[S-GD01] 測地学・GGOS

[SGD01-18] SLR 装置の小型化・低価格化： Omni-SLR 進捗報告

*大坪 俊通¹、荒木 博志²、横田 裕輔³、土井 浩一郎⁴、國森 裕生⁵、小林 美穂子¹、塚越 涼¹、友松 雅人¹、松本 岳大⁶ (1.一橋大学、2.国立天文台、3.東京大学、4.国立極地研究所、5.情報通信研究機構、6.宇宙航空研究開発機構)

キーワード：衛星レーザ測距、全球統合測地観測システム、宇宙測地技術

Satellite laser ranging (SLR) is a geodetic technique to measure the ground-to-satellite distance very precisely. It is regarded one of the core geodetic techniques to measure the geometrical and gravitational shape of the Earth. Currently about 40 stations have been operational over the world. Despite the fact that the number of satellites equipped with retroreflectors is boosting, the number of the ground tracking stations remains almost the same for a couple of decades. It is because today’s SLR systems are typically large and expensive, and therefore the compactness and low-cost are the key factors to strengthen the global SLR network.
We initiate a small project called Omni-SLR in 2020 to develop the first prototype system and demonstrate what can be achieved by a small low-cost SLR system.
We are currently designing the core part of Omni-SLR system. Key development elements include a nanosecond-pulse-width laser system, an optical design without Coude path, a lightweight telescope mount, an event timer, a coordinate monitoring system and operational software.