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Proceedings of the 2002 IEEE Radar Conference (IEEE Cat. No.02CH37322)

25-25 April 2002

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  • Proceedings of the 2002 IEEE Radar Conference (IEEE Cat. No.02CH37322)

    Publication Year: 2002
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    Freely Available from IEEE
  • Author index

    Publication Year: 2002, Page(s):507 - 508
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    Freely Available from IEEE
  • Clutter patch identification based on Markov random field models

    Publication Year: 2002, Page(s):464 - 470
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB) | HTML iconHTML

    This paper addresses the problem of clutter patch identification based on Markov random field (MRF) models. MRF has long been recognized by the image processing community to be an accurate model to describe a variety of image characteristics such as texture. Here, we use the MRF to model clutter patch characteristics, captured by a radar receiver or radar imagery equipment, due to the fact that cl... View full abstract»

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  • SAR-MTI processing of multi-channel airborne radar measurement (MCARM) data

    Publication Year: 2002, Page(s):24 - 28
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB) | HTML iconHTML

    This paper addresses the problem of developing signal processing, moving target detection, and image formation algorithms, for an airborne array radar system, called Multi-Channel Airborne Radar Measurement (MCARM), developed by the Air Force Research Laboratory at Rome, New York. Our approach is based on interpreting the MCARM data via a multichannel SAR system. SAR imaging and blind calibration ... View full abstract»

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  • Application of polarimetric synthetic aperture radar interferometry for land cover classification

    Publication Year: 2002, Page(s):459 - 463
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB) | HTML iconHTML

    The development of radar polarimetry and radar interferometry is advancing rapidly. The textural fine structure, target orientation, system metrics and material constituents can be recovered with radar polarimetry; while with radar interferometry, the elevation structure of a target can be explored. Polarimetric synthetic aperture radar interferometric (Pol-InSAR) is interferometry between all pos... View full abstract»

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  • Multipath signal recovery in the presence of very large noise

    Publication Year: 2002, Page(s):18 - 23
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB) | HTML iconHTML

    In this paper, we present a method for resolving a return multipath signal in the presence of very large noise. The method basically consists of choosing a function, whose correlation with the transmitted signal is either zero, or of an easily analyzed form. Hence, correlating such a function with the received signal will single out the noise component. An interesting feature of our approach is th... View full abstract»

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  • Northrop Grumman radar simulation (AVSIM)

    Publication Year: 2002, Page(s):176 - 186
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2154 KB) | HTML iconHTML

    The Northrop Grumman avionics simulation (AVSIM) is one of a set of simulations focused on fighter class radars. It is designed to support a variety of analysis and development activities, spanning requirements analysis, radar software development, performance evaluation and pilot interfaces. This paper describes AVSIM and the simulation architecture that surrounds it. The model provides high fide... View full abstract»

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  • Frequency estimation of the sinusoidal signals with unknown lowpass envelopes based on the eigenanalysis

    Publication Year: 2002, Page(s):453 - 458
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (446 KB) | HTML iconHTML

    In this paper, the frequency estimation of the sinusoidal signals with unknown lowpass envelope is addressed. Due to mismodeling, the performance of the conventional subspace-based method degrades significantly in these cases. By developing the method applied to the parametric localization of distributed sources, an eigenanalysis-based method is proposed for the frequency estimate. The comparisons... View full abstract»

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  • Frequency estimation accuracy of ROCKET

    Publication Year: 2002, Page(s):14 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    We assess the frequency estimation accuracy of the recently introduced reduced rank autoregressive linear predictor called reduced order correlation kernel estimation technique (ROCKET). We compare the frequency estimation performance of ROCKET to both the conventional full rank autoregressive (FR-AR) method and the theoretical limit imposed by the Cramer-Rao bound (CRB). The analysis includes est... View full abstract»

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  • Radar breadboard for DSP scatterometer

    Publication Year: 2002, Page(s):168 - 175
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1560 KB) | HTML iconHTML

