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IEEE Transactions on Aerospace and Electronic Systems

Issue 1 • Date Jan. 1991

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Displaying Results 1 - 24 of 24
  • Comments on "Detector relative efficiencies in the presence of Laplace noise" by M.I. Dadi and J.R. Marks II

    Publication Year: 1991, Page(s):177 - 178
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    In the above-titled paper (see ibid., vol.AES-23, p.568-82, July 1987) M.I. Dadi and J.R. Marks II studied the relative efficiencies of the Neyman-Pearson optimal detector with respect to the linear and sign detectors, for the detection of a constant signal in additive Laplace noise. By applying the central limit theorem, they derived expressions for three types of asymptotic relative efficiencies... View full abstract»

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  • Low sidelobe radar waveforms derived from orthogonal matrices

    Publication Year: 1991, Page(s):92 - 102
    Cited by:  Papers (31)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    Novel waveforms are described that have low sidelobes when individual or multiple waveforms are approximately processed. They are related to orthogonal matrices that may be associated with complementary sequences and also with periodic waveforms having autocorrelation functions with constant zero-amplitude sidelobes. Also described are sets of sequences whose cross-correlation functions sum to zer... View full abstract»

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  • Convergence properties of Gram-Schmidt and SMI adaptive algorithms. II

    Publication Year: 1991, Page(s):83 - 91
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    For pt.I see ibid., vol.26, no.1, p.44-56, Jan. 1990. Theorems and relationships associated with the convergence rate of the Gram-Schmidt (GS) and sampled matrix inversion (SMI) algorithms are presented. Two forms of the GS canceler are discussed: concurrent block processing and sliding window processing. It is shown (as has been stated by other researchers) that the concurrent block processed GS ... View full abstract»

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  • Nonlinear modeling of gated tracker dynamics with application to radar range resolution

    Publication Year: 1991, Page(s):68 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB)

    Nonlinear dynamic models for gated radar range trackers are developed and applied to the range resolution problem. Two common types of tracking loop dynamics, as well as the automatic gain control (AGC), are accounted for in the models. The null detector is formulated in a general way that encompasses many important error detector laws, including centroid and leading-edge. Both discrete-time dynam... View full abstract»

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  • Automated air defense system using knowledge-based system

    Publication Year: 1991, Page(s):118 - 124
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The proposed KAAD (knowledge-based automated air defense) system demonstrates a man-machine environment for airspace defense systems. When the unknown aircraft is hostile, a threat rating and response methods are generated by the system. It serves as a double-check decision-making system for a war control center. In addition to this application, the KAAD system can also be a useful tool as a train... View full abstract»

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  • Radar target identification of aircraft using polarization-diverse features

    Publication Year: 1991, Page(s):58 - 67
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    The characteristics and target identification potential of a representation of the information from two polarization-diverse measurements of the radar backscatter of an unknown target are considered. The locus of these two polarization-diverse waveforms, termed the transient polarization response (TPR), has been shown to be closely related to the geometry of the scattering centers of the target. T... View full abstract»

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  • An operational system implementation of the ESPIRIT DF algorithm

    Publication Year: 1991, Page(s):159 - 166
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The practical implementation of the ESPRIT algorithm into direction-finding system architecture is considered. In particular, the problems of phase ambiguity resolution for extended array separations and multidimensional azimuth/elevation estimation are addressed. Generalized solutions for these problems are proposed, and a bearing quality indicator that provides a measure of credibility associate... View full abstract»

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  • Terminal control monitor for ATC using knowledge-based system

    Publication Year: 1991, Page(s):111 - 117
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A knowledge-based system for air traffic control (ATC) in terminal control regions is designed for improving service and operation. Domain knowledge is established following rules, regulations, and comments from controllers. An expert system is adopted for approach control and airport control in the terminal control region. The proposed system was implemented in PC-AT with Turbo Prolog. The air te... View full abstract»

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  • Performance of MAX family of order-statistic CFAR detectors

    Publication Year: 1991, Page(s):48 - 57
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The MAX family of constant-false-alarm-rate (CFAR) detectors is introduced as a generalization of the greatest of CFAR (GO-CFAR) or MX mean-level detector (MX-MLD). Members of the MAX family use local estimators based on order statistics and generate both a near-range and a far-range noise-level estimate. Local estimates are always combined through a maximum operation; this insures false-alarm con... View full abstract»

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  • The hit array: an analysis formalism for multiple access frequency hop coding

    Publication Year: 1991, Page(s):30 - 39
    Cited by:  Papers (27)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    A formalism is presented for the analysis of general frequency hop waveforms, such as those suitable for use in coherent active radar and sonar echolocation systems as well as multiple-access spread-spectrum communications. This formalism is based on the concept of coincidence, or `hit', between two frequency hopping patterns. The collection of all possible hits, together with their locations, is ... View full abstract»

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  • Binary integration of fluctuating targets

    Publication Year: 1991, Page(s):11 - 17
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The detection performance of a binary integrator (M-out-of-N detector) against nonfluctuating, slowly fluctuating, and quickly fluctuating targets is given. Since the solution for the slowly fluctuating target is numerically intensive, a simpler approximate solution is developed. This approximation is very accurate and is valid even when the noise power varies from pulse to pulse... View full abstract»

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  • Maneuvering target tracking using extended Kalman filter

