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IEEE Transactions on Aerospace and Electronic Systems

Issue 3 • Date 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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  • Moving target imaging and trajectory computation using ISAR

    Publication Year: 1994, Page(s):887 - 899
    Cited by:  Papers (39)
    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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  • Conversion of Earth-centered Earth-fixed coordinates to geodetic coordinates

    Publication Year: 1994, Page(s):957 - 961
    Cited by:  Papers (13)
    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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  • 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 (3)
    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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  • Carrier and intermodulation performance of limiters excited by multicarriers

    Publication Year: 1994, Page(s):650 - 659
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A general formula, using a Fourier-series representation, is derived for the input-output characteristic of ideal hard limiters, biased hard limiters and biased soft limiters. Using this formula one can obtain an expression, involving Bessel functions for calculating the amplitudes of the output products of a limiter excited by a multicarrier signal plus Gaussian noise. In contrast with previously... 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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  • Cumulant-based blind optimum beamforming

    Publication Year: 1994, Page(s):722 - 741
    Cited by:  Papers (41)
    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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  • Complexity analysis of wavelet signal decomposition and reconstruction

    Publication Year: 1994, Page(s):910 - 918
    Cited by:  Papers (4)
    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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  • On adaptive spatial-temporal processing for airborne surveillance radar systems

    Publication Year: 1994, Page(s):660 - 670
    Cited by:  Papers (162)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    Implementing the optimum spatial-temporal (angle-Doppler) processor involves two crucial issues: the selection of processing configurations, and the development of adaptive algorithms which can efficiently approach the performance potential of the selected configuration. Among the three available configurations, the joint-domain, the cascade space-time, and the cascade time-space, this work shows ... View full abstract»

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  • Modeling the protection system components of the space station electric power system

    Publication Year: 1994, Page(s):800 - 808
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    To facilitate protection system studies on the space station electric power system, there is a need to develop a model that can accurately and conveniently simulate both the power system and the protection system. Models for two major protective devices, the remote bus isolator and the remote power controller, are described. These models have been installed in a power system model resembling one c... 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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  • Tracking low elevation targets in the presence of multipath propagation

    Publication Year: 1994, Page(s):973 - 979
    Cited by:  Papers (23)  |  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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  • Space Station laboratory module power loading analysis

    Publication Year: 1994, Page(s):945 - 950
    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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  • Detection threshold selection for tracking performance optimization

    Publication Year: 1994, Page(s):742 - 749
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    A technique for the evaluation of the track loss probability and the estimation error during track maintenance in clutter has been developed recently by the authors. This work overcomes the limitation of an earlier technique that does not handle the transient process of tracking divergence. Track loss, being a “runaway” phenomenon, clearly requires transient evaluation capability. The ... 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 (15)  |  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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  • A recursive multiple model approach to noise identification

    Publication Year: 1994, Page(s):671 - 684
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Correct knowledge of noise statistics is essential for an estimator or controller to have reliable performance. In practice, however, the noise statistics are unknown or not known perfectly and thus need to be identified. Previous work on noise identification is limited to stationary noise and noise with slowly varying statistics only. An approach is presented here that is valid for nonstationary ... 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
    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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  • Synergism of binocular and motion stereo for passive ranging

    Publication Year: 1994, Page(s):709 - 721
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    Range measurements to objects in the world relative to mobile platforms such as ground or air vehicles are critical for visually aided navigation and obstacle detection/avoidance. An approach is presented that consists of a synergistic combination of two types of passive ranging method: binocular stereo and motion stereo. We show a new way to model the errors in binocular and motion stereo in conj... View full abstract»

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  • Efficient matched filter for the generalized chirp-like polyphase sequences

    Publication Year: 1994, Page(s):769 - 777
    Cited by:  Papers (12)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The efficient implementation of the matched filter for the generalized chirp-like (GCL) polyphase sequences is presented. These sequences can be classified as the modulatable orthogonal sequences, because they can be modulated by a string of arbitrary complex numbers of unit magnitude, retaining the ideal periodic autocorrelation function and optimum crosscorrelation function. For the applications... View full abstract»

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  • False alarm analysis of the envelope detection GO-CFAR processor

    Publication Year: 1994, Page(s):848 - 864
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The greatest of constant false alarm rate processor (GO CFAR) is a useful architecture for adaptively setting a radar detection threshold in the presence of clutter edges. The GO CFAR input is often the envelope detected in-phase (I) and quadrature (Q) channels of the baseband signal (xe=√(I2+Q2)). This envelope detection can also be approximated using x=a ma... View full abstract»

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  • Adaptive control for a sensorless permanent-magnet synchronous motor drive

    Publication Year: 1994, Page(s):900 - 909
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    An adaptive velocity controller for a permanent-magnet synchronous motor without using shaft sensor is presented. Two line-to-line voltages and two stator currents are sensed to produce the flux position. The design part is concerned with the formulation of control algorithm for current-regulated pulsewidth modulated inverter and vector control strategy for speed loop. Under the vector control fra... View full abstract»

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  • Multisensor distributed sequential detection

    Publication Year: 1994, Page(s):698 - 708
    Cited by:  Papers (19)
    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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  • Data fusion of decentralized local tracker outputs

    Publication Year: 1994, Page(s):787 - 799
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    An approach for fusing offboard track-level data at a central fusion node is presented. The case where the offboard tracker continues to update its local track estimate with measurement and system dynamics models that are not necessarily linear is considered. An algorithm is developed to perform this fusion at a central node without having access to the offboard measurements, their noise statistic... 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