Satellite Data Strategy Bridging National Security and Commercial Space: Rethinking Next-Generation Space Infrastructure in the Japan Aerospace Self-Defense Force Era

July 2026 Expert Yuki Taji
Competitiveness in space infrastructure is no longer decided by how many satellites one owns. In the first half of 2026, a rapid succession of developments—the Ministry of Defense's contract for its "Tri-Sat" satellite program, the reorganization into the Japan Aerospace Self-Defense Force, and the selection of J-LEO to carry communications autonomy—moved Japan's space infrastructure from the stage of "concept" to that of "implementation." The real question is who links the information gained from space to decisions, when, and in what order of priority. Drawing on the author's own experience operating satellite communications within the Japan Self-Defense Forces, this article examines the design of a next-generation space infrastructure that keeps national security and commercial space in mutual circulation.
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In the first half of 2026, three milestones were etched into Japan's space infrastructure.

　In the first half of 2026, a series of events unfolded in quick succession that reshaped the security and industrial landscape of Japan's space sector. First, on February 19, the Ministry of Defense concluded a contract for the "Satellite Constellation Development and Operation Project" with the special purpose company Tri-Sat Constellation (hereafter "Tri-Sat"). Valued at 283.1 billion yen, it ranks among the largest Private Finance Initiative (PFI) projects in Japan's space-related budget. Second, on June 26, the amended Act for Establishment of the Ministry of Defense and related legislation was enacted to reorganize the Japan Air Self-Defense Force into the "Japan Aerospace Self-Defense Force," confirming the first change to the Japan Self-Defense Forces' naming since their founding in 1954. Third, …

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