Research in trajectory optimization and development of jTOP to enable advanced space mission design.

过去的一年见证了太空探索的民主化，立方体卫星获得了前往月球的免费门票。13个任务被选为探索任务-1的后备任务，这是美国宇航局新火箭SLS的首次发射：其中两个任务由JAXA， OMOTENASHI和EQUULEUS领导。轨迹优化软件jTOP及其核心传播模块jPRO是这两个任务的关键组成部分。EQUULEUS将绕地月系统的拉格冈点运行。EQUULEUS的主要目标之一是测试微型卫星的轨道控制能力。jTOP是这项研究的主要组成部分，也是任务建议的基本工具，东京大学和ISAS的几名学生在任务设计中使用了jTOP。OMOTENASHI是一个具有挑战性的月球着陆器，其稳健的轨道设计与轨道确定和统计执行误差相结合。在这种情况下，数以百万计的轨迹由jPRO以高保真度开环计算，同时具有脉冲机动和连续推力。KAKENHI拨款成功地用于开发jTOP和jPRO，去年已有数十名硕士和博士生使用它们进行研究和两项任务的轨迹设计工作。虽然这种新方法尚未出现在经过评审的出版物中，但已经在国际会议上发表了一些论文，其中主要的结果是通过使用jTOP实现的。

The past year has witnessed a democratization of space exploration, with CubeSats being awarded a free ticket to the Moon . 13 missions were selected to fly as piggy back on Exploration Mission-1 , the maiden launch of NASA’s new rocket SLS: two of those missions are lead by JAXA, OMOTENASHI and EQUULEUS.The trajectory optimization software jTOP, and its core propagation module jPRO, developed in this KAKENHI grant, are key components of both missions. EQUULEUS will orbit the Largangian points of the Earth-Moon system. One of the main objectives of EQUULEUS is testing the orbit control capabilities of the microsat. jTOP is a main component for this investigation and was also a fundamental tool for the mission proposal, and has been used by several students in The University of Tokyo and ISAS for the mission design.OMOTENASHI is a challenging lunar lander, where the robust trajectory design is coupled with orbit determination and statistical execution errors. In this case, millions of trajectories are computed open loop by jPRO, in a high fidelity, with both impulsive maneuver and continuous thrust.KAKENHI grant was used successfully for the development jTOP and jPRO, which have been used by dozens of master and PhStudents in the last year for their research and for the trajectory design work for both missions. While the new approach has yet to appear in refereed publication, a number of papers have been presented at international conferences, where the main results are achieved by using jTOP.