Development of an Agility Model for Earth Observation Mission Planning Simulator, NSMS
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Mission Planning is one of the most important aspects of Phase 0/A studies of an Earth Observation Mission. It is essential to simulate all aspects of the mission to produce a mission plan that satisfies all the constraints. The work in this thesis involved development of the model of two such aspects of the mission-the geometrical visibility and the agility constraints. The model was developed for New SAR Mission Simulator, NSMS an earth observation mission simulator tool built indigenously at Airbus D&S, Friedrichshafen, Germany and written in Fortran. The objective was to expand the tool (NSMS) to incorporate agile satellites with optical instruments, and not just radar satellites. Thus, a more involved, 3-axis kinematic model for treatment of agility was needed. The model developed is based on Agile Satellites Scenario Evaluation Tool, ASSET: another indigenously built tool written in MATLAB with high fidelity agility modelling of agile satellites. The model was built to meet the high speed and efficiency requirements of NSMS while still ensuring a reasonably elaborate treatment of three-axis attitude kinematics of the satellite. This mandated high performance computing algorithms. To bring about the required changes, a new algorithm for patch acquisition was developed, a kinematic model used for scanning manoeuvres and a new simplified heritage algorithm was used for slew manoeuvres. The model was validated and tested with three test scenarios and was found to have fulfilled all objectives. Its agility was compared to ASSET and was found to be more rigid. The manoeuvring models were found to be more conservative than ASSET and the acquisition algorithm was found to be limiting the agility. It was, however, decided to keep the acquisition algorithm unchanged as this led to better imaging resolutions from the optical instruments that will be on-board.
Place, publisher, year, edition, pages
2015. , 78 p.
IdentifiersURN: urn:nbn:se:ltu:diva-50246Local ID: 78324cea-331d-4f1a-8011-34cb8e313ca0OAI: oai:DiVA.org:ltu-50246DiVA: diva2:1023603
Subject / course
Student thesis, at least 30 credits
Space Engineering, master's level
Validerat; 20151007 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved