Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT46] New phase of GPS/GNSS application as an integrated earth observation system

Mon. May 27, 2019 3:30 PM - 5:00 PM 106 (1F)

convener:Yoshinori Shoji(The Second Laboratory of Meteorological Satellite and Observation System Research Department, Meteorological Research Institute), Kaoru Ichikawa(Research Institute for Applied Mechanics, Kyushu University), Yusaku Ohta(Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University), Takuya Tsugawa(National Institute of Information and Communications Technology), Chairperson:Yoshinori Shoji(Meteorological Research Institute)

4:15 PM - 4:30 PM

[MTT46-15] Comparison of a water vapor observation with GPS and high sensitivity microwave radiometer, KUMODeS

*Taketo Nagasaki1, Osamu Tajima2, Ryuichi Ichikawa3, Hiroshi Takiguchi4, Kentaro Araki5, Hiroshi Ishimoto5 (1.High Energy Accelerator Research Organization, IPNS, 2.Kyoto University, 3.National Institute of Information and Communications Technology, 4.Japan Aerospace Exploration Agency, 5.Meteorological Research Institute)

Keywords:water vapor, microwave radiometer

GPS is one of the useful technique which is using electromagnetic waves in the atmosphere. However, radio waves through the atmosphere and have a delay due to water vapor then. It is a major factor of indeterminacy in some measurement. On the other hand, as a device for identifying the amount of water vapor is a microwave radiometer.
We have developed a new microwave radiometer "KUMODeS" to detect local and sudden natural disasters such as tornadoes. This system observes radiation from water molecules present in the atmosphere (20-30 GHz band) and the emission line from the oxygen molecule (50-60 GHz band) are measured at the same time. As a result, the amount of water vapor in the atmosphere is estimated with high accuracy. As a characteristic of KUMODeS, high sensitivity (low noise) was employed as a cooling receiver by application of radio astronomical observation technology. In order to improve convenience, we employed a low-temperature(45K) calibration source in the cryostat and can be operated by remote control. And we are able to select a higher spatial resolution. We conducted long-term observations for more than half a year in Tsukuba city using KUMODeS. At the same point, we measured the amount of water vapor by GPS antenna and confirmed the validity of the observation result. In addition, we have also developed the second device that aimed at a smaller size and lower power consumption as a development of KUMODeS. In this presentation, we report the outline of the system and the results of atmospheric observation in Tsukuba City.
This research has been funded by “Program for Creating STart-ups from Advance Research and Technology (START Program)” from the Ministry of Education, Culture, Sports, Science and Technology, Japan, http://www.jst.go.jp/start/en/index.html.