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Aerospace and Electronic Systems, IEEE Transactions on

Issue 1 • Date Jan 1994

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Displaying Results 1 - 25 of 30
  • Finite data performance of MUSIC and minimum norm methods

    Publication Year: 1994 , Page(s): 161 - 174
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (864 KB)  

    In the direction of arrival (DOA) estimation problem, we encounter both finite data and insufficient knowledge of array characterization. It is therefore important to study how subspace-based methods perform in such conditions. We analyze the finite data performance of the multiple signal classification (MUSIC) and minimum norm (min. norm) methods in the presence of sensor gain and phase errors, a... View full abstract»

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  • Interlaced Kalman filtering of 3D angular motion based on Euler's nonlinear equations

    Publication Year: 1994 , Page(s): 175 - 185
    Cited by:  Papers (2)  |  Patents (35)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (724 KB)  

    A novel Kalman filtering technique is presented that reduces the mean-square-error (MSE) between three-dimensional (3D) actual angular velocity values and estimated ones by an order of magnitude (when compared with the MSE resulting from direct measurements) even under extremely low signal-to-noise ratio conditions. The filtering problem is nonlinear in nature because the dynamics of 3D angular mo... View full abstract»

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  • Steady-state analysis and design of a switched-capacitor DC-DC converter

    Publication Year: 1994 , Page(s): 92 - 101
    Cited by:  Papers (60)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (684 KB)  

    A representative switched-capacitor DC-DC converter topology is presented, circuit operation is explained, and control strategies are identified. State-space averaging is used to analyze steady-state performance and to develop control criteria and design equations. The analytical results are verified by SPICE simulation View full abstract»

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  • On-line diagnostics of a self-contained flight actuator

    Publication Year: 1994 , Page(s): 186 - 196
    Cited by:  Papers (16)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (736 KB)  

    A mathematical model describing the dynamics of a self-contained flight control actuator is established. Typical failures of the actuator are defined in the space of the model parameters in the form of a failure pattern library. A diagnostic model of the actuator, intentionally sensitive to particular failures, is defined. A diagnostic procedure, featuring on-line parameter estimation of the diagn... View full abstract»

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  • Performance evaluation of track initiation in dense target environments

    Publication Year: 1994 , Page(s): 213 - 219
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    This paper describes an analysis of track initiation performance in very high target density environments. The analysis of tracking performance performed previously by S. Mori et al. (1992) yielded very simple expressions to predict average track purity in terms of tracking parameters. These results were, however, obtained mainly for the track continuation phase in which tracks are more or less we... View full abstract»

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  • Search radar detection and track with the Hough transform. I. system concept

    Publication Year: 1994 , Page(s): 102 - 108
    Cited by:  Papers (77)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    A method of viewing search radar signals and data is described and analyzed in which the image processing technique of the Hough transform is used to extract detections and simultaneous tracks from multi-dimensional data maps. System design concepts are considered and simulation examples are given that illustrate the concept. The technique offers many advantages when compared with more traditional... View full abstract»

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  • A mean level adaptive detector using nonconcurrent data

    Publication Year: 1994 , Page(s): 258 - 265
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (472 KB)  

    Convergence results for a mean level adaptive detector (MLAD) are presented. The MLAD consists of an adaptive matched filter (for spatially correlated inputs) followed by a mean level detector (MLD). The optimal weights of the adaptive matched filter are estimated from one batch of data and applied to a statistically independent batch of nonconcurrent data. The threshold of the MLD is determined f... View full abstract»

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  • Adaptive detection using low rank approximation to a data matrix

    Publication Year: 1994 , Page(s): 55 - 67
    Cited by:  Papers (82)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (972 KB)  

    Using an accurate formula for the error in approximating a low rank component, we calculate the performance of adaptive detection based on reduced-rank nulling. In this principal component inverse (PCI) method, one temporarily regards the interference as a strong signal to be enhanced. The resulting estimate of the interference waveform is subtracted from the observed data, and matched filtering i... View full abstract»

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  • Existence and uniqueness of motion parameters in active ranging

