Searched for: subject%3A%22Synthetic%255C%2Baperture%255C%2Bradar%22
(61 - 80 of 81)
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Groot, J. (author), Otten, M. (author), van Halsema, E. (author)In ground engineering the need for deformation measurements is urgent. SAR interferometry can be used to measure small (sub-wavelength) deformations. An experiment to investigate this for dike deformations was set up, using the C-band SAR system PHARUS (PHased ARray Universal SAR). This paper describes the progress made in the research.article 2000
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Gommenginger, C.P. (author), Robinson, I.S. (author), Willoughby, J. (author), Greidanus, H.S.F. (author), Taylor, V. (author), TNO Fysisch en Elektronisch Laboratorium (author)Empirical results from a field experiment in the southern North Sea have demonstrated the possibility to detect bathymetry-induced sea surface roughness modulation in the coastal zone using high frequency in-situ slope measurements provided by the Towed Laser Slopemeter. A strong correlation between enhanced/reduced slope power for ocean...conference paper 1999
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Greidanus, H.S.F. (author), Huising, E.J. (author), Platschorre, Y. (author), van Bree, R.J.P. (author), van Halsema, D. (author), Vaessen, E.M.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Digital elevation models (DEMs) are produced from airborne radar cross-track interferometric measurements. Radar DEMs recorded from perpendicular orientations are intercompared, and compared to DEMs derived from airborne laser altimetryconference paper 1999
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Greidanus, H.S.F. (author), van Bree, R.J.P. (author), Huising, E.J. (author), Vogelzang, J. (author), Vaessen, E.M.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Airborne radar along-track interferometric measurements of a coastal area with a complex tidal flow pattern are analyzed. The results are compared with a current field computed from a tidal model. Using wave-current interaction modeling, a radar backscatter image is simulated based on the measured current field, and compared to the measured...conference paper 1999
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Nijenboer, F.J. (author), Otten, M.P.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)The Dutch PHARUS system is a polarimetric active phased array SAR capable of performing advanced SAR modes. Advanced SAR modes that are being investigated are: spotlight SAR, sliding spotlight SAR, stepped frequency SAR and interferometric SAR. The flight experiments and automatic beam steering implementations are carried out in co-operation...conference paper 1999
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- TNO Fysisch en Elektronisch Laboratorium (author), Anoniem, (author) other 1999
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Bierens, L.H.J. (author), Otten, M.P.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)Describes the theoretical background of dynamic range limiting, an analog raw SAR data reduction technique. A Dynamic Range Limiter (DRL) breadboard model is presented, which has been used to prove the concept of this technique. The first results of the DRL experiment with the PHARUS airborne SAR system have shown that the DRL performs its...conference paper 1998
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Dekker, R.J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Repeat-pass Synthetic Aperture Radar (SAR) imagery is useful for change detection. A disadvantage of SAR is the system-inherent speckle noise. This can be reduced by filtering. Various filter types and methods are described in the literature, but not one fits the speckle noise in change detection imagery. A new method is therefore developed in...article 1998
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Bierens, L.H.J. (author), Deprettere, E.F. (author), TNO Fysisch en Elektronisch Laboratorium (author)We present a schematic design methodology for multirate convolution systems, based on combined algorithmic development and architecture design. It allows us to map the algebraic specification of a long convolution algorithm directly onto efficient fast convolution hardware based on short FFT processor elements or dedicated VLSI processors. The...conference paper 1996
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van Halsema, D. (author), van der Kooij, M.W.A. (author), TNO Fysisch en Elektronisch Laboratorium (author)The potential of satelliteborne interferometric measurements for the mapping of slow land subsidence has been investigated. Two test sites, covered by the E,RS-1 satellite, were selected in the Netherlands: the provinces of Groningen and Zeeland. In situ measurements on the weather and the actual subsidence were gathered. It will be shown that...conference paper 1996
