (DOAs) of signals, some of which may be perfectly correlated, is considered. A computationally efficient estimation algorithm which combines the ideas of spatial smoothing and array interpolation is derived. In one of its forms the proposed algorithm uses the root-MUSIC (root multiple signal classification) technique to compute the DOA estimates,... View full abstract»

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  • Performance analysis of a radar target discrimination technique

    Publication Year: 1992, Page(s):363 - 369
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The performance of a radar target discrimination technique using multiple-frequency scattering amplitude without phase data is investigated. Based on the concept of natural resonance frequencies, the technique is aspect independent so that a priori information of the aspect angle is not necessary. The radar cross sections (RCSs) of spheroids are calculated numerically to simulate the received rada... View full abstract»

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  • Rate-constrained target detection

    Publication Year: 1992, Page(s):491 - 504
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    Given little or no a priori information, a real world detection system has the task of allocating limited resources. Often these resources are themselves detection systems that operate at a slower rate, for example a tracker following a radar. Detection systems that are described by serial multiple decision points with each decision device assumed to be more reliable but slower than the device pre... View full abstract»

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  • Dynamic commutation voltages in a reciprocating linear inductor alternator

    Publication Year: 1992, Page(s):413 - 419
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The waveform of the induced voltages in linear inductor alternators is quite different from that of rotary machines. From the study of the waveform, a dynamic commutation problem is identified. A general method for the analysis of this dynamic behavior is presented. Two techniques to handle this problem are discussed and illustrated by means of a simple model View full abstract»

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  • Modeling and performance of HF/OTH radar target classification systems

    Publication Year: 1992, Page(s):396 - 403
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The effects of a class of multipath propagation channels on the performance of a over-the-horizon (OTH) radar target classification system are considered. A Rician frequency-selective fading channel model is employed to characterize the effects of the multipath propagation medium and evaluate the performance of radar target classification systems. The performance of classification algorithms that ... View full abstract»

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  • Frequency diversity in millimeter wave satellite communications

    Publication Year: 1992, Page(s):567 - 573
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    Dual-band frequency diversity seems to be an effective fade countermeasure to rain-induced attenuation in satellite communications above 20 GHz. This method, particularly suited for satellites operating in two frequency bands, typically Ka band and C or Ku band, achieves very low levels of outage probability especially where the rain fades are seve... View full abstract»

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  • Performance of phased-array antennas with mechanical errors

    Publication Year: 1992, Page(s):535 - 545
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The performance of planar phase-array antennas with mechanical errors is investigated. Errors in array element positions as a result of structural distortions are considered as deterministic and predictable. Detailed calculations for two assumed modes of distortion reveal that their effects on antenna performance are the loss of peak response in the scan direction and the broadening of the mainlob... View full abstract»

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  • A class of pseudonoise-like pulse compression codes

    Publication Year: 1992, Page(s):355 - 362
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The authors describe a class of pulse compression waveform designs suitable for applications requiring low peak power, large duty factors, and large compression ratios. The waveforms are closely related to those derived from pseudonoise (PN) sequences, and exhibit many of the same properties. However, they exist in code lengths for which PN sequences cannot be constructed and offer the user greate... View full abstract»

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  • Improved strapdown coning algorithms

    Publication Year: 1992, Page(s):484 - 490
    Cited by:  Papers (33)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Three improved algorithms for strapdown attitude computation utilizing accumulated gyro increments from the previous and current update are developed and evaluated analytically under classical coning motion. The error criterion of Miller is derived directly from the rotation vector concept. The accuracy of updating rotation vector estimation can be improved at least two orders of magnitude as comp... View full abstract»

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  • Electrostatic suspension system with sliding mode control

    Publication Year: 1992, Page(s):605 - 609
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Two aspects must be considered in selecting the preload of electrostatic suspension system (ESS) for the electrostatic gyroscope (ESG), both the required load capacity and the tolerable electrical disturbing torques exerted on the rotor. By means of sliding mode control (SMC), ESS may operate in three modes: (1) two-sided linear suspension (2) single-sided nonlinear suspension, and (3) single-side... View full abstract»

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  • Incremental maneuver estimation model for target tracking