    The design and test results for the radio frequency (RF) portion of a breadboard polarimetric scatterometer operating at 13.402 GHz are presented. To evaluate the feasibility of a programmable digital signal processing (DSP) approach for a follow-on scatterometer similar to SeaWinds an integrated breadboard has been developed at the Jet Propulsion Laboratory (JPL). Early breadboards of this type h... View full abstract»

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  • Deconvolution approach to terrain scattered interference mitigation

    Publication Year: 2002, Page(s):344 - 349
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB) | HTML iconHTML

    Terrain scattered interference or hot clutter is a problem in radar ECCM, especially for airborne radar with low sidelobe antennas and conventional adaptive sidelobe cancellation. A deconvolution approach is proposed to mitigate terrain scattered interference. This approach is based on obtaining an estimate of the complex multipath impulse response from a short time interval in the received signal... View full abstract»

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  • Entropy based phase calibration of antenna arrays for digital beamforming remote sensing radars

    Publication Year: 2002, Page(s):445 - 452
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (861 KB) | HTML iconHTML

    A minimum entropy based calibration algorithm for digitally beamformed imaging radars is presented. The algorithm is derived from work in SAR which corrects phase errors due to platform motion. The performance of the algorithm is compared to traditional techniques through both simulations and data from two imaging radars. The algorithm performs well with similar sidelobe levels for a point target.... View full abstract»

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  • Optimal classification of polarimetric SAR images using segmentation

    Publication Year: 2002, Page(s):8 - 13
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB) | HTML iconHTML

    The paper presents an optimised polarimetric segmentation technique for synthetic aperture radar (SAR) images, based on a generalised maximum likelihood approach. A full theoretical derivation is presented, together with a closed form analytical performance evaluation. The technique is compared to other known polarimetric segmentation schemes by application to a polarimetric SAR image of agricultu... View full abstract»

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  • Generation of rejection method bounds for spherically invariant random vectors

    Publication Year: 2002, Page(s):41 - 47
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (506 KB) | HTML iconHTML

    Based upon the central limit theorem, random clutter returns are commonly modeled as Gaussian. Nevertheless, many situations arise in practice where the data are clearly non-Gaussian, as is seen with "spiky" radar clutter. Spherically invariant random vectors (SIRVs) are especially attractive for modeling correlated non-Gaussian clutter. This paper discusses the computer simulation of SIRVs for Mo... View full abstract»

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  • Frequency coded waveforms for enhanced delay-Doppler resolution

    Publication Year: 2002, Page(s):160 - 167
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB) | HTML iconHTML

    In this research, we propose techniques for the construction of frequency coding sequences that give rise to frequency coded waveforms having ambiguity functions with a clear area-containing no sidelobes-in a connected region surrounding the main lobe. In this sense, the proposed sequences have excellent delay-Doppler resolution properties and achieve locally optimal ambiguity functions in the reg... View full abstract»

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  • SAR image formation uncorrupted by multiple-bounce artifacts

    Publication Year: 2002, Page(s):338 - 343
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (701 KB) | HTML iconHTML

    This analysis develops an innovative image reconstruction technique for synthetic aperture radar (SAR) based upon the removal of multiple-bounce (MB) artifacts. The basic concept is that the phase history measurements include the realistic effects of MB interactions. These measured phase history data are decomposed into contributions due to the desired single-bounce (SB) scattering events and the ... View full abstract»

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  • Bistatic reflectivity measurements on various terrains at X, Ku, Ka and W-band frequencies

    Publication Year: 2002, Page(s):266 - 271
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (541 KB) | HTML iconHTML

    Data that realistically represent the phenomenology of bistatic reflectivity are essential to the design of radar systems intended to sense land based targets and low flying aircraft. A need exists to further characterize clutter phenomenology in order to design and project the performance of current and future systems. This paper provides an overview of X, Ku, Ka and W-band bistatic measurements ... View full abstract»