    Publication Year: 1994 , Page(s): 18 - 29
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (896 KB)  

    Motion estimation of distributed objects is discussed. Measurements include position plus Doppler. We show that 2D position plus Doppler is sufficient to uniquely determine the motion parameters of an object on a circular trajectory except for special cases. The uniqueness enhances occlusion tolerance and implies an approach to associating features. We show that the sensitivity of calculated motio... View full abstract»

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  • ADEPTS: space-based power system management using parallel architecture

    Publication Year: 1994 , Page(s): 275 - 280
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    A serial architecture was developed which would run on a single processor and perform the functions of state estimation, unit dispatch, and load-flow. Node profiling was done on the serial architecture to check for the total time spent in calculations, input/output (I/O) communications, and internode communication. Different parallel architectures were developed and tested which also performed the... View full abstract»

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  • True proportional navigation with maneuvering target

    Publication Year: 1994 , Page(s): 229 - 237
    Cited by:  Papers (13)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (700 KB)  

    We analytically obtain the capture regions for the true proportional navigation (TPN) missile guidance law against an intelligently maneuvering target. Two versions of TPN are considered. The first is the original TPN which assumes the commanded lateral acceleration to be directly proportional to the line-of-sight (LOS) rate only, the proportionality factor being an arbitrary constant or dependent... View full abstract»

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  • Search radar detection and track with the Hough transform. II. detection statistics

    Publication Year: 1994 , Page(s): 109 - 115
    Cited by:  Papers (24)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (476 KB)  

    For pt.I see ibid., vol.30, no.1, (Jan.1994). This paper describes the calculation of PF and PD for the Hough transform technique when the primary threshold crossings are weighted by their power before transforming (i.e., noncoherent integration). After expressions for PF and PD are derived, we examine the question of optimal granularity of the Hough acc... View full abstract»

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  • Gram-Schmidt forward-backward generalized sidelobe canceller

    Publication Year: 1994 , Page(s): 151 - 160
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (684 KB)  

    Addressed here is the the discrete-time and the continuous-time recursive least-squares (RLS) modified Gram-Schmidt orthogonalization (MGSO) algorithms for forward-backward (FB) generalized sidelobe cancelling (GSC) adaptive beamformers. The FB-GSC requires processing each input data twice, forward and conjugated backward, and hence its adaptation would require a rank-two update each time. This pa... View full abstract»

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  • Steady-state analysis of the constant-frequency clamped series resonant converter

    Publication Year: 1994 , Page(s): 135 - 143
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (660 KB)  

    A constant-frequency diode-clamped series resonant converter (CFCSRC) is proposed as a solution to problems associated with frequency-controlled resonant converters. This converter has two resonant frequencies, and control is achieved by varying the relative time spent at each switching frequency. Two zero-current-switching (ZCS) modes are examined and plotted in the output plane. An equation is g... View full abstract»

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  • A sequential detection approach to target tracking

    Publication Year: 1994 , Page(s): 197 - 212
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1268 KB)  

    Sequential hypothesis testing is investigated for multiframe detection and tracking of low-observable maneuvering point-source targets in a digital image sequence. The proposed multiple multistage hypothesis test tracking (MMHTT) algorithm extends tracks formed from sequentially detected target trajectory segments using a multiple hypothesis tracking strategy. The MMHTT algorithm does not require ... View full abstract»

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  • Clutter metrics for target detection systems

    Publication Year: 1994 , Page(s): 81 - 91
    Cited by:  Papers (6)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1476 KB)  

    The problem of calculating an effective contrast for diffused targets in visual scenery is addressed. The effect of local variations of intensity in the vicinity of the target is modeled by considering the distribution of the intensity of the edges. The effect of global clutter is discussed from the vantage point of selecting the best model for background scenery. Generalized contrast measures are... View full abstract»

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  • Improved 3-D tracking using the mode-S down link

    Publication Year: 1994 , Page(s): 267 - 274
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    The use of airborne measurements to assist in three-dimensional (3-D) tracking is investigated and a simple filter is developed. This filter is derived from an earlier, flight-dynamics-based 3-D tracker, through simplifications. The performance of the simplified filter is evaluated using real data, is compared against the performance of the initial 3-D tracker and is found to be very satisfactory,... View full abstract»

