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Aerospace and Electronic Systems, IEEE Transactions on

Issue 3 • Date July 1997

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Displaying Results 1 - 25 of 39
  • Doppler ambiguity resolution using multiple PRF

    Publication Year: 1997 , Page(s): 738 - 751
    Cited by:  Papers (16)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2082 KB)  

    An algorithm for velocity ambiguity resolution in coherent pulsed Doppler radar using multiple pulse repetition frequencies (PRF) is presented. It relies on the choice of particular values for the PRFs. The folded frequency of the target signal is obtained by averaging the folded frequency estimates for each PRF, and a quasi maximum likelihood criterion is maximized for ambiguity order estimation.... View full abstract»

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  • Fuzzy logic applications to multisensor-multitarget correlation

    Publication Year: 1997 , Page(s): 752 - 769
    Cited by:  Papers (24)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (4376 KB)  

    A consistent tactical picture requires data fusion technology to combine and propagate information received from diverse objects and usually vague situations. The information may be contained in two types of data; numerical data received from sensor measurements, and linguistic data obtained from human operators and domain experts. In real world situations, the numerical data may be noisy, inconsi... View full abstract»

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  • Geolocation of a known altitude object from TDOA and FDOA measurements

    Publication Year: 1997 , Page(s): 770 - 783
    Cited by:  Papers (27)  |  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1387 KB)  

    Most satellite systems for locating an object on Earth use only time difference of arrival (TDOA) measurements. When there are relative motions between an emitter and receivers, frequency difference of arrival (FDOA) measurements can be used as well. Often, the altitude of an object is known (it is zero, for example) or can be measured with an altimeter. Two sets of geolocation solutions are propo... View full abstract»

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  • Detection of chi-square fluctuating targets in arbitrary clutter

    Publication Year: 1997 , Page(s): 784 - 794
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1587 KB)  

    In a recent paper, general expressions were derived for the density and cumulative probability functions of the amplitude of a linear matched-filter output given a nonfluctuating target in a clutter-limited environment. These expressions were based on the clutter amplitude density function. The results are extended to calculate the cumulative probability function of the output of a linear matched ... View full abstract»

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  • Extracting multiple frequencies from phase-only data

    Publication Year: 1997 , Page(s): 795 - 801
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1259 KB)  

    The problem of extracting multiple frequencies from phase-only data is addressed. Multiple frequency estimation is accomplished by reconstructing the Fourier transform of the complex-valued time signal and then finding peaks in the frequency domain. We present a set of conditions under which a discrete-time complex sequence can be completely specified by its phase-only information. Two candidate m... View full abstract»

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  • Automatic stereo processing of high resolution radar imagery

    Publication Year: 1997 , Page(s): 802 - 812
    Request Permissions | Click to expandAbstract | PDF file iconPDF (7826 KB)  

    Previously reported experiments with stereoscopic viewing of high resolution radar pictures demonstrated improvements in detection sensitivity up to 7 dB. This paper presents continued research into automatic algorithmic techniques for employing stereo information. A simple two-stage model for a human observer is proposed, and here we investigate the utility of an existing automatic stereo process... View full abstract»

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  • TMA from bearings and multipath time delays

    Publication Year: 1997 , Page(s): 813 - 824
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1368 KB)  

    A novel approach for target motion analysis (TMA), which uses conventional passive bearing together with multipath time-delay measurements is examined. This so-called "Multipath TMA" offers two tactical advantages over the classical bearings-only TMA: no requirement for any ownship maneuver, and a good performance in terms of estimation error achieved in a shorter time. Both known and unknown mult... View full abstract»

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  • Detection and range/Doppler estimation for colocated sensors

    Publication Year: 1997 , Page(s): 825 - 834
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1488 KB)  

    The problem of multisensor detection and high resolution signal state estimation using joint maximum a posteriori detection and high order nonlinear filtering techniques is addressed. The model-based fusion approach offers the potential for increased target resolution in range/Doppler/azimuth space. The approach employs joint detection/estimation filters (JDEF) for target detection and localizatio... View full abstract»

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  • Optimal nonlinear filtering in GPS/INS integration

    Publication Year: 1997 , Page(s): 835 - 850
    Cited by:  Papers (38)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1754 KB)  

