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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • Date Jul 1999

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Displaying Results 1 - 25 of 30
  • On the convergence of iterative methods for bearings-only tracking

    Publication Year: 1999, Page(s):801 - 818
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    This paper deals with the analysis of the convergence of iterative methods for bearings only tracking (BOT). A geometric and unified framework is developed. Explicit sufficient conditions ensuring convergence of iterative methods for maximization of the likelihood functional are then derived View full abstract»

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  • Incoherent radar detection in compound-Gaussian clutter

    Publication Year: 1999, Page(s):790 - 800
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    The detection of incoherent pulse trains in compound-Gaussian disturbance with known spectral density is dealt with here. Two alternative approaches are investigated, The first, assuming perfect knowledge of the signal fluctuation law and implementing the Neyman-Pearson test on the observed waveform, turns out to be not applicable to the radar problem. The second, instead, relying on the generaliz... View full abstract»

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  • Time-varying autoregressive modeling of HRR radar signatures

    Publication Year: 1999, Page(s):974 - 988
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2036 KB)

    A time-varying autoregressive (TVAR) model is used for the modeling and classification of high range resolution (HRR) radar signatures. In this approach, the TVAR coefficients are expanded by a low-order discrete Fourier transform (DFT). A least-squares (LS) estimator of the TVAR model parameters is presented, and the maximum likelihood (ML) approach for determining the model order is also present... View full abstract»

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  • Predetection fusion: resolution cell grid effects

    Publication Year: 1999, Page(s):778 - 789
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    If members of a suite of sensors from which fusion is to be carried out are not colocated, it is unreasonable to assume that they share a common resolution cell grid; this is generally ignored in the data fusion community. We explore the effects of such “noncoincidence”, and we find that what at first seems to be a problem can in fact be exploited. The idea is that a target is known to... View full abstract»

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  • Trajectory deviations in airborne SAR: analysis and compensation

    Publication Year: 1999, Page(s):997 - 1009
    Cited by:  Papers (108)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    This paper concerns the analysis and compensation of trajectory deviations in airborne synthetic aperture radar (SAR) systems. Analysis of the received data spectrum is carried out with respect to the system geometry in the presence of linear, sinusoidal, and general aircraft displacements. This shows that trajectory deviations generally produce spectral replicas along the azimuth frequency that s... View full abstract»

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  • Intelligent control of a planning system for astronaut training

    Publication Year: 1999, Page(s):1055 - 1070
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1512 KB)

    This work intends to design, analyze and solve, from the systems control perspective, a complex, dynamic, and multiconstrained planning system for generating training plans for crew members of the NASA-led International Space Station. Various intelligent planning systems have been developed within the framework of artificial intelligence. These planning systems generally lack a rigorous mathematic... View full abstract»

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  • New results in importance sampling [of false alarm statistics]

    Publication Year: 1999, Page(s):917 - 925
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Importance sampling is a technique which can significantly reduce the number of Monte Carlos necessary to accurately estimate the probability of low-probability of occurrence events (e.g., the probability of false alarm PF associated with a given detection scheme). A new technique called the Chernoff Importance Sampling Method is introduced. It is shown that the number of required Monte... View full abstract»

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  • Generalized radar clutter model

    Publication Year: 1999, Page(s):857 - 865
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A commonly used density model for radar clutter is chi-square for power, or, equivalently, Rayleigh for amplitude. However, for many modern high resolution radar systems, this density underestimates the tails of the measured clutter density. Log normal and Weibull distributions have proved to be better suited for the clutter in these high resolution radars. Generalizing the chi-square density by r... View full abstract»

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  • Pade approximations to matched filter amplitude probability functions

    Publication Year: 1999, Page(s):1033 - 1045
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    Performance analysis of echolocation systems requires the probability density function (pdf) or survival function of a matched filter output. A method is presented to derive approximations to these functions using a Pade approximation to their associated characteristic function (CF). The method is based on the Hankel transform. It allows computation of detection probabilities when the matched filt... View full abstract»

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  • Optimization of observer trajectories for bearings-only target localization

    Publication Year: 1999, Page(s):892 - 902
    Cited by:  Papers (132)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    The problem of bearings-only target localization is to estimate the location of a fixed target from a sequence of noisy bearing measurements. Although, in theory, this process is observable even without an observer maneuver, estimation performance (i.e., accuracy, stability and convergence rate) can be greatly enhanced by properly exploiting observer motion to increase observability. This work add... View full abstract»

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  • An analysis of the shadow feature technique in radar detection

    Publication Year: 1999, Page(s):1104 - 1106
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    Good target detection can be achieved by using shadow feature algorithms, particularly in heavy clutter environments. The performance enhancement of a shadow feature algorithm applied to a maximum likelihood constant false-alarm rate (ML-CFAR) detector is analyzed. Results show that detection performance is significantly improved View full abstract»

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  • Highly accurate, noncoherent technique for spacecraft Doppler tracking

    Publication Year: 1999, Page(s):963 - 973
    Cited by:  Papers (15)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    A two-way, noncoherent spacecraft navigation technique has been developed to provide velocity accuracy comparable to that available from a deep space coherent transponder (0.1 mm/s). The technique is compatible with the normal tracking procedures of the Deep Space Network (DSN) ground stations and does not require the use of a highly stable oscillator on-board the spacecraft. The measurement techn... View full abstract»

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  • UWB radar detection of targets in foliage using alpha-stable clutter models

    Publication Year: 1999, Page(s):819 - 834
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2848 KB)

    We address the problem of detection of targets obscured by a forest canopy using an ultrawideband (UWB) radar. The forest clutter observed in the radar imagery is a highly impulsive random process that is more accurately modeled with the recently proposed class of alpha-stable processes as compared with Gaussian, Weibull, and K-distribution models. With this more accurate model, segmentation is pe... View full abstract»

