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Proceedings Paper

Estimation of orbital Doppler shift change due to nutation of attitude for 2-um coherent Doppler lidar on ISS-JEM (International Space Station-Japanese Experimental Module)
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Paper Abstract

Coherent Doppler Lidar (CDL), which has a capability of 3-D wind velocity measurements, can realize a global measurement of the wind profile in the troposphere from space. ISS(International Space Station) has been constructing from last year, and JEM(Japanese Experimental Module) attached to ISS is scheduled to be provided as a laboratory in space. We have been making a feasibility study for ISS-JEM/2-micrometer CDL. We expect that the ISS might give some technical problems because of a large scale and a man attended station. On the other hand, a measurement accuracy of 1m/s is required from the atmospheric science. We have to analyze the systematic error with considering the error factors to meet this requirement. There are two factors of the wind measurement errors caused by the nutation of ISS’s attitude. One of them is a change of receiving power, since it should change distances between CDL and a observing point. In this case, we have already shown that the wind error estimated was only ±0.05m/s (assumed width of pitching angle ; ±3deg). The other factor is a change of orbital Doppler shift. The accuracy of 1m/s is corresopnding to 1MHz. We calculated a frequency of orbital Doppler shift in case of non conical scanning one when ISS has the nutation of attitude with ±3deg,as a pitching angle and a rolling angle,respectively. The results obtained in this syudy are very useful to design a frequency agile CW laser as a local oscillator.In this paper, we describe more details for our analysis.

Paper Details

Date Published: 13 February 2001
PDF: 5 pages
Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417073
Show Author Affiliations
Makoto Totsuka, Tohoku Institute of Technology (Japan)
Kazuhiro Asai, Tohoku Institute of Technology (Japan)
Toshiki Iwasaki, Tohoku Univ. (Japan)
Kohei Mizutani, Communications Research Lab. (Japan)
Toshikasu Itabe, Communications Research Lab. (Japan)

Published in SPIE Proceedings Vol. 4153:
Lidar Remote Sensing for Industry and Environment Monitoring
Upendra N. Singh; Upendra N. Singh; Kazuhiro Asai; Toshikasu Itabe; Toshihiro Ogawa; Nobuo Sugimoto, Editor(s)

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