Mitsubishi Heavy Industries (MHI) has completed an in-orbit demonstration of its AI-based object detection system AIRIS, which identified ships from satellite imagery using a next-generation space-grade microprocessor unit.
The AIRIS system, short for Artificial Intelligence Retraining In Space, combines an AI-equipped data processor with an earth observation camera developed by the Tokyo University of Science.
MHI said the system operates onboard a satellite using the SOISOC4 space-grade MPU, which was jointly developed with the Japan Aerospace Exploration Agency (JAXA).
AIRIS was launched aboard JAXA’s RAISE-4 small demonstration satellite in December 2025 under the agency’s Innovative Satellite Technology Demonstration Program.
The company said the in-orbit demonstration successfully detected ships from maritime imagery captured during operations in space.
MHI noted the future work will focus on establishing a continuous improvement cycle by retraining AI models on the ground using operational imagery and remotely updating the AI onboard the satellite.
The demonstration program also includes in-orbit testing of the SOISOC4 MPU itself.
According to MHI, the project forms part of broader efforts to advance space equipment technologies and support Japan’s space development capabilities.