    The application of optimal nonlinear/non-Gaussian filtering to the problem of INS/GPS integration in critical situations is described. This approach is made possible by a new technique called particle filtering, and exhibits superior performance when compared with classical suboptimal techniques such as extended Kalman filtering. Particle filtering theory is introduced and GPS/INS integration simu... View full abstract»

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  • Optimizing Murty's ranked assignment method

    Publication Year: 1997 , Page(s): 851 - 862
    Cited by:  Papers (16)  |  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2243 KB)  

    We describe an implementation of an algorithm due to Murty for determining a ranked set of solutions to assignment problems. The intended use of the algorithm is in the context of multitarget tracking, where it has been shown that real-time multitarget tracking is feasible for some problems, but many other uses of the algorithm are also possible. The following three optimizations are discussed: (1... View full abstract»

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  • Bias compensation and tracking with monopulse radars in the presence of multi path

    Publication Year: 1997 , Page(s): 863 - 882
    Cited by:  Papers (17)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2029 KB)  

    The problem of tracking targets in the presence of reflections from sea or ground is addressed. Both types of reflections (specular and diffuse) are considered. Specular reflection causes large peak errors followed by an approximately constant bias in the monopulse ratio, while diffuse reflection has random variations which on the average generate a bias in the monopulse ratio. Expressions for the... View full abstract»

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  • Multiple hypothesis track maintenance with possibly unresolved measurements

    Publication Year: 1997 , Page(s): 883 - 892
    Cited by:  Papers (57)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1179 KB)  

    In surveillance problems dense clutter/dense target situations call for refined data association and tracking techniques. In addition, closely spaced targets may exist which are not resolved. This phenomenon has to be considered explicitly in the tracking algorithm. We concentrate on two targets which temporarily move in close formation and derive a generalization of MHT methods on the basis of a ... View full abstract»

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  • Effects of ionospheric scintillation on differential demodulation of GPS data

    Publication Year: 1997 , Page(s): 893 - 902
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    Global Positioning System (GPS) receivers that must operate under fading propagation conditions can use differential phase-shift keying (DPSK) and reference bits to reliably demodulate GPS data. The demodulation performance of such receivers is analyzed for nonfading and Rayleigh fading channels. Theoretical results derived here are compared with measured error rates taken during scintillation tes... View full abstract»

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  • MMAE/MMAC control for bending with multiple uncertain parameters

    Publication Year: 1997 , Page(s): 903 - 912
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1542 KB)  

    A moving-bank multiple model estimator/controller (MMAE/MMAC) based on linear system, quadratic cost, and Gaussian noise (LQG) assumptions is used to quell unwanted vibrations in a simulated large flexible space structure. The structure, known as the Space Integrated Controls Experiment (SPICE), exists at Phillips Laboratory, Kirtland Air Force Base, New Mexico. The structure consists of a large p... View full abstract»

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  • PWM converter with low stresses and zero capacitive turn-on losses

    Publication Year: 1997 , Page(s): 913 - 920
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1513 KB)  

    A buck converter operating at constant switching frequency, whose active switches and recovery diode commutate at zero-voltage-switching (ZVS), with zero capacitive turn-on losses, is proposed. By using the parasitic capacitances of the switches as resonant capacitors, multiresonance is created. The resonant stage takes place only after the resonant inductor has been discharged, thus avoiding a re... View full abstract»

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  • Detecting near collisions for satellites

    Publication Year: 1997 , Page(s): 921 - 929
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (775 KB)  

    A highly efficient algorithm is presented for detecting near collisions involving satellites. Rather than examine all possible pairings of a satellite with another orbiting object, the new approach examines trajectories at a sequence of coarse time steps. Objects which are spatially isolated cannot be involved in a collision, and are discarded. The time steps, orbit calculations, and discarding ar... View full abstract»

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  • A maximum power transfer battery charger for electric vehicles

    Publication Year: 1997 , Page(s): 930 - 938
    Cited by:  Papers (7)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1466 KB)  