    Publication Year: 1991, Page(s):155 - 158
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A numerically well-conditioned, quasi-extended Kalman filter is proposed. The filter is numerically described. The simulation results presented show that the estimation performance of the quasi-extended filter is superior, for short distances, compared with the widely used linear tracking filters. In addition, the simplicity of the quasi-extended filter makes it very easy to implement View full abstract»

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  • On the rotation vector differential equation

    Publication Year: 1991, Page(s):181 - 183
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    A direct and simple derivation of the differential equation of the rotation vector is provided. The property that the time derivative of the rotation vector and the angular velocity have equal magnitude along the direction of the rotation vector is also derived View full abstract»

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  • A new system identification technique for harmonic decomposition

    Publication Year: 1991, Page(s):103 - 110
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    An extended and unifying system identification technique is presented for a class of systems that include all main signal models that arise in the harmonic decomposition problem. This technique unifies and extends the previously developed system identification techniques which are improvements on the Pisarenko harmonic decomposition (or, its spatial dual, MUSIC) as they arise in arrays of sensors.... View full abstract»

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  • A long-range laser velocimeter

    Publication Year: 1991, Page(s):125 - 138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (980 KB)

    A long-range laser velocimeter (LV) developed for remote operation from within the flow fields of large wind tunnels is described. Emphasis is placed on improvements in optical hardware as well as additions to data acquisition and processing techniques. The method used for data reduction of photon resolved signals is outlined in detail, and measurement accuracy is discussed. To study the performan... View full abstract»

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  • Calculation of probability of detection for log-normal target fluctuations

    Publication Year: 1991, Page(s):172 - 174
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    An accurate, simple, and reliable method for the computation of the probability of detection for a target whose radar cross section is constant within a scan but fluctuates log-normally scan-to-scan is presented View full abstract»

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  • A nonlinear helicopter tracker using attitude measurements

    Publication Year: 1991, Page(s):40 - 47
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Extended-Kalman-filter-based trackers are discussed for maneuvering helicopters that use body angle and rotor tip-path-plane angle measurements in addition to the usual radar position measurements. Improvements were found in tracker performance when the body rotation and rotor tip-path-plane degrees of freedom were modeled within the extended Kalman filter. Tracker performance was further improved... View full abstract»

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  • Ambiguity properties of quadratic congruential coding

    Publication Year: 1991, Page(s):18 - 29
    Cited by:  Papers (24)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    The ambiguity characteristics of multiple access frequency hop codes based on standard quadratic congruences are investigated in the light of results obtained for codes based on Costas arrays and extended quadratic congruences. While the autoambiguity properties are found to be very similar to those of Costa codes, i.e. nearly ideal, the cross-ambiguity properties of quadratic congruential codes a... View full abstract»

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  • Effectiveness of the likelihood function in logic-based track formation

    Publication Year: 1991, Page(s):184 - 187
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A logic-based track formation procedure was presented by C.B. Chang et al. (1984). In addition to the conventional gating logic, it utilized the negative log-likelihood function (goodness of fit or sum of residuals) to further reduce the false track acceptance probability. An analytical technique for the evaluation of the effectiveness of this reduction is presented. The exact solution in closed f... View full abstract»

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  • Accuracy of using point targets for SAR calibration

    Publication Year: 1991, Page(s):139 - 148
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The peak and integral methods for radiometric calibration of a synthetic aperture radar (SAR) using reference point targets are analyzed. Both calibration methods are shown to be unbiased, but the peak method requires knowledge of the equivalent rectangle system resolution which is sensitive to system focus. Exact expressions for the RMS errors of both methods are derived. It is shown that the RMS... View full abstract»

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  • On combining multidimensional target location ellipsoids

    Publication Year: 1991, Page(s):175 - 177
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    N.M. Blachman (1989) presented a method for combining the two-dimensional target location ellipses using the equation of an ellipse. A method is presented for combining N-dimensional location ellipsoids by using the location covariance matrix. The general result is formulated in simple matrix form. The results presented contain Blachman's results as a special case. Examples for both two a... View full abstract»

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  • Cross-correlation properties of algebraically constructed Costas arrays

    Publication Year: 1991, Page(s):2 - 10
    Cited by:  Papers (24)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The problem of determining the cross-correlation properties of signals based on algebraically constructed Costas arrays is addressed by examining the discrete cross-correlation of the algebraically constructed Costas arrays for a given construction and dimension. Finding two arrays that minimally correlate implies that the signals based on these arrays also minimally correlate. The properties of f... View full abstract»

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  • A modified adaptive Kalman filter for real-time applications

    Publication Year: 1991, Page(s):149 - 154
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A modified adaptive Kalman filtering algorithm is derived for the standard linear problem under an irregular environment where all variances of the zero-mean Gaussian white (system and observation) noises are unknown a priori. This algorithm has certain merits over various existing adaptive schemes in that it is simple, efficient, and suitable for real-time applications. An illustrative numerical ... View full abstract»

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  • Optimum gain control for A/D conversion using digitized I/Q data in quadrature sampling

    Publication Year: 1991, Page(s):178 - 181
    Cited by:  Papers (4)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Calculation of optimum gain for minimum distortion due to A/D (analog-to-digital) conversion requires the estimation of the input signal strength. To use a common AGC (automatic gain control) for both the I/Q (in-phase and quadrature) signals, it is efficient to estimate the input signal strength using the quantized A/D output from both channels. Assuming a Gaussian input, the relationship between... 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