Our paper on the compact, low‑cost, and multi‑purpose Omni‑SLR system that we have devoted ourselves to over the past five years has been published on Journal of Geodesy. 
https://doi.org/10.1007/s00190-026-02066-5

The newly publised paper focuses on improving the detection accuracy of Satellite Laser Ranging (SLR) signals in environments with low signal-to-noise ratios. This study improves upon the conventional method by adopting a hexagonal binning technique instead of the standard rectangular bins.

Julian Rodriguez-Villamizar, Matthew Wilkinson, Nicolas Maurice, José Carlos Rodríguez, Toshimichi Otsubo, Advances in Space Research, Available online 17 July 2025

https://doi.org/10.1016/j.asr.2025.07.035

T Otsubo was chosen as one of the Excellent Reviewers 2024 of Earth, Planets and Space.

https://earth-planets-space.springeropen.com/excellent-reviewers

全球統合測地観測システム（GGOS）から，新たに「地球基準座標系」の短い解説動画が出ました．国土地理院さんによる日本語サブタイトル付き．

そのほかのコンテンツもあわせてごらんください．

GGOS YouTube チャンネル：https://www.youtube.com/@iag-ggos

GGOS ウェブサイト：https://ggos.org/

GGOS Japan ウェブサイト：https://ggos.org/about/org/affiliates/ggos-japan/

2024年3月11日に開催された GGOS Japan 年次会合にて，大坪は8年間務めた GGOS Japan 座長から退き，後任の座長は幹事であった宮原さん（国土地理院），幹事は横田さん（東京大学）にお願いすることになりました．
https://ggos.org/about/org/affiliates/ggos-japan/members/

時をほぼ同じくして，日本測量協会の月刊「測量」に，GGOS Japan に関するテクニカルレポートを執筆しまして，2024年3月号に掲載されています．

https://www.jsurvey.jp/1-4-2024.htm

On 22 and 26 December 2023, on the rooftop of National Institute of Polar Research, Tachikawa, we have successfully received echoes from 4 low-orbit passes using the Omni-SLR system, which is a new style of Satellite Laser Ranging (SLR) – very compact and drastically low-cost.  It is jointly developed by Hitotsubashi University, National Astronomical Observatory of Japan and University of Tokyo.

• Saral (O-C plots below) and Swarm-C on 22 December
• Beacon-C  and Swarm-C on 26 December

We are thankful for those who have supported us, and we plan to continue the development.

A paper on acoustically detecting the direction of closely-flying aircraft is now published in Advances in Space Research.   

Toshimichi Otsubo, Mihoko Kobayashi, Yusuke Yokota, Kenji Kouno, Hiroshi Araki,
Acoustic positioning of closely-flying aircraft for eye safety of space laser applications,
Advances in Space Research,
2023,
https://doi.org/10.1016/j.asr.2023.09.067

10月12日，日本測地学会講演会において，大坪が座長を務める GGOS Japan が日本測地学会坪井賞（団体賞）を受賞しました．幹事の宮原さんとともに記念講演をしてまいりました．

GGOS Japan 記事：https://ggos.org/about/org/affiliates/ggos-japan/

GGOS 記事 (thanks to M Sehnal)：https://ggos.org/news/ggos-japan-tsuboi-prize/