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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • July 1994

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Displaying Results 1 - 25 of 40
  • Comments on "The /spl alpha/-/spl beta/-/spl Gamma/ tracking filter with a noisy jerk as the maneuver model"

    Publication Year: 1994, Page(s):925 - 927
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    In ibid, vol. AES-29, p.578-590 (Apr. 1993), J Sudano presented the optimal steady-state gains and associated error covariances for an /spl alpha/-/spl beta/-/spl Gamma/ filter with a piecewise constant jerk as a maneuver model. While the results given in that article are correct, the gains and error covariances can be found in a much simpler manner. The simplified expressions for the gains and th... View full abstract»

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  • Comments on "cancellation of specular and diffuse jammer multipath using a hybrid adaptive array"

    Publication Year: 1994, Page(s):932 - 933
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    Prior work relating to the subject paper is noted here with respect to the performance analysis of a tapped delay line sidelobe canceler in the context of a simple specular two-path bandpass interference model.<> View full abstract»

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  • Commentary on Walton correspondence relating to the ILS glide slope

    Publication Year: 1994, Page(s):933 - 935
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB)

    The author suggests that the conclusions reached by Dr. Walton (see IEEE Transactions Antennas Propagation AP-33, p.908-917, (Aug. 1985)) are misleading. The instrument landing system (ILS) glide slope is a contemporary approach and landing aid which is a crucial element in maintaining air safety and preserving human life. For this reason an important goal has been to document carefully technical ... View full abstract»

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  • Clutter covariance smoothing by subaperture averaging

    Publication Year: 1994, Page(s):941 - 945
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Space-time processing has been proposed as an approach by which an airborne radar can adaptively detect small targets in the presence of ground clutter and jammers, provided the covariance matrix of the interference is available. One of the difficulties in estimating the covariance matrix is the need to obtain a sufficient number of independent samples, especially for high pulse-repetition-frequen... View full abstract»

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  • A variable projection method for additive components with application to GPS

    Publication Year: 1994, Page(s):928 - 930
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A variable projection method is presented for the case of additive linear components. Specifically, the least-squares problem of minimizing ||x-f(φ)-Lλ||2 over parameters (λ,φ) is reduced to that of minimizing ||Γ[x-f(φ)]||2 over φ, where Γ is an (n-p)×n projection orthogonal to L, p being the dimension of λ. Applications... View full abstract»

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  • Properties of the periodic ambiguity function

    Publication Year: 1994, Page(s):938 - 941
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The periodic ambiguity function (PAF) is a tool for analyzing the performance of a radar system utilizing a periodically modulated CW signal and a receiver matched to one or several periods thereof. Alternative definitions for the PAF are given and the properties of the PAF are elaborated The properties shown include periodicity, symmetry with respect to the origin and the volume limitation proper... View full abstract»

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  • Resolution limits of ultra wideband synthetic aperture radar using a rectangular aperture for FFT processing

    Publication Year: 1994, Page(s):935 - 938
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Formulas are derived for synthetic aperture radar range and cross-range resolution without restrictions on percentage bandwidth or integration angle. Restriction to rectangular apertures allows efficient FFT processing and weighting for sidelobe control. The optimum square aperture (equal resolution) and rectangular aperture (minimum resolution area) are derived View full abstract»

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  • Control system architecture for intelligent space robot

    Publication Year: 1994, Page(s):979 - 982
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The outline of China's experimental ground testbed for space intelligent robot is described, followed by the realization processes of master/slave teleoperation, supervised autonomy control and discussion of other relevant problems View full abstract»

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  • The HAL-3 radar test set

    Publication Year: 1994, Page(s):919 - 924
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    This paper presents the HAL-3 radar test set (called the set in the following) used to measure the technical specifications of the HAL-3 airborne radar and to maintain it based on tested results. Some new techniques are employed in the set, including sinusoidal pulsewidth modulation (SPWM) in the power supply, digital gyro simulator and automatic test module (ATM) with STD industrial control micro... View full abstract»

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  • Target tracking using infrared measurements and laser illumination

    Publication Year: 1994, Page(s):758 - 768
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    A missile target tracker is designed using a filter/correlator (with adaptive target shape identification) based on forward-looking infrared (FLIR) sensor measurements to track the center-of-intensity of the hardbody/plume combination, and another filter using Doppler and/or speckle information in the return from a low-power laser illuminator to estimate the offset between the intensity centroid a... View full abstract»

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  • Tracking low elevation targets in the presence of multipath propagation

    Publication Year: 1994, Page(s):973 - 979
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A tracking algorithm based on a measurement model of the multipath propagation effects on the elevation angle measurements is presented. This algorithm does not depend on the specific signal processing and the prevailing environmental conditions. The results of simulations based on several scenarios are presented. The signal processing model used to generate the elevation measurements of a low-fly... View full abstract»

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  • Asynchronous distributed detection

    Publication Year: 1994, Page(s):818 - 826
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Binary parallel distributed-detection architectures employ a bank of local detectors to observe a common volume of surveillance, and form binary local decisions about the existence or nonexistence of a target in that volume. The local decisions are transmitted to a central detector, the data fusion center (DEC), which integrates them to a global target or no target decision. Most studies of distri... View full abstract»

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  • Near term approach to data relay for satellites under test