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Greidanus, H.S.F. (author), Hoogeboom, P. (author), Koomen, P.J. (author), Snoeij, P. (author), Pouwels, H. (author), IEEE - Institute of Electrical and Electronics Engineers (author)PHARUS is an airborne fully polarimetric C band SAR. It uses a compact phased array antenna with electronic beam steering. Its design provides for a flexible and robust system concept, suited for operational use on small aircraft. PHARUS was developed in The Netherlands to cater for both the military and civil markets. Its development was...conference paper 1996
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Zwartenkot, H.T.J. (author), Boerrigter, M.J.G. (author), Bierens, L.H.J. (author), Smit, J. (author), TNO Fysisch en Elektronisch Laboratorium (author)Usually, long convolutions are computed by programmable DSP boards using long FFTs. Typical operational requirements such as minimum power dissipation, minimum volume and high dynamic range/accuracy, make this solution often inefficient and even unacceptable. In this paper we present a single chip floating point solution for large convolution...conference paper 1996
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TNO Fysisch en Elektronisch Laboratorium (author), Hoogeboom, P. (author), Dekker, R.J. (author), Otten, M.P.G. (author)Synthetic Aperture Radar (SAR) is today a valuable source of remote sensing information. SAR is a side-looking imaging radar and operates from airborne and spacebome platforms. Coverage, resolution and image quality are strongly influenced by the platform. SAR processing can be performed on standard computers or dedicated hardware architectures,...conference paper 1996
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Hoogeboom, P. (author), TNO Fysisch en Elektronisch Laboratorium (author)This paper, presented in poster form addresses the use of radar remote sensing in coastal zone management. Current and future applications in The Netherlands are highlighted with an outlook to technology and models that are involved. Applications include monitoring of the environment, oil spills, shipping, bottomtopography, coastal erosion. In...conference paper 1995
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van den Broek, A.C. (author), Rijckenberg, G.J. (author), Davidson, M. (author), Freeman, A. (author), TNO Fysisch en Elektronisch Laboratorium (author)We compared polarimetric C- and L-band and ground truth data from bare soil, young wheat and mature maize fields of the agricultural test site Flevoland in the Netherlands collected during the SIR-C campaign in April and October 1994. We find that the L-band is more sensitive to the soil roughness than the C-band. In particular L-band HH gives...conference paper 1995
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- TNO Fysisch en Elektronisch Laboratorium (author), Bierens, L.H.J. (author), van Heijster, R.M.E.M. (author), van Bezouwen, J.P. (author) conference paper 1994
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Hoogeboom, P. (author), Koomen, P.J. (author), Snoeij, P. (author), Pouwels, H. (author)The PHARUS project (PHARUS stands for Phased Array Universal SAR) aims for a polarimetric C-band aircraft SAR that will be finalized in 1994. The system will make use of a phased array antenna with solid state amplifiers. The project consists of two phases, a definition phase and a realization phase. The definition phase was intended to increase...conference paper 1992
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Pouwels, H. (author), Hoogeboom, P. (author), Koomen, P.J. (author), Snoeij, P. (author)The Dutch PHARUS project aims for the developrlenÈ of a polarimetric C-band aircraft SAR, to be finalized in 1994. The PHARUS systen consists of three subsystens: the radar, the subsystem for the onboard data processing and recording and the ground-based subsystem for SAR processing. PHARUS is a very flexible system with numerous operating modes...conference paper 1992
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Hoogeboom, P. (author), Koomen, P.J. (author), Pouwels, H. (author), Snoeij, P. (author)In The Netherlands a plan to design aircraft and build a polarimetric C-band SAR system of a novel design, called PHARUS (PHased Array Universal SAR) is carried out by three institutes. These institutes are the Physics and Electronics Laboratory TNO in The Hague (prime contractor and project management), The National Aerospace Laboratory NLR in...conference paper 1990
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Hoogeboom, P. (author), Koomen, P.J. (author)In The Netherlands a digital SLAR system (X-band) is used since many years remote sensing in radar remote sensing research. An example of results and the system's key features are given in this paper. Calibration and high geometric and radiometric accuracy were the keywords to success in remote sensing for this system. Based on this experience a...conference paper 1989
Searched for: subject%3A%22Synthetic%255C%2Baperture%255C%2Bradar%22
(61 - 80 of 81)