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IEEE Transactions on Aerospace and Electronic Systems

Issue 4 • Date Oct. 1994

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Displaying Results 1 - 25 of 28
  • Comments on "Effect of wet snow an the null-reference ILS system"

    Publication Year: 1994, Page(s):1086 - 1090
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The subject paper (July 1993) has raised some issues regarding the probability of the Instrument Landing System (ILS) radiating out-of-tolerance vertical guidance signals. An independent study has substantiated the findings of that paper and adds further concern regarding some FAA ILS snow procedures. The principal conclusions of this paper are: 1) an analysis, based on Walton's discovery of rare ... View full abstract»

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  • Comment on "Inversion of all principal submatrices of a matrix"

    Publication Year: 1994, Page(s):1114 - 1115
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB)

    The paper by Koc and Chen (1994) includes new formulas for computational complexity, but the method itself is already known and has dubious numerical stability. A poorly conditioned example is shown.<> View full abstract»

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  • Loop gain of a spacecraft switched shunt power system

    Publication Year: 1994, Page(s):1049 - 1053
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A novel approach of deriving the loop gain of a spacecraft switched shunt power system is presented. The system hardware elements contain both the analog and the digital components. Transfer functions of the analog circuits are easily identified employing the conventional approach. Gain function of the digital block is however conceived following a quite unconventional route. The digital gain is s... View full abstract»

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  • The case for like-sensor predetection fusion

    Publication Year: 1994, Page(s):986 - 1000
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1268 KB)

    There has been a great deal of theoretical study into decentralized detection networks composed of similar (often identical), independent sensors, and this has produced a number of satisfying theoretical results. At this point it is perhaps worth asking whether or not there is a great deal of point to such study-certainly two sensors can provide twice the illumination of one, but what does this re... View full abstract»

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  • Inherent bias assessment in height computation employing mixed-type radar data

    Publication Year: 1994, Page(s):1045 - 1049
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The objective here is the analysis of a systematic error inherently existing in aircraft geometric height monitoring under radar surveillance. This error is caused by the nonlinear processing of noisy measurements. The geometric height system under investigation uses mixed-type radar data, since the height is computed by referring range raw measurements to horizontal trajectory smoothed data View full abstract»

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  • Requirements for optimal glint reduction by diversity methods

    Publication Year: 1994, Page(s):1108 - 1114
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    Target “glint” (the difference between the phase-front gradient of the scattered field and the true target direction vector) is related to the analytic properties of the scattered field. The resulting model is used to reinterpret diversity methods for glint reduction and to more accurately specify system requirements. A relationship for estimating the best possible improvement in targe... View full abstract»

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  • Authors' reply [Computational complexity of matrix inversion]

    Publication Year: 1994
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    The purpose of our two-page communication was to study the computational complexity of a matrix inversion formula with the intention of showing its improvement over the naive method of computing the inverse separately. We did not intend to claim that the matrix inversion formula is our discovery. However, it is true that this point was not made clear in our short paper View full abstract»

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  • On cross-ambiguity properties of Welch-Costas arrays

    Publication Year: 1994, Page(s):1063 - 1071
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    We discuss cross-ambiguity properties of a specific family of Costas arrays called Welch-Costas (W-C) arrays. These properties are of interest in multiuser radar and sonar system, especially since Costas arrays are known to possess ideal auto-ambiguity functions. The theory of W-C arrays is reviewed. It is then proved that only pairs of W-C arrays can have at most two hits in their cross-ambiguity... View full abstract»

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  • Eigenstructure assignment using output feedback

    Publication Year: 1994, Page(s):1129 - 1130
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    An eigenspace, achievable by gain output feedback, is proposed by Andry et al. (1983). One example contradicting the above conclusion is given by Kang and Lee (1992). The contradiction is due to the limitation of the result presented by Andry. This note derives the complete specification of the eigenspace which can be achieved by gain output feedback View full abstract»

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  • Attitude determination using dedicated and nondedicated multiantenna GPS sensors

    Publication Year: 1994, Page(s):1053 - 1058
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    We show that the use of nondedicated Global Positioning System (GPS) sensors to determine the attitude parameters of a vessel yields the same level of performance as the use of a dedicated multiantenna receiver, namely an agreement of the order of 0.1° (1σ). The test platform is a survey launch operating at cruising speeds of 10 to 15 kt. The dedicated multiantenna receiver is a four-ant... View full abstract»

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  • A method for improving extended Kalman filter performance for angle-only passive ranging

    Publication Year: 1994, Page(s):1090 - 1093
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A relatively simple method is presented which eliminates previously reported (Oct. 1985) erratic estimation performance associated with Cartesian formulations of the extended Kalman filter (EKF) for the 2D angle-only emitter location problem. The technique is based on an initialization procedure which combines a priori probability density function (pdf) information with single measurement a poster... View full abstract»

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  • Mutual coupling effects and their reduction in wideband direction of arrival estimation

    Publication Year: 1994, Page(s):1116 - 1122
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The performance of multiple signal classification (MUSIC) algorithm using three different inputs over a wideband of frequencies is considered. These inputs are: 1) ideal voltages, 2) actual voltages which include coupling effects and are obtained with the method or moments, and 3) corrected voltages which are obtained from the actual voltages so that the mutual coupling effects are removed. Linear... View full abstract»

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  • Precise navigation using adaptive FIR filtering and time domain spectral estimation

