Searched for: subject%3A%22Synthetic%255C%2Baperture%255C%2Bradar%22
(41 - 60 of 81)
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Smith, A.J.E. (author), Chesworth, J. (author), Greidanus, H. (author), TNO Defensie en Veiligheid (author)A ship detection algorithm is developed that uses Envisat ASAR imagery in alternating polarisation mode. From airborne data it is shown that of the two co-polarisations, HH is preferred over VV because of a larger ship-to-clutter ratio. Combining the HH and HV images of alternating polarisation mode, it is found that the correlation between the...conference paper 2005
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Llombart, N. (author), Neto, A. (author), Gerini, G. (author), de Maagt, P. (author), TNO Defensie en Veiligheid (author)In a companion paper [1] presented in this same conference, the use of Planar Circularly Symmetric (PCS) Electromagnetic Band-Gap (EBG) structures for optimizing the performances of single antenna elements is discussed. A completely planar antenna with 20% of bandwidth which does not suffer from surface wave effects is presented. The key...conference paper 2005
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Llombart, N. (author), Neto, A. (author), Gerini, G. (author), de Maagt, P. (author), TNO Defensie en Veiligheid (author)In a companion paper [1] presented in this same conference, the use of Planar Circularly Symmetric (PCS) Electromagnetic Band-Gap (EBG) structures for optimizing the performances of single antenna elements is discussed. A completely planar antenna with 20% of bandwidth which does not suffer from surface wave effects is presented. The key...conference paper 2005
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TNO Defensie en Veiligheid (author), Meta, A, (author), Lorga, J.F.M. (author), de Wit, J.J.M. (author), Hoogeboom, P. (author)Airborne synthetic aperture radar is a promising new application for FM-CW radars. At the IRCTR, an operational demonstrator system has been developed in order to investigate the practicability of FM-CW SAR and to prove that an FM-CW SAR system can be operated in an efficient manner from a small platform. The platform used to fly the...conference paper 2005
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Groot, J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Due to extremely high water levels or extremely dry periods, river dikes can deform and eventually burst. The deformation can be measured with repeat-pass synthetic aperture radar (SAR) interferometry. Two flights (5.5-day interval) with an airborne C-band SAR were carried out to verify a particular case. During the second flight, the dike was...article 2004
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Lorga, J.F.M. (author), van Rossum, W.L. (author), van Halsema, D. (author), Chu, Q.P. (author), Mulder, J.A. (author)In this paper, the authors propose to describe the development process of a navigation system, concerning Syntectic Aperture Radar (SAR) applications, starting from the motivation for the sensor selection and finalizing with the first flight-test results. Sensors selection was one of the first steps in the design. Motivations for the...conference paper 2004
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Greidanus, H. (author), Clayton, P. (author), Indregard, M. (author), Staples, G. (author), Suzuki, N. (author), Vachon, P. (author), Wackerman, C. (author), Tennvassas, T. (author), Mallorqui, J. (author), Kourti, N. (author), Ringrose, R. (author), Melief, H. (author), TNO Fysisch en Elektronisch Laboratorium (author)The performances of eight satellite SAR ship detection systems (most of them operational) are compared, by running a benchmark test on RADARSAT images of various modes. No single system is best under all circumstances.conference paper 2004
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van den Broek, A.C. (author), Smith, A.J.E. (author), Toet, A. (author), TNO Fysisch en Elektronisch Laboratorium TNO Technische Menskunde (author)A study is presented in which several representations of polarimetric SAR data were evaluated for the purpose of obtaining land use classification. Two methods comprising visual interpretation and an automatic procedure were used. For the study, fully polarimetric SAR data with a resolution of 3m were obtained with the Dutch PHARUS sensor from a...article 2004
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Dekker, R.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)In single-band and single-polarized synthetic aperture radar (SAR) image classification, texture holds useful information. In a study to assess the map-updating capabilities of such sensors in urban areas, some modern texture measures were investigated. Among them were histogram measures, wavelet energy, fractal dimension, lacunarity, and...article 2003
