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)

Makoto Totsuka; Kazuhiro Asai; Toshiki Iwasaki; Kohei Mizutani; Toshikasu Itabe

doi:10.1117/12.417073

13 February 2001 Estimation of orbital Doppler shift change due to nutation of attitude for 2-μm coherent Doppler lidar on ISS-JEM (International Space Station-Japanese Experimental Module)

Makoto Totsuka, Kazuhiro Asai, Toshiki Iwasaki, Kohei Mizutani, Toshikasu Itabe

Author Affiliations +

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417073
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

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.

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Makoto Totsuka, Kazuhiro Asai, Toshiki Iwasaki, Kohei Mizutani, and Toshikasu Itabe "Estimation of orbital Doppler shift change due to nutation of attitude for 2-μm coherent Doppler lidar on ISS-JEM (International Space Station-Japanese Experimental Module)", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417073

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KEYWORDS

Doppler effect

LIDAR

Wind measurement

Error analysis

3D metrology

Atmospheric sciences

Continuous wave operation

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