    Publication Year: 1992, Page(s):439 - 452
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    An incremental model for maneuver detection and estimation for use in target tracking with the Kalman filter is described. The approach is similar to the multiple Kalman filter bank, but with a memory for the maneuver status for the track under consideration. The advantage of this approach is that the target acceleration can be more accurately estimated. The maneuver-detection model has shown good... View full abstract»

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  • Two-valued sequences with perfect periodic autocorrelation

    Publication Year: 1992, Page(s):383 - 386
    Cited by:  Papers (34)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Periodic two-valued signals which exhibit two-level autocorrelation can, in many cases, be made to yield an out-of-phase autocorrelation value identically equal to zero. This can be achieved by replacing the two values of the sequence (normally +1 and -1) with the two values +1 and e, or with +1 and β (β real). Simple expression for φ and β are given, b... View full abstract»

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  • A selection and estimation test for multiple target detection

    Publication Year: 1992, Page(s):509 - 519
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    The authors apply a selection and estimation procedure for the detection of multiple targets in clutter. The selection and estimation (SE) test performs better than a fixed order statistic (OS) detector. The SE test has some similarity to a variable trimmed mean (VTM) test and has a slight performance advantage. Unlike the VTM, whose performance is evaluated only by simulation studies, the perform... View full abstract»

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  • Temporal decorrelation of X-band backscatter from wind-influenced vegetation

    Publication Year: 1992, Page(s):404 - 412
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The temporal decorrelation characteristics of X-band radar backscatter from wind-influenced vegetation were investigated using a short-range CW radar. Radar reflectance data were gathered on various types of individual trees from a distance of approximately 30 m. The windspeed was monitored during each measurement, which lasted 5 s. The crown cover and the mean leaf area of the trees were... View full abstract»

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  • Tracking multitarget in cluttered environment

    Publication Year: 1992, Page(s):546 - 559
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    A method for multitarget tracking and initiating tracking in a cluttered environment is proposed. The algorithm uses a sliding window of length uT (T is the sampling time) to keep the measurement sequence at time k. Instead of solving a large problem, the entire set of targets and measurements is divided into several clusters so that a number of smaller problems are solv... View full abstract»

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  • An optimal reduced-order stochastic observer-estimator

    Publication Year: 1992, Page(s):453 - 461
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    An optimal reduced-order observer-estimator (filter) is developed which can provide a full-dimensional vector of state estimates for systems where the dimension of the measurement vector is smaller than that of the state vector and none of the measurements are noise free. The reduced-order filter consists of two subfilters each of which provides a subset of the optimal estimate. A two-step ... View full abstract»

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  • Periodic ambiguity function of CW signals with perfect periodic autocorrelation

    Publication Year: 1992, Page(s):387 - 395
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    A periodic ambiguity function (PAF) is discussed which describes the response of a correlation receiver to a CW signal modulated by a periodic waveform, when the reference signal in the receiver is constructed from an integral number N, of periods T, of the transmitted signal. The PAF is a generalization of the periodic autocorrelation function, to the case of non-zero Doppler sh... View full abstract»

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  • Improving ESPRIT via beamforming

    Publication Year: 1992, Page(s):520 - 528
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Beamforming techniques are presented that improve the performance of the ESPRIT (estimation of signal parameters via rotational invariance techniques) algorithm for solving the narrowband multiple source location problem with uniform linear arrays. Using ESPRIT with these beamforming approaches maintains the computational advantage of the original ESPRIT while further exploiting the special struct... View full abstract»

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  • Application of Gram-Schmidt algorithm to fully adaptive arrays

    Publication Year: 1992, Page(s):324 - 334
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The Gram-Schmidt orthogonalization (GSO) algorithm has excellent numerical performance and is readily applicable to systolic implementations such as in a field of adaptive cancellation systems. A modified GSO algorithm for a fully adaptive array is proposed and computer simulations show that the proposed algorithm gives superior performance. A systolic implementation of the proposed GSO algorithm ... View full abstract»

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  • A maximum likelihood approach to data association

    Publication Year: 1992, Page(s):560 - 566
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    An approach is presented to data association (DA) problems for which measurements are independent from scan to scan. It is demonstrated that maximum likelihood (ML) estimation of target parameters may be efficiently implemented by an EM iterative scheme. The algorithm is applied to multitarget trajectory estimation of constant-velocity targets from passive (bearing-only) sensors 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