In February 2024, the Japan Aerospace Exploration Agency (JAXA) announced that its newly launched Quasi-Zenith Satellite System (QZSS) navigation satellite, QZS-3, had been lost due to a launch failure in January. The satellite was carried aboard the H3 launch vehicle—a next-generation rocket designed to be more cost-effective and reliable—on its second test flight. The mission aimed to expand Japan’s regional satellite-based augmentation system, which enhances GPS accuracy over Japan’s mountainous terrain and dense urban areas.According to JAXA, an anomaly occurred during the second-stage engine ignition, preventing the satellite from reaching the necessary velocity to enter its intended transfer orbit. Despite efforts to reestablish communication and regain control, the satellite was confirmed lost—either burned up during atmospheric reentry or crashed into the ocean. This failure deals a setback to Japan’s goal of completing a seven-satellite QZSS constellation capable of providing high-precision, independent positioning services around the clock.The H3 rocket, intended to replace the aging H-IIA series, is critical to Japan’s future space ambitions. However, this incident highlights ongoing technical challenges in its development. JAXA has pledged a thorough investigation and schedule adjustments for upcoming launches. Nevertheless, the Japanese government reaffirmed its commitment to building an autonomous navigation infrastructure, citing its strategic importance for both national security and civilian applications.
2024年2月，日本宇宙航空研究开发机构（JAXA）宣布，其于1月发射的新型准天顶导航卫星“指路3号”（QZS-3）因火箭故障未能进入预定轨道，最终确认已损失。此次发射使用的是H3运载火箭，这是该型号火箭第二次飞行任务，旨在部署日本自有的区域增强型卫星导航系统——准天顶卫星系统（QZSS），以提升GPS在日本复杂地形和城市峡谷中的定位精度。据JAXA通报，火箭在第二级发动机点火阶段出现异常，导致卫星无法获得足够速度进入转移轨道。尽管团队尝试恢复通信与控制，但最终确认卫星已再入大气层烧毁或坠入海洋，任务失败。这一挫折对日本推进自主高精度定位能力构成打击，原计划通过7颗卫星组成的QZSS系统实现全天候、高可用性服务的目标或将推迟。值得注意的是，H3火箭作为日本新一代主力运载工具，肩负着降低成本、提高可靠性的使命。此次失败暴露了其技术成熟度仍需验证。JAXA表示将全面调查原因，并调整后续发射计划。尽管遭遇挫折，日本政府仍强调发展独立导航系统对国家安全与民用技术的重要性，未来将继续推进QZSS建设。
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