A Study on Survey of Tidal Flats by GNSS-R using High Elevation QZSS

Hiroki Irie,Yuki Yoshino, Kiyoteru Hayama, Yuji Kamikubo, Osamu Okamoto, Kazuyoshi Takahashi

Abstract:	GNSS reflectometry involves making measurements from the reflections from the Earth of navigation signals from Global Navigation Satellite Systems such as GPS and QZSS. Mudflats or mud flats, also known as tidal flats, are coastal wetlands that form when mud is deposited by tides. Tidal flats may be viewed geologically as exposed layers of bay mud, resulting from deposition of estuarine silts, clays and marine animal detritus. Most of the sediment within a mudflat is within the intertidal zone, and thus the flat is submerged and exposed approximately twice daily. Tidal flats are important ecosystems. In modern Japan, we have landfilled tidal flat to create a flat ground and used it as a factory area and housing. To protect the ocean ecosystem, it is necessary to investigate the topography change of the tidal flats. We studied to explore the topography of tideland as utilization of GNSS-R. The QZSS satellite stays at a high elevation angle for a relatively long time compared to the GPS satellite. Radio waves of satellites with a low elevation angle strongly reflect, but the delay time of reflected waves is short. A satellite with a high elevation angle has a small reflected wave, but its delay is large, so it is easy to separate the reflected wave. In this research, we report the result of examining GNSS-R using QZSS.
Published in:	Proceedings of the ION 2017 Pacific PNT Meeting May 1 - 4, 2017 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	960 - 964
Cite this article:	Irie, Hiroki, Yoshino, Yuki, Hayama, Kiyoteru, Kamikubo, Yuji, Okamoto, Osamu, Takahashi, Kazuyoshi, "A Study on Survey of Tidal Flats by GNSS-R using High Elevation QZSS," Proceedings of the ION 2017 Pacific PNT Meeting, Honolulu, Hawaii, May 2017, pp. 960-964. https://doi.org/10.33012/2017.15032
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