    A battery charger is described that uses an on-line microcontroller to maximize its output power. This is done by always operating at either the maximum allowable input current or the thermal limit imposed by the charger itself. In this case the thermal limit is determined by the junction temperatures of the two main insulated gate bipolar transistors (IGBTs). Since direct measurement of these tem... View full abstract»

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  • Frequency-controlled series-resonant converter with synchronous rectifier

    Publication Year: 1997 , Page(s): 939 - 948
    Cited by:  Papers (20)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2070 KB)  

    This paper presents an analysis and experimental results for a frequency-controlled series-resonant dc-dc converter that consists of a Class-D zero-voltage-switching (ZVS) series-resonant inverter and a center-tapped synchronous rectifier. If the dc output voltage is low, the efficiency of the converter is dominated by the efficiency of the rectifier. Low on-resistance metal-oxide-semiconductor fi... View full abstract»

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  • Optimal pure proportional navigation for maneuvering targets

    Publication Year: 1997 , Page(s): 949 - 957
    Cited by:  Papers (13)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1358 KB)  

    The optimal pure proportional navigation (PPN) guidance law with time-varying navigation gains is considered. Unlike the conventional optimal PPN approach where linearized model was assumed in the optimization process, this work exploits the exact nonlinear formulation of PPN to derive analytically the optimal time trajectory of the navigation gain to minimize a performance index which is a weight... View full abstract»

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  • A relative navigation system for formation flight

    Publication Year: 1997 , Page(s): 958 - 967
    Cited by:  Papers (8)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1329 KB)  

    A relative navigation system based on both the Inertial Navigation System (INS) and the Global Positioning System (GPS) is developed to support situational awareness during formation flight. The architecture of the system requires an INS/GPS integration across two aircraft via a data link. A fault-tolerant federated filter is used to estimate the relative INS errors based on relative GPS measureme... View full abstract»

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  • Development of GPS-based attitude determination algorithms

    Publication Year: 1997 , Page(s): 968 - 976
    Cited by:  Papers (16)  |  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2687 KB)  

    This paper describes two Global Positioning System (GPS) based attitude determination algorithms which contain steps of integer ambiguity resolution and attitude computation. The first algorithm extends the ambiguity function method to account for the unique requirement of attitude determination. The second algorithm explores the artificial neural network approach to find the attitude. A test plat... View full abstract»

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  • Eigenanalysis for interference cancellation with minimum redundancy array structure

    Publication Year: 1997 , Page(s): 977 - 988
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (436 KB)  

    In a previous work, the principles of the eigenanalysis method for interference cancellation was studied for uniform regular array (URA) structure, wherein the array elements are equally spaced. The main objective of this paper is to extend the results of that work to adaptive arrays with different geometry termed "minimum redundancy array" (MRA). An efficient method is presented to solve the mini... View full abstract»

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  • Asymptotic distribution of the conditional signal-to-noise ratio in an eigenanalysis-based adaptive array

    Publication Year: 1997 , Page(s): 988 - 997
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (358 KB)  

    The statistical characterization of the conditioned signal-to-noise ratio (SNR) of the sample matrix inversion (SMI) method has been known for some time. An eigenanalysis-based detection method, referred to as the eigencanceler, has been shown to be a useful alternative to SMI, when the interference has low rank. In this work, the density function of the conditioned SNR is developed for the eigenc... View full abstract»

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  • Blind identification and separation of convolutively mixed independent sources

    Publication Year: 1997 , Page(s): 997 - 1002
    Request Permissions | Click to expandAbstract | PDF file iconPDF (130 KB)  

    A trispectra method for solving the m-input n-output (n≥m) wideband blind identification and signal separation problem with unknown number of sources m is presented. The method is universal in the sense that it does not impose any restriction on the probability distribution of the input signals provided that they are non-Gaussian. A criterion, which states a sufficient condition for identificat... View full abstract»

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  • Optimal number of phased array faces and signal processors for horizon surveillance

    Publication Year: 1997 , Page(s): 1002 - 1006
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (243 KB)  

    The problem of the optimal number of phased array faces for performing 360° horizon surveillance is considered. Assuming the detection performance is the same in all beam positions and the total number of T/R modules is constant, it is shown that the optimal number of array faces is three. This is true whether the arrays are operating simultaneously or sequentially. A parametric analysis is pe... 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