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Smith, A.J.E. (author)When utilizing knowledge of the spacecraft trajectory for near real-time geocoding of Synthetic Aperture Radar (SAR) images, the main problem is that predicted satellite orbits have to be used, which may be in error by several kilometres. As part of the development of a Dutch autonomous mobile ground station to receive and process satellite SAR...article 2003
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Dekker, R.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)In SAR image classification texture holds useful information. In a study after the ability of texture to discriminate urban land-cover, a set of measures was investigated. Among them were histogram measures, wavelet energy, fractal dimension, lacunarity and semivariograms. The latter were chosen as an alternative for the well known gray-level...conference paper 2003
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TNO Fysisch en Elektronisch Laboratorium (author), Steeghs, T.P.H. (author), Gelsema, S.J. (author)The use of ISAR imagery for Automatic Target Recognition is seriously hampered by the difficulty of target motion compensation. Phase perturbations that result from target maneuvers during the processing interval need to be corrected for. In a previous paper, we demonstrated the use of the local Radon transform for estimating the radial velocity...conference paper 2003
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Meta, A. (author), Hoogeboom, P. (author)Combining frequency modulated continuous wave (FM-CW) teehnology with synthetic aperture radar (SAR) methods leads to a cost-effective, high resolution imaging radar for smallscale applications. There is a growing interest in miniaturized versions of such sysfems. The radar delivers its output in the frequency domain rather then in the time...conference paper 2003
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de Wit, J.J.M. (author), Hoogeboom, P. (author)Compact FM-CW technology combined with high resolution SAR techniques should pave the way for a small and cost effective imaging radar. A research project has been inìtiated to investigate the feasibility of FM-CW SAR. Within the framework of the project an operational airborne FM-CW SAR demonstrator is being implemented. Furthermore, a detailed...conference paper 2003
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Greidanus, H.S.F. (author), Otten, M.P.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)Polarimetric SAR imagery of a coastal scene is discussed, in terms of polarimetric and kinematic properties of waves on the sea and breaking waves in the surf zone. The coastal zone is a dynamic environment, and there is an increasing demand for monitoring it. Remote sensing can be an economic solution, and this paper explores some possibilities...conference paper 2002
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Steeghs, P. (author), Kester, L. (author), Gelsema, S. (author)The use of the Radon transform and the Wigner-Radon power spectrum for ISAR motion compensation is described. It is shown that the local Radon power spectrum is closely related to the Cohen's class of quadratic time-frequency representations in a similar way as the Radon and Fourier transform are related. The peak of the local Radon transform is...conference paper 2002
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TNO Fysisch en Elektronisch Laboratorium (author), Smith, A.J.E. (author)At present, gas pipeline networks in Europe are routinely monitored by vehicle and air patrols to protect them against damage by soil movement and third part interference. Because of the expenses, pipeline operators are investigating the possibilities to replace these traditional monitoring methods by remote sensing from space. A preliminary...conference paper 2002
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de Wit, J.J.M. (author), Hoogeboom, P. (author)For small-scale earth observation applications, there ia a special interest in low-cost, high-resolution imaging radars small, enough to be operated from small, possibly unmanned aircraft. The combination of FM-CW technology and the high resolution of SAR systems should result in such a small, cost-effective imaging radar. In a new project the...conference paper 2001
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- Dekker, R. (author) conference paper 2000
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TNO Fysisch en Elektronisch Laboratorium (author), Dekker, R.J. (author), van den Broek, A.C. (author)Target detection and recognition using polarimetric SAR data has been studied by using PHARUS and RAMSES data collected during the MIMEX campaign. Additionally very high-resolution ISAR data was used. A basic detection and recognition scheme has been developed, which includes polarimetric speckle-filtering, CFAR detection and the extraction of...conference paper 2000
Searched for: subject%3A%22Synthetic%255C%2Baperture%255C%2Bradar%22
(41 - 60 of 81)