부산대학교 도서관

The James Webb Space Telescope (JWST) Flight Dynamics Team (FDT), operating from the NASA Goddard Space Flight Center (GSFC) Flight Dynamics Facility (FDF), is responsible for providing orbit determination (OD), trajectory predictions, view period predictions, and maneuver planning, monitoring, reconstruction, and calibration. The FDT delivers products output from each type of support to the JWST Science and Operations Center (S&OC) located at the Space Telescope Science Institute (STScI). In addition to operations product generation, the FDT performs pre-launch analyses including launch window analyses (LWA) based on Arianespace-provided injection and separation states. These analyses are used to determine launch dates, times, and durations for the multiple mid-course correction (MCC) maneuvers that will enable JWST to reach its operational trajectory while meeting all orbit requirements. The FDT designed, developed, and tested the JWST Flight Dynamics Ground System (FDGS) to provide these capabilities to the JWST mission. This effort began with a requirements decomposition process based on parent requirements as well as a survey of documentation across the JWST Project. Several trade studies were performed to inform FDGS development, including decisions on the technologies to be used and where the FDGS would reside to determine the most efficient development path. Reducing development time was an important initial consideration given the initially constrained development timeline relative to the JWST launch. This paper details the FDT and the flight dynamics operations concept to support the commissioning and science operations phases. The FDT process of defining the flight dynamics operations concept leading to the design of the JWST FDGS architecture is explained, with attention placed on the design decisions and trade-offs that led to the final architecture. The existing FDF operational infrastructure made available to the JWST FDT, and the role it played in development efficiencies for the FDGS is presented. Additional details regarding the FDGS development process and the FDT usage of the FDGS to prepare for mission operations through the support of multiple rehearsals and simulations are discussed. Finally, lessons learned throughout this process include approaches taken by the FDT to produce an effective ground system within an efficient timeline.