985 resultados para SAR polarimetry


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Rozvoj českého školství. Napsal Jan Šafránek.--Filosofie.--Vědy právní a státni.--Dějepisectví.--Vědy exaktní.--Vědy přirodopisné.--Vědy lékařské.--Bibliografie. Dějiny literatury české.--Jazykozpyt. Literatury slovanské a cizí.--Filologie klassická.--Padesát let české literatury. 1848-1898. Napsal Jan Voborník.--Padesát let české hudby. 1848-1898.--Uměni výtvarná.

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Offprint: Revue des deux mondes (1er juillet 1912).

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Caption title.

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At head of title: Izdanīe tovarishchestva "Znanīe"

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Mode of access: Internet.

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Mode of access: Internet.

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Mode of access: Internet.

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Techniques for improving the signal to clutter ratio of an. ultra-wideband SAR designed to detect small mine-like objects in the surface of the ground were investigated. In particular, images were collected using different bistatic antenna configurations in an attempt to decorrelate the clutter with respect to the targets. The images were converted to a reference depression angle, summed, and then converted to ground coordinates. The resulting target strengths were then compared with the amplitude distribution of the ground clutter to show the improvement obtained. While some improvement was demonstrated, this was for the relatively easy scenario of targets on the surface partially obscured by grass. Detection based on thresholding the raw RF signal (the bipolar response) rather than the envelope (baseband I-2 + Q(2)) was also considered to further enhance target-to-clutter ratios.

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A nematocidal agent present in a southern Australian marine sponge of the genus Echinodictyum has been isolated and identified by detailed spectroscopic analysis and total synthesis as the novel betaine (-)-echinobetaine A (6). Preliminary SAR investigations have been undertaken.