Journal of The Remote Sensing Society of Japan

Optimal Frequency for Microwave Radiometric Observation of Sea Surface Wind from Satellite

Yasunoni Sasaki, Ichio Asanuma, Kei Muneyama, Gen'ichi Naito, Tsutomu ...

1987 Volume 7 Issue 2 Pages 99-112
Published: June 30, 1987
Released on J-STAGE: May 22, 2009

DOIhttps://doi.org/10.11440/rssj1981.7.99

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This study is concerned with optinal frequency estimation for microwave radiometric observation of sea surface wind from satellite. Estimation is made in terms of effects of some typical atmospheric substances on
(1) apparent wind speed sensitivity of the sea surface brightness temperature of both polarizations at satellite level at incidence angles 0, 10, 20, 30 and 40 degrees and
(2) sky brightness temperature at normal incidence, in frequency range from 1 to 40 GHz, incorporating their typical atmospheric models. Oxygen, water vapor, cloud water and rain are the typical atmospheric substances. Among them, rainfall has the greatest effect, and water vapor, cloud mater and oxygen follow. Microwave radiometry will be effective for sea surface wind observation even in the rainfall, however, at most up to the rainfall rate of 1-2 mm/hr, and the frequency range from 10-18 GHz will be the optimal one, 25-30, 30-40 and 5-10 GHz bands following. This order, of course, depends on the atmospheric conditions in the strict sense.

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Proposal of the Earth-Satellite Hadamard Transform Laser Absorption Spectrometer System for Monitoring Trace Species in the Global Atmophere

Nobuo Sugimoto

1987 Volume 7 Issue 2 Pages 113-121
Published: June 30, 1987
Released on J-STAGE: May 22, 2009

DOIhttps://doi.org/10.11440/rssj1981.7.113

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A new laser long-path absorption spectrometer system between the earth and a satellite for monitoring trace species in the global atmosphere is proposed. The spectrometer satellite launched into the stationary orbit detects the multiple laser beams from the ground based laser stations simultaneously. The laser beams from ground stations are modulated by an Hadamard code. By this method each ground station can make long-path measurement independently. The minimum detectable optical density of 10^-5 is achieved for each measurement. Most of the important trace species can be measured with sufficient accuracy if suitable laser sources are used.

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Development and Research on Radio Acoustic Sounding System (RASS)

Madoka Fukushima

1987 Volume 7 Issue 2 Pages 123-134
Published: June 30, 1987
Released on J-STAGE: May 22, 2009

DOIhttps://doi.org/10.11440/rssj1981.7.123

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Development and research on Radio Acoustic Sounding System (RASS) are reviewed. RASS technique is used to remotely measure the atmosphereic temperature profiles. Principles of two methods of temperature mesurements, i.e., Doppler determination and Bragg resonance determination of temperature are outlined. Merit and demerit of both methods are discussed. The state of the art of development of RASS theories based on radio wave scattering by radio refractive-index inhomogeneities produced by an acoustic wave is reviewed in brief.

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[title in Japanese]

1987 Volume 7 Issue 2 Pages 135-136
Published: June 30, 1987
Released on J-STAGE: May 22, 2009

DOIhttps://doi.org/10.11440/rssj1981.7.135

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[title in Japanese]

1987 Volume 7 Issue 2 Pages 138-148
Published: June 30, 1987
Released on J-STAGE: May 22, 2009

DOIhttps://doi.org/10.11440/rssj1981.7.138

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