    Publication Year: 1994, Page(s):778 - 786
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The increasing need for a continuous communications link with U.S. Department of Defense (DoD) spacecraft during test missions in low Earth orbit (LEG) has resulted in greater interest in geosynchronous data relay services. This may be a more economical alternative to building additional remote tracking stations for the Air Force Satellite Control Network (AFSCN), and avoids tying up operational a... View full abstract»

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  • Growler detection in sea clutter with coherent radars

    Publication Year: 1994, Page(s):836 - 847
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1076 KB)

    Ship navigation through ice-infested waters is a problem of deep concern to the Canadian shipping and exploration industry. Conventional marine radars have difficulty detecting small pieces of glacial ice called growlers which are very hazardous to vessels if struck. In an effort to improve detection performance, X-band radar measurements were collected and analyzed to determine the characteristic... View full abstract»

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  • Design and analysis of new p(n,k) polyphase pulse compression codes

    Publication Year: 1994, Page(s):865 - 874
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    P(n,k) codes as a new class of polyphase pulse compression codes are introduced and analyzed in detail. The P(n,k) codes are conceptually derived by step approximation of the phase function of a nonlinear-frequency modulated (NLFM) Chirp signal with a favorable energy density spectrum. The significant advantages of P(n,k) codes over conventional polyphase codes are lower autocorrelation sidelobes ... View full abstract»

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  • Moving target imaging and trajectory computation using ISAR

    Publication Year: 1994, Page(s):887 - 899
    Cited by:  Papers (67)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    Novel algorithms for moving target imaging and trajectory computation using a two-receiver radar are presented. The range-bin alignment is implemented with an adaptive method using the envelope correlation feature of different returns and the angular trajectory equation is solved using a linear least squares method combined with a unique phase-unwrapping technique. The angular positions of the syn... View full abstract»

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  • Complexity analysis of wavelet signal decomposition and reconstruction

    Publication Year: 1994, Page(s):910 - 918
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    We give certain sequential and parallel algorithms and their computational analysis for signal decomposition and reconstruction based on wavelets. The signal decomposition (respectively, reconstruction) process is separated into two stages: the first is the preprocessing stage where certain constants are computed for implementation to prepare for the second stage in which signal decomposition (res... View full abstract»

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  • Flexible spacestructure control via moving-bank multiple model algorithms

    Publication Year: 1994, Page(s):750 - 757
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The development and performance of moving-bank multiple model adaptive control (MMAC) algorithms for quelling vibrations induced in the SPICE 2 space structure are presented. The structure consists of a large platform and a smaller platform connected by three legs in a tripod fashion. Deviations of the line-of-sight (LOS) vector from the center of the large platform to the center of the smaller pl... View full abstract»

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  • Equivalence of finite memory filters

    Publication Year: 1994, Page(s):968 - 972
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The well-known Jazwinski's limited memory filter, Schweppe's finite memory filter, and Kwon's optimal finite impulse response (FIR) filter are compared in the filter structures, system models, and optimality criterions, and are shown to be equivalent on condition that they are applied to the discrete system with no process noise and unknown prior information of the system state. The different prop... View full abstract»

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  • Cumulant-based blind optimum beamforming

    Publication Year: 1994, Page(s):722 - 741
    Cited by:  Papers (55)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Sensor response, location uncertainty, and use of sample statistics can severely degrade the performance of optimum beamformers. We propose blind estimation of the source steering vector in the presence of multiple, directional, correlated or coherent Gaussian interferers via higher order statistics. In this way, we employ the statistical characteristics of the desired signal to make the necessary... View full abstract»

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  • Conversion of Earth-centered Earth-fixed coordinates to geodetic coordinates

    Publication Year: 1994, Page(s):957 - 961
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The transformations between Earth-centered Earth-fixed (ECEF) coordinates and geodetic coordinates are required in many applications, for example, in NAVSTAR/GPS navigation and geodesy. The transformation from ECEF coordinates to geodetic coordinates is usually carried out by approximation methods in practice, and the exact transformation methods are not used frequently. In this paper, several exa... View full abstract»

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  • CFAR integration processors in randomly arriving impulse interference

    Publication Year: 1994, Page(s):809 - 817
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    Time diversity transmission is often used to circumvent the high probability of a deep fade on a single transmission which may result in loss of the signal. One way to combat deep fades is to postdetection integrate the received observations from each range resolution cell. The false alarm rate of the postdetection integrator (PI) is extremely sensitive to randomly arriving impulse interference. S... View full abstract»

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  • Multisensor distributed sequential detection

    Publication Year: 1994, Page(s):698 - 708
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A conceptual generalization of the Wald's sequential probability ratio test (SPRT) to a decentralized environment is presented. The local tests are chosen to be SPRT's, which quantize the temporally independent identically distributed (IID) observations into three levels for transmission to the fusion detector. Spatial independence among the local observations is assumed. The fusion test is also a... View full abstract»

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  • Space Station laboratory module power loading analysis

    Publication Year: 1994, Page(s):945 - 950
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The electrical power system of Space Station Freedom is an isolated electrical power generation and distribution network designed to meet the demands of a large number of electrical loads. An algorithm is developed to determine the power bus loading status under normal operating conditions to ensure the supply meets demand. The probabilities of power availability for payload operations (experiment... View full abstract»

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  • A combinatorial rule to determine the probability of n consecutive successes of N tries

    Publication Year: 1994, Page(s):931 - 932
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    A procedure for the determination of the probability or n consecutive successes of N tries is presented The procedure is based on the formation of a coefficient array. The coefficients are determined using a combinatorial rule 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