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  • Ll-CFAR: a flexible and robust alternative

    Publication Year: 1994 , Page(s): 41 - 54
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (996 KB)  

    A new family of constant false alarm rate (CFAR) processors is introduced. An Ll-CFAR forms its noise power estimate by linearly filtering ranked samples from the reference set; the weights of this combination, however, depend not only on the rank, but also on the relative proximity of the sample to the cell under test. From the class of Ll-CFARs may be chosen members which effectively censor spur... View full abstract»

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  • Czech radar technology

    Publication Year: 1994 , Page(s): 2 - 17
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1948 KB)  

    Recently Czech radars have been known almost only within the previous Eastern Bloc. Tesla Pardubice, a European manufacturer of radars with more than 1200 various radars manufactured and delivered, has achieved the leading role among other radar manufacturers in Central and Eastern Europe. Radar production has been based on the company's own research and development of systems and technologies. A ... View full abstract»

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  • Modified input estimation technique using pseudoresiduals

    Publication Year: 1994 , Page(s): 220 - 228
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (640 KB)  

    An adaptive tracking filter for maneuvering targets is proposed using modified input estimation technique. Pseudoresiduals are defined using measurements and the velocity estimate at the hypothesized maneuver onset time. With the pseudoresiduals and a new target model representing transitions of nominal accelerations, a new input estimation method for tracking a maneuvering target is derived. Sinc... View full abstract»

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  • Investigation of corona initiation voltage at reduced pressures

    Publication Year: 1994 , Page(s): 144 - 150
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 KB)  

    The results of an experimental study of the 60 Hz ac corona inception voltage at reduced pressures for a cylindrical conductor and a parallel ground plane are presented. Several spacings and bare and insulated conductors of several diameters are considered. Empirical expressions from which a reasonably accurate prediction of the corona inception voltage (CIV) may be made have been inferred from ex... View full abstract»

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  • Search radar detection and track with the Hough transform. III. Detection performance with binary integration

    Publication Year: 1994 , Page(s): 116 - 125
    Cited by:  Papers (32)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (668 KB)  

    For pt.II see ibid., vol. 30, no 1, (Jan. 1994). This paper considers how well a Hough transform detector with binary integration improves the performance of a typical surveillance radar. For Hough transform detection, binary integration offers some advantages over noncoherent integration when multiple targets appear in range-time space or when the detector receives signals with a wide range of po... View full abstract»

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  • Angle of arrival estimation of coherent signals using an array doublet in motion

    Publication Year: 1994 , Page(s): 126 - 134
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (632 KB)  

    Shown here is how the estimation of signal parameters via relational invariance techniques (ESPRIT) algorithm may be used with a single pair of antennas in motion to estimate angles of arrival (AOA) for coherent signals. The approach exploits the Doppler frequency shifts caused by the doubler in motion. With this estimator, the number of signals that can be handled is not limited by the size of th... View full abstract»

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  • Broadband focusing for partially adaptive beamforming

    Publication Year: 1994 , Page(s): 68 - 80
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (844 KB)  

    A broadband adaptive beamforming approach based on the concept of signal-subspace alignment is formulated and contrasted with the conventional approach. The proposed method involves a preprocessor that focuses the signal spaces at different frequencies to a common one and a narrowband beamformer following the preprocessor. The merits that result as a consequence are partial adaptivity due to singl... View full abstract»

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  • A comparison of two adaptive detection schemes

    Publication Year: 1994 , Page(s): 30 - 40
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (700 KB)  

    Two schemes for adaptive detection are compared: Kelly's generalized likelihood ratio test (GLRT) and the mean level adaptive detector (MLAD). Detection performance, PD, is predicted for the two schemes under the assumptions that the input noises are zero-mean complex Gaussian random variables that are temporally independent but spatially correlated; and the amplitude of the desired sig... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the equipment, procedures, and techniques applicable to the organization, installation, and operation of functional systems designed to meet the high performance requirements of earth and space systems.

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory