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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • April 1993

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Displaying Results 1 - 25 of 35
  • Comments on "Computation of the circular error probability integral" by J.T. Gillis

    Publication Year: 1993, Page(s):553 - 555
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    A numerical technique for computing the circular error probability (CEP) integral using only elementary functions is presented. It is simpler and more accurate than the truncated series solution in the above-titled paper (see ibid., vol.27, p.906-10, Nov. 1991).<> View full abstract»

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  • Multiple target tracking using products of position measurements

    Publication Year: 1993, Page(s):476 - 493
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1108 KB)

    The continued development of the symmetric measurement equation (SME) filter for track maintenance in multiple target tracking (MTT) is considered, focusing on the case in which the SMEs are generated by forming sums of products of the original position measurements. The SME filter is developed for the case of N targets whose motions consist of random perturbations about constant-velocity... View full abstract»

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  • Optimum FFT-based frequency acquisition with application to COSPAS-SARSAT

    Publication Year: 1993, Page(s):464 - 475
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    In the case of a single sinusoid or multiple well-separated sinusoids, a coarse estimator consisting of a windowed Fourier transform followed by a fine estimator which is an interpolator is a good approximation to an optimal frequency acquisition and measurement algorithm. The design tradeoffs are described. It is shown that for the fine-frequency estimator a good method is to fit a Gaussian funct... View full abstract»

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  • A Boolean algebra approach to multiple sensor voting fusion

    Publication Year: 1993, Page(s):317 - 327
    Cited by:  Papers (29)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    A technique for integrating multiple-sensor data using a voting fusion process that combines the individual sensor outputs is described. An important attribute of the method is the automatic confirmation of the target by the fusion processor without the need to explicitly determine which sensors and what level of sensor participation are involved. A three-sensor system, with multiple confidence le... View full abstract»

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  • Isolating errors in models of complex systems

    Publication Year: 1993, Page(s):452 - 463
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    One of the steps in creating a mathematical model of a system is to test the model after it has been fully specified, to see whether it is performing adequately. Often, it is found that the model is not performing acceptably (e.g. the model is not giving accurate predictions of the performance of the actual system). The same lack of fidelity can also be observed in established models that had been... View full abstract»

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  • Digital system design in the presence of single event upsets

    Publication Year: 1993, Page(s):310 - 316
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The authors consider the effects of single event upsets (SEUs) on digital systems, and show techniques for designing reliable systems with current levels of SEU protection. Three main systems are discussed: main memory, logic, and cache memory. A design for the main and cache memory subsystems that are SEU protected is also described. With SEU defined in bit days p, and using single error... View full abstract»

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  • Space-based tactical ballistic missile launch parameter estimation

    Publication Year: 1993, Page(s):412 - 424
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    The author explores the influence of a priori uncertainties in launch time and trajectory fly-out profiles, along with sensor angle measurement errors, on the estimation of missile launch location and heading angle. An error model is developed to compute the statistics of the estimation errors using a single pair of angle measurements, one from each of two satellites, or both from the same satelli... View full abstract»

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  • A match/merge technique for 121.5/243 MHz beacons in the COSPAS-SARSAT system

    Publication Year: 1993, Page(s):518 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The COSPAS-SARSAT Mission Control Center (MCC) matches and merges estimates of position and frequency of 121.5/243 MHz distress beacons received from various ground stations and satellites. The matching and merging are done sequentially as the estimates are received, and merges are not reversed once sent out to search-and-rescue forces. A sequential, irreversible match/merge algorithm is derived b... View full abstract»

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  • A modified Gaussian sum approach to estimation of non-Gaussian signals

    Publication Year: 1993, Page(s):446 - 451
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A Gaussian sum estimation algorithm has previously been developed to deal with noise processes that are non-Gaussian. Inherent in this algorithm is a serious growing memory problem that causes the number of terms in the Gaussian sum to increase exponentially at each iteration. A modified Gaussian sum estimation algorithm using an adaptive filter is developed that avoids the growing memory problem ... View full abstract»

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  • A localizer design to improve missed approach guidance

    Publication Year: 1993, Page(s):302 - 309
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A novel VHF localizer system has been designed, built and successfully tested to provide increased reliability and safety of commercial and general aviation air transportation. Additional benefits are more precise tracks for aircraft executing a missed approach, reduced volume of the airspace needed for missed approaches, and reduced sizes of areas affected by noise. The design uses contemporary i... View full abstract»

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  • Beam overlap impact on phased-array target detection

    Publication Year: 1993, Page(s):404 - 411
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The impact of beam overlap on the probability of detection during a single scan of a phased-array volumetric scan radar is examined. Rectangular and triangular beam packing arrangements are considered. Beam positions near the beam most centered on the target are allowed to contribute to the detection process. The treatment of the impact of beam overlap on target detection for a phased array is con... View full abstract»

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  • The α-β-Γ tracking filter with a noisy jerk as the maneuver model

    Publication Year: 1993, Page(s):578 - 580
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The optimal gains and covariances of an α-β-Γ filter are computed. It is assumed that the maneuver model is an uncorrelated zero mean noise jerk. Input to the tracking filter is position updates. The measurement errors are modeled as uncorrelated zero mean noise processes View full abstract»

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  • Suboptimal joint probabilistic data association

    Publication Year: 1993, Page(s):510 - 517
    Cited by:  Papers (46)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    A significant problem in multiple target tracking is the hit-to-track data association. A hit is a received signal from a target or background clutter which provides positional information. If an incorrect hit is associated with a track, that track could diverge and terminate. Prior methods for this data association problem include various optimal and suboptimal two-dimensional assignment algorith... View full abstract»

