Download
1 / 19
200 likes | 476 Views
LRO Operations Concept. Richard Saylor Jr. HTSI/Code 444 August 16-17, 2005. Operations Concept Development. Level 1, 2, and 3 requirements are used in the development the mission operations concept
E N D
LRO Operations Concept Richard Saylor Jr. HTSI/Code 444 August 16-17, 2005
Operations Concept Development • Level 1, 2, and 3 requirements are used in the development the mission operations concept • The operations concept describes the operational plan which will be used around the framework of the requirements • Document will be updated as the mission designs evolves • Initial version of the Lunar Reconnaissance Orbiter Concept of Operations is available • From the operations concept, lower level operational support documents will be developed
LRO’s View of the Universe • Twice a year, LRO will be in full Sun for roughly one month for each event. The full Sun condition occurs when the orbit Beta angle reaches ~76°. • During the eclipse season (the shaded portion of the Sun circle), LRO is expected to have a maximum lunar occultation of 48 minutes. The maximum duration lunar occultation will occur when the orbit beta angle reaches 0°. • Twice a year, LRO will be required to perform a 180° yaw maneuver. The yaw maneuvers will be performed as the orbit approaches the beta 0° condition. • Twice a month, LRO’s orbit will be in full view of the Earth for a period of ~2 days. During the 2 days, ground stations on the Earth will have continuous view of LRO. However, due to the HGA range of motion limitation, the HGA ground contacts will still be limited to approximately 56 minutes. The omni antennas can provide continuous coverage. • Twice a month, LRO will perform momentum management. The maneuver will occur when the ground has complete coverage of the orbit. • Once a month, LRO will perform station-keeping (SK) maneuvers to maintain the mission orbit. The station keeping maneuver will be performed when the ground stations has complete coverage of the orbit. • Twice a year (on average), the Earth will pass between the Moon and the Sun (Lunar Eclipse).
Data Flow Discussions • All commands will originate from the mission operations center • Instrument SOCs will delivery request and timelines as required • MOC will process and generate command loads or incorporate request into the daily pass activities • White Sands receives S/Ka downlinks • Ka-Band measurement data is transferred to MOC for processing. MOC distributes the data to each of the instrument SOCs. • MOC also will distribute mission planning products to ground system elements as required • Real-time housekeeping data is received at the MOC for monitoring orbiter health and safety
Mission Operations Team Staffing • Mission Operations Center will be located at GSFC • The mission operations team will support ground system and orbiter development prior to launch • Operations team will augment ground system test team, useful in providing training to the operations team • Operations team will provide test engineers for instruments, spacecraft box level, spacecraft bus, and orbiter level integration and test. • Help develop test procedures, command & telemetry databases, develop Users Guide and other related operations documentation • Provide ground system expertise • I&T will use the same Command and Telemetry system • Other systems will be shared such as the anomaly system • Staffing plan calls for gradual decrease in operations staffing level as the mission progress from commissioning to routine. • Rate of decrease will be dependent on mission activities and verification of automation
Summary • Initial operations concept has been developed for the mission • Lunar Reconnaissance Orbiter Mission Concept of Operations Document is available for review • Operations defined in document have been and continue to be included as part of the mission design • The operations document will continue to mature in preparation for mission PDR, but existing requirements are compatible with the concept.
