LEO-PNT satellite constellation (conceptual image)
Tokyo, Japan, May 19, 2026 – ArkEdge Space Inc. (“ArkEdge Space”), a Tokyo-based space start-up delivering end-to-end micro-satellite constellation solutions from design to operations, announced that it has completed a study commissioned by JAXA on “Elemental Technologies and Systems for a Dedicated, GNSS-Independent LEO-PNT Satellite System.”
Positioning, Navigation and Timing (PNT), currently derived from Global Navigation Satellite Systems (GNSS) such as the US Global Positioning System (GPS), is vital to everyday life, from financial transactions to telecommunications and infrastructure. But this critical infrastructure is increasingly subject to interruption and interference, both through environmental and security challenges. Finding methods to protect PNT information against such interference is of paramount importance for governments and commercial actors alike.
This project addressed such challenges by examining and categorizing the necessary elemental technologies, including signal design, receiver technology, ground infrastructure, satellite sensors, and the overall system architecture required to realize a LEO-PNT system capable of providing PNT without reliance on traditional GNSS.
Conceptual LEO-PNT constellation scenarios and HDOP coverage examined in the study.
The study’s focus included achieving satellite orbit determination and time synchronization (ODTS) without GNSS, one of the key challenges facing alternative PNT providers. To address this, the study explored a new architecture for onboard time determination that avoids the need for large atomic clocks. Instead of onboard clocks, the system transmits precise timing information from combinations of ground-based reference clocks, pseudolites, and inter-satellite optical links to disseminate information and enable on-orbit ODTS.
In addition, the study considered diverse frequencies to strengthen anti-jamming measures. It also looked at novel signal design, receivers, encryption and signal authentication methods, and their suitability for LEO-PNT satellites. The results of this study will now contribute to the next stage of development for a GNSS-independent LEO-PNT concept.
ArkEdge Space Chief Strategy Officer Tomoaki Yasuda said: “This study is critical to advancing our understanding of Japan’s future relationship with Position, Navigation and Timing. Across the world, users are facing denial of GNSS services, and that can have critical consequences for sectors including the economy, transport and emergency services, among others. We look forward to progressing the GNSS-independent LEO-PNT concept with the support of our partners.”
Dr Masaya Murata at the Japan Aerospace Exploration Agency said: “Due to the prevalence of GNSS interference, alternative PNT systems are becoming increasingly important to protect users and assets such as critical national infrastructure. Following the successful conclusion of this GNSS-independent LEO-PNT study with ArkEdge Space, our investigation into a robust and resilient LEO-PNT system continues. We are also emphasizing international cooperation with other LEO-PNT providers to maximize users’ PNT experience and continue to engage in collaborative discussions.”
About ArkEdge Space
ArkEdge Space is a Japanese space technology company offering end-to-end solutions for micro-satellite constellations—from planning and design to mass production and operations. Guided by its mission of “empowering people with satellites for a prosperous future,” the company is advancing capabilities in Earth observation, maritime satellite communications (VDES), optical communications, and low-Earth orbit satellite positioning, as well as lunar activities and deep space exploration. Through our mission, ArkEdge Space continues to drive the advancement of space innovation and its practical application.
Head Office Location
3F, Dome Ariake Headquarter, 1-3-33 Ariake, Koto-ku, Tokyo, Japan
CEO: Takayoshi FUKUYO
Founded: in July 2018
Website: https://arkedgespace.com/