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  • Analytical and computer model of a Doppler weather radar system

    Publication Year: 2002, Page(s):438 - 444
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB) | HTML iconHTML

    With advances in Doppler weather radar, severe storm and tornado detection has improved greatly. However, the resolution limitations of deployed radar systems can still limit severe storm detection. In the case of larger tornadoes, characteristic abrupt changes in wind direction can usually be detected between adjacent range-angle bins. However for smaller tornadoes, the rotating cell may be conta... View full abstract»

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  • STAP with angle-Doppler compensation for bistatic airborne radars

    Publication Year: 2002, Page(s):311 - 317
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (597 KB) | HTML iconHTML

    We study issues associated with applying space-time adaptive processing (STAP) techniques in bistatic airborne applications. We consider the performance of several STAP approaches in different scenarios. Specific consideration is given to the effects of bistatic clutter spectral dispersion on covariance estimation and the algorithm's resulting clutter rejection capability. Our prime focus emphasiz... View full abstract»

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  • Digital local-oscillator generation using a delta-sigma technique

    Publication Year: 2002, Page(s):129 - 134
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (523 KB) | HTML iconHTML

    Local-oscillator (LO) signals in up/down converters for most radar systems are typically generated using synthesizers, bench sources, custom-built frequency sources or direct-digital synthesis (DDS). In a digital-array radar (DAR) concept, a single-bit delta-sigma (Δ-Σ) technique is considered as a viable alternative to encode sine waves digitally for LO signal generation. This techniq... View full abstract»

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  • Bistatic STAP: application to airborne radar

    Publication Year: 2002, Page(s):1 - 7
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (661 KB) | HTML iconHTML

    We investigate bistatic STAP performance. We show that typical bistatic clutter environments appear nonstationary. Nonstationary behavior exacerbates STAP implementation. In the absence of corrective measures, SINR losses due to covariance estimation error approaches 30 dB for the numerical examples considered herein. Using localized STAP processing coupled with a time-varying weight procedure, we... View full abstract»

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  • MATLAB simulation for computing probability of detection

    Publication Year: 2002, Page(s):478 - 483
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (523 KB) | HTML iconHTML

    This paper presents a MATLAB simulation that computes the probability of detection for a radar. It allows the user to input a wide range of radar characteristics. The target detection method has the capacity for handling fluctuating targets. This is important because actual targets are observed to scintillate and the probability of detection decreases as the signal-to-noise ratio decreases. This p... View full abstract»

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  • A new complementary waveform technique for radar signals

    Publication Year: 2002, Page(s):35 - 40
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB) | HTML iconHTML

    A new phase coding technique for radar signals is introduced which uses novel complementary waveforms constructed to have optimal sidelobe performance. The waveforms are constructed using a modification of the Prometheus orthonormal set (PONS) technique. An advantage of a PONS matrix is that it allows for many complementary pairs of waveforms to choose from as well as allowing for multiple pairs t... View full abstract»

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  • An improved RDM method specially useful for low cost SAR high squint processing

    Publication Year: 2002, Page(s):194 - 199
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB) | HTML iconHTML

    A new squint dependent formulation of the known reflectivity displacement method (RDM) for motion error extraction is presented. This new formulation extends RDM applicability under high squint angles with a negligible computational overload. The data obtained is suitable for high quality synthetic aperture radar (SAR) processing with motion compensation avoiding the use of expensive inertial navi... View full abstract»

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  • A lower confidence limit for the number of signals

    Publication Year: 2002, Page(s):356 - 361
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB) | HTML iconHTML

    We propose a multi-step procedure for constructing a lower confidence limit for the number of signals present. We derive the probability of a correct estimation, P(CE), and the least favorable configuration (LFC) for our procedure. Under LFC, the P(CE) attains its minimum over the parameter space of all eigenvalues. Therefore a minimum sample size can be determined in order to implement our proced... View full abstract»

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