Searched for: subject%3A%22Frequency%255C%2Bmodulation%22
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Meta, A. (author), Hoogeboom, P. (author), Ligthart, L.P. (author)
The combination of Frequency Modulated Continuous Wave (FMCW) technology and Synthetic Aperture Radar (SAR) leads to lightweight, cost-effective imaging sensors of high resolution. In FMCW SAR applications the conventional stop-and-go approximation used in pulse radar algorithms can be not valid anymore, therefore the motion within the sweep...
conference paper 2006
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de Wit, J.J.M. (author), Meta, A. (author), Hoogeboom, P. (author), TNO Defensie en Veiligheid (author)
The combination of compact frequency-modulated continuous-wave (FM-CW) technology and high-resolution synthetic aperture radar (SAR) processing techniques should pave the way for the development of a lightweight, cost-effective, high-resolution, airborne imaging radar. Regarding FM-CW SAR signal processing, the motion during the transmission of...
article 2006
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TNO Defensie en Veiligheid (author), Meta, A. (author), Hoogeboom, P. (author), Ligthart, L.P. (author)
This paper presents a novel approach for processing data acquired with Frequency Modulated Continuous Wave (FMCW) dechirp-on-receive systems by using a non-linear frequency scaling algorithm. The range frequency non-linearity correction, the Doppler shift induced by the continuous motion and the range migration removal are performed at the same...
conference paper 2006
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Meta, A. (author), Hoogeboom, P. (author), TNO Defensie en Veiligheid (author)
For airborne earth observation applications, there is a special interest in lightweight, cost effective, imaging sensors of high resolution. The combination of Frequency Modulated Continuous Wave (FMCW) technology and Synthetic Aperture Radar (SAR) techniques can lead to such a sensor. In this paper, a developed algorithm for SAR imaging that...
conference paper 2005
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Nekrasov, A. (author), Hoogeboom, P. (author), TNO Defensie en Veiligheid (author)
A Ka-band backscatter model and an algorithm for measurement of the wind speed and direction over the sea surface by a frequency-modulated continous-wave radar demonstrator system operated in scatterometer mode have been developed. To evaluate the proposed algorithm, a simulation of the wind vector retrieval has been performed.
article 2005
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Kastelein, R.A. (author), van Schie, R. (author), Verboom, W.C. (author), de Haan, D. (author), TNO Defensie en Veiligheid (author)
The unmasked underwater hearing sensitivities of an 8-year-old male and a 7-year-old female Steller sea lion were measured in a pool, by using behavioral psychophysics. The animals were trained with positive reinforcement to respond when they detected an acoustic signal and not to respond when they did not. The signals were narrow-band,...
article 2005
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Kastelein, R.A. (author), Janssen, M. (author), Verboom, W.C. (author), de Haan, D. (author), TNO Defensie en Veiligheid (author)
Receiving beam patterns of a harbor porpoise were measured in the horizontal plane, using narrow-band frequency modulated signals with center frequencies of 16, 64, and 100 kHz. Total signal duration was 1000 ms, including a 200 ms rise time and 300 ms fall time. The harbor porpoise was trained to participate in a psychophysical test and...
article 2005
Searched for: subject%3A%22Frequency%255C%2Bmodulation%22
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