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This paper presents a resampling method for underwater acoustic communication with non-uniform Doppler shifts. The current trend of Doppler compensation is two-step processing that consists of resampling and residual carrier frequency offset (CFO) compensation. In conventional approaches, a resampling ratio is assumed to be roughly constant and estimated on average in the measured Doppler shifts....
Fluorescence originating from chlorophyll provides information on the photosynthetic activities of vegetation. We have developed a ground-based remote sensing observation system that enables the stand-off measurements of fluorescence spectrum as well as two-dimensional distribution of fluorescence imagery. The initial laboratory test was conducted by means of the laser induced fluorescence (LIF) method...
The application of a hyperspectral camera to the analysis of aerosol optical property is described. As compared with conventional instruments such as a skyradiometer, imaging measurement is advantageous because of its capability of obtaining spatial distribution of scattered solar radiation with exact identification of the solar disk position in an image. In particular, it has been demonstrated that...
Atmospheric Data Collection Lidar (ADCL) of the Center for Environmental Remote Sensing (CEReS), Chiba University, is a multi-wavelength lidar system designed for measuring tropospheric aerosols and clouds with ancillary data from ground-based aerosol measurement instruments. In this paper, we report on the concept of aerosol and cloud retrieval based on vertical, slant-path, and plan-position indicator...
The technique of differential optical absorption spectroscopy (DOAS) is applied to monitor concentrations of nitrogen dioxide (NO2) and aerosol, the major pollutants in the urban atmosphere. Two DOAS paths with optical distances of a few kilometers have been set up in the Chiba city area. The spectra of visible radiation emitted from xenon flashlights installed on tall constructions are analyzed in...
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