HTV-X System Integration Plan

摘要

Since International Space Station (ISS) operation has been extended up to 2024 and H-2 Transfer Vehicle (HTV) will finish cargo supply service around 2020, a new spacecraft HTV-X, an advanced version of HTV, is being developed. The first HTV-X is planned to be launched in JFY 2021. HTV-X has several major characteristics different from HTV. First, the system design concept is to simplify the module composition. As a result, the module number is reduced from four in HTV to two: Pressurized Module (PM) and Service Module (SM). Also, it has been studied to make the module interface simple by isolating functions of each module to a maximum extent. Second, the exposed and pressurized cargo service capability is improved in terms of cargo mass and reception schedule. Finally, HTV-X can offer an opportunity for on-orbit demonstration mission that can be extended up to 1.5 years at the maximum after departing from ISS. System integration plan is studied to be minimized based on HTV-X system design and HTV experience. This launch site operation duration will be improved to be half of that of HTV.