    Publication Year: 1994, Page(s):1071 - 1076
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This paper introduces a new low cost, short range, positioning system based on adaptive finite impulse response (FIR) filtering and time domain spectral estimation. The system can determine absolute positions with a high degree of accuracy and is well suited for real time navigation. The approach is based upon signal processing techniques and a priori knowledge of the system transfer function. The... View full abstract»

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  • Further results on adaptive filtering with embedded CFAR

    Publication Year: 1994, Page(s):1009 - 1020
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Among the few known adaptive filtering algorithms which have an embedded (integrated) constant false alarm rate (CFAR) performance feature, the generalized likelihood ratio (GLR) test algorithm has been found to be robust in non-Gaussian clutter. This paper examines the detection performance of the GLR algorithm in nonhomogeneous/nonstationary clutter environments which lead to nonidentical distri... View full abstract»

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  • Relationship between navigation vertical error, VDOP, and pseudo-range error in GPS

    Publication Year: 1994, Page(s):1138 - 1142
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    At a specified position and time, vertical position error is related to satellite ranging errors by the relationship Z=VDOP*URE where URE is the user range equivalent error, VDOP is the vertical dilution of precision, and Z is the vertical position error. This relationship is developed and it is shown that it is statistically correct even when position and time are variables. Expressions are given... View full abstract»

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  • Patch diameter limitation due to high chirp rates in focused SAR images

    Publication Year: 1994, Page(s):1125 - 1129
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Polar-format processed synthetic aperture radar (SAR) images have a limited focused patch diameter that results from unmitigated phase errors. Very high chirp rates, encountered with fine-resolution short-pulse radars, exasperate the problem via a residual video phase error term. This letter modifies the traditional maximum patch diameter expression to include effects of very high chirp rates View full abstract»

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  • On the orientation vector differential equation in strapdown inertial systems

    Publication Year: 1994, Page(s):1076 - 1081
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    An alternate derivation of the orientation vector differential equation is given, together with an assessment of the error inherent in the simplified form of this equation commonly utilized in strapdown inertial systems View full abstract»

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  • Task allocation and reallocation for fault tolerance in multicomputer systems

    Publication Year: 1994, Page(s):1094 - 1104
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    The goal of task allocation in a set of interconnected processors (computers) is to maximize the efficient use of resources and thus reduce the job turnaround time. Proposed is a simple yet effective method to allocate the tasks in multicomputer systems for minimizing the interprocessor communication cost subject to resource limitations defined by the system and designer. The limitations can be vi... View full abstract»

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  • Monopulse radar angle measurement in noise [Errata]

    Publication Year: 1994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (32 KB)

    A correction is given for the third sentence in the paragraph containing Equation (24) on Page 955, Column 2 View full abstract»

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  • On the exact solutions of pseudorange equations

    Publication Year: 1994, Page(s):1021 - 1030
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Three formulations of exact solution algorithms to the system of determined pseudorange equations are derived. It is demonstrated that pseudorange equations are hyperbolic in nature and may have two solutions, even when the emitter configuration is nonsingular. Conditions for uniqueness and for the existence of multiple solutions are derived in terms of the Lorentz inner product. The bifurcation p... View full abstract»

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  • Enhancing filter robustness in cascaded GPS-INS integrations

    Publication Year: 1994, Page(s):1001 - 1008
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    Filter robustness is defined herein as the ability of the Global Positioning System/Inertial Navigation System (GPS-INS) Kalman filter to cope with adverse environments and input conditions, to successfully identify such conditions and to take evasive action. The formulation of two such techniques for a cascaded GPS-INS Kalman filter integration is discussed This is an integration in which the nav... View full abstract»

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  • A new method for finding electromagnetic emitter location

    Publication Year: 1994, Page(s):1081 - 1085
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The position of a source of radiation is often obtained from bearing data, taken over an interval of time, and combining it with navigation data. A new method using total least squares (TLS) has been suggested for the accurate estimation of an emitter location when bearing observation errors are random. Further, an iterative two-stage approach involving TLS and Kalman filtering is developed for ac... View full abstract»

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  • Ambiguity resolution of multiple targets using pulse-Doppler waveforms

    Publication Year: 1994, Page(s):1130 - 1137
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    To cancel clutter, both medium-PRF waveforms which are ambiguous in both range and Doppler and high-PRF waveforms which are ambiguous in range but unambiguous in ambiguities, a previous paper has shown that superior results for a single target can be achieved by using a clustering algorithm. Here, the problem of multiple targets is considered. A maximum likelihood (ML) technique which incorporates... View full abstract»

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  • Antenna sidelobes in the presence of flat reflectors

    Publication Year: 1994, Page(s):1122 - 1125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Reflecting surfaces near the antenna may produce surprisingly large sidelobes even if the designed free-space sidelobes in the directions of these surfaces are very small. Calculations of such sidelobes are presented for an example of a linear aperture with a parabolic weighting function for the received signal amplitude View full abstract»

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  • Reduction of interference from DGPS transmissions in the MF band using a GMSK modulation scheme

    Publication Year: 1994, Page(s):1104 - 1108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    The accuracy of the Global Positioning System (GPS) can be improved by differential techniques. For maritime applications a DGPS service with transmissions by maritime radiobeacons in the MF band is provided. It offers a position accuracy of approximately 5 m. For the data link a minimum shift keying (MSK) modulation scheme has been recommended. The adjacent channel interference at the maximum tra... 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