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  • Classification of radar targets using synthetic neural networks

    Publication Year: 1993, Page(s):336 - 344
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    Radar target classification performance of neural networks is evaluated. Time-domain and frequency-domain target features are considered. The sensitivity of the neural network algorithm to changes in network topology and training noise level is examined. The problem of classifying radar targets at unknown aspect angles is considered. The performance of the neural network algorithms is compared wit... View full abstract»

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  • Recursive temporal-spatial information fusion with applications to target identification

    Publication Year: 1993, Page(s):435 - 445
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Centralized/distributed recursive algorithms for temporal-spatial information integration using the Dempster-Shafer technique are developed. Compared with the Bayesian approach, the Dempster-Shafer technique has the strong capability of handling information uncertainties, which are particularly desirable in many applications. In the centralized integration algorithm, all information is pooled into... View full abstract»

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  • A method of obtaining signal components of residual carrier signal with their power content and computer simulation

    Publication Year: 1993, Page(s):532 - 540
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    An algorithm for obtaining all signal components of a residual carrier signal with any number of channels is presented. The phase modulation type may be NRZ-L or split phase (Manchester). The algorithm also provides an easy way of obtaining the power contents of the signal components. Steps to recognize the signal components that influence the carrier tracking loop and the data tracking loop at th... View full abstract»

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  • Real-time parameter identification applied to flight simulation

    Publication Year: 1993, Page(s):290 - 301
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    In-flight simulations are normally accomplished using model-following control laws which depend on accurate knowledge of the stability derivatives of the host aircraft. Degraded simulation results if the stability derivatives deviate considerably from their presumed values. Gain scheduling is often used to compensate for plant parameter variations, but this form of open-loop compensation usually r... View full abstract»

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  • Azimuthal scattering pattern of trees at X-band

    Publication Year: 1993, Page(s):588 - 593
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The azimuthal scattering characteristics of a variety of fully foliated trees were measured in the field using a short-range X-band bistatic radar system operating at 9 GHz. Azimuthal measurements were made for both VV and VH polarizations over a 180° angle between the transmitter and receiver antennas at 10° intervals. Data were collected at transmit and receive ranges of approxi... View full abstract»

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  • Spacecraft design considerations for small satellite remote sensing

    Publication Year: 1993, Page(s):391 - 403
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1128 KB)

    The idea of adapting existing small satellite technology for remote sensing purposes is discussed. The major design problems and constraints influencing the design of a small low-cost remote sensing satellite bus are identified using the subsystem approach. Key design areas include the improvement of battery technology and the development of a deployable solar array, attitude control assemblies, o... View full abstract»

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  • Simple linear theory approach to TMA observability

    Publication Year: 1993, Page(s):575 - 578
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    From previous publications, the derivation of necessary and sufficient conditions for the general three-dimensional target motion analysis (TMA) observability problem, given angle measurements, seemed to be too difficult within the framework of linear equations. It is shown that the derivation nevertheless is very simple, if a proper observability criterion is applied View full abstract»

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  • Dynamic compensator design in nonlinear aerospace systems

    Publication Year: 1993, Page(s):364 - 379
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1132 KB)

    Based on differential algebraic results, dynamic controllers are proposed for the feedback regulation of typical aerospace systems. Fliess's generalized observability canonical form (GOCF) is used for specifying a dynamic compensator that smoothly regulates the plant dynamics. The synthesis approach used is also applicable to the design of nonlinear pulsewidth-modulation (PWM) controllers, as well... View full abstract»

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  • A multisensor-multitarget data association algorithm for heterogeneous sensors

    Publication Year: 1993, Page(s):560 - 568
    Cited by:  Papers (28)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    The problem of associating data from three spatially distributed heterogeneous sensors with three simultaneous detections for all three is discussed. The sensors can be active or passive. The source of a detection can be either a real target, in which case the measurement is the true observation variable of the target plus measurement noise, or a spurious one, i.e. a false alarm. The sensors may h... View full abstract»

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  • Interacting multiple model tracking with target amplitude feature

    Publication Year: 1993, Page(s):494 - 509
    Cited by:  Papers (112)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    A recursive tracking algorithm is presented which uses the strength of target returns to improve track formation performance and track maintenance through target maneuvers in a cluttered environment. This technique combines the interacting multiple model (IMM) approach with a generalized probabilistic data association (PDA), which uses the measured return amplitude in conjunction with probabilisti... View full abstract»

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  • Synchronization failure rates in master-slave synchronized phase-locked loops

    Publication Year: 1993, Page(s):328 - 335
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    A method for the computation of synchronization failure rates in master-slave phase-synchronized first-order phase-locked loops (PLLs) is presented. The method assumes (propagation) delay times that are long compared with tracking loop time constants and allows system optimizations of the slaved PLL in terms of improved tracking performance. Frequency turnaround ratios of phase-coherent transponde... View full abstract»

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  • AC/DC converter topologies for the Space Station

    Publication Year: 1993, Page(s):425 - 434
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    A new class of AC/DC converter topologies (Type-1 converters) is described, suitable for use in an advanced single-phase sine-wave voltage, high-frequency power distribution system, of the type that was proposed for a 20 kHz Space Station primary electrical power distribution system. The converter comprises a transformer, a resonant network, a current controller, a diode rectifier, and an output f... 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