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  • Development of random signal radars

    Publication Year: 1999, Page(s):770 - 777
    Cited by:  Papers (46)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Development of random signal radar (RSR) over the past 30 years is described. Conventional methods of implementing RSR are summarized such as correlation, spectrum analysis, and anticorrelation. Some typical RSR systems are introduced, for example, noise frequency modulation CW radar, random binary phase-coded CW radar, etc., and their merits and demerits are also pointed out. Finally, RSR develop... View full abstract»

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  • Fast automatic leveling subject to abrupt deterministic input

    Publication Year: 1999, Page(s):989 - 996
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    This investigation applies a modified Kalman filter with a recursive generalized M estimator (GME) of input to a class of leveling problems, that are subject to abrupt environmental disturbances and high noise levels. A least-squares estimator (LSE) based hypothetical testing scheme is also devised to detect the onset and presence of the input. Simulation results demonstrate that the leveling spee... View full abstract»

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  • MMW radar scattering statistics of terrain at near grazing incidence

    Publication Year: 1999, Page(s):1010 - 1018
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    The statistical behavior of clutter observed near grazing incidence and at 95 GHz is investigated for the specific cases of bare ground, snow cover, and for a heterogeneous scene. The bare ground constitutes a homogeneous target under homogeneous conditions and the magnitude of the amplitude is Rayleigh distributed. While the snow cover is a homogeneous target, the conditions under which it was ob... View full abstract»

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  • Enhanced ATM for satellite laser communication networks

    Publication Year: 1999, Page(s):1071 - 1076
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Satellite networks are one of the most emergent areas in commercial communication. Today about twenty serious consortiums (such as Iridium, Teledesic, Globstar, and Celestri) develop satellite communication networks. In the new generation of satellite networks, laser will be used as a communication link between the satellites in order to get wider bandwidth for the network backbone. One of the mai... View full abstract»

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  • Spatially distributed target detection in non-Gaussian clutter

    Publication Year: 1999, Page(s):926 - 934
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Two detection schemes for the detection of a spatially distributed, Doppler-shifted target in non-Gaussian clutter are developed. The non-Gaussian clutter is modeled as a spherically invariant random vector (SIRV) distribution. For the first detector, called the non-scatterer density dependent generalized likelihood ratio test (NSDD-GLRT), the detector takes the form of a sum of logarithms of iden... View full abstract»

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  • Differential positioning experiment using two geostationary satellites

    Publication Year: 1999, Page(s):866 - 878
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    A ranging and positioning system for a ship or an aircraft using two geostationary satellites is described. This system has a ranging and positioning accuracy of 100 m and 1 km. Experiments to estimate this system were performed using a ship in the Pacific Ocean in a normal and a differential modes. This system leads to the development of fundamental ranging and positioning techniques for the coop... View full abstract»

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  • Comparison of SDINS in-flight alignment using equivalent error models

    Publication Year: 1999, Page(s):1046 - 1054
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    The psi-angle model and the equivalent tilt (ET) model have been widely used for in-flight alignment (IFA) to align and to calibrate a strapdown inertial navigation system (SDINS) on a moving base. However, these models are not effective for a system with large attitude errors because the neglected error terms in the models degrade the performance of a designed filter. In this paper, with an odome... View full abstract»

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  • Analysis of an adaptive CFAR detector in non-Gaussian interference

    Publication Year: 1999, Page(s):903 - 916
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    Coherent signal detection in non-Gaussian interference is presently of interest in adaptive array applications. Conventional array detection algorithms inherently model the interference with a multivariate Gaussian random vector. However, non-Gaussian interference models are also under investigation for applications where the Gaussian assumption may not be appropriate. We analyze the performance o... View full abstract»

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  • Wavelet based approach for joint time delay and Doppler stretch measurements

    Publication Year: 1999, Page(s):1111 - 1119
    Cited by:  Papers (19)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    A new wavelet-based algorithm for joint time delay and Doppler stretch estimation in passive radar, sonar, and GPS applications is described. By taking the cross wavelet transform of the noisy outputs from two spatially separated sensors, the wideband cross ambiguity function (WBCAF) can be computed. This in turn provides a direct measurement of the time difference and Doppler stretch between the ... View full abstract»

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  • Improvement of strapdown inertial navigation using PDAF

    Publication Year: 1999, Page(s):835 - 856
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    A new application of PDAF (probabilistic data association filter) for improving the accuracy of autonomous strapdown inertial navigation systems (SINS) is presented. The proposed method is a terrain-aided navigation (TAN) algorithm based on landmark detection combined with a classical SINS. It is shown via a set of simulations that the method can improve significantly the precision of autonomous n... View full abstract»

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  • Spacecraft attitude/rate estimation using vector-aided GPS observations

    Publication Year: 1999, Page(s):1019 - 1032
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    A sequential filtering algorithm is presented for spacecraft attitude and attitude-rate estimation from Global Positioning System (GPS) differential carrier phase measurements. A third-order, minimal-parameter method for solving the attitude matrix kinematic equation is used to parameterize the state of the filter, which renders the resulting estimator computationally efficient. Borrowing from tra... View full abstract»

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  • Robust statistical feature based aircraft identification

    Publication Year: 1999, Page(s):1077 - 1094
    Cited by:  Papers (36)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1324 KB)

    The statistical feature based (StaF) classifier is presented for robust high range resolution (HRR) radar aircraft identification (ID). HRR signature peak features are selected “on the fly” with no a priori assumptions about the number or location of the features. Features extracted depends on the information content of the observed signature making the number, location, and amplitude ... 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. 

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory