Development of attitude determination sensors for miniature satellites
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Attitude determination is an important subsystem of any satellite application. Several different approaches are available to determine the orientation of a spacecraft. By using a sun sensor, a pointing vector in the direction of the sun can be obtained. Combined with the known position in orbit, and sun position in relation to the satellite, the attitude of the satellite can be determined. Several types of sun sensors are available such as coarse cosine sensors, which measures the current which is proportional to the angle of incident. Other models can be implemented to increase the accuracy such as pinhole model which constricts the sun light to a narrow beam which is measured by a PSD (Position Sensitive Device). By carefully designing the parameters of the sensor, features such as 100° field of view and accuracy better than 1° can be achieved. To increase the accuracy, calibration can be done using various mathematical models to reduce errors that would otherwise be consistent throughout measurements. By reducing noise the accuracy can be improved further. This is done by modelling the frequency response of the interface between the attitude determination system and the sensor, and then making design changes accordingly which would be used to diminish the noise experienced by the attitude determination system. To limit the thermal noise experienced by the sensor, thermal design is important to keep the PSD at a suitable operational temperature.
Place, publisher, year, edition, pages
2014. , 77 p.
Teknik, Sun sensor, attitude determination, pico satellite, attitude control, PSD sensor
IdentifiersURN: urn:nbn:se:ltu:diva-52057Local ID: 934f2cc9-695e-4879-b25d-969e64dbd500OAI: oai:DiVA.org:ltu-52057DiVA: diva2:1025423
Subject / course
Student thesis, at least 30 credits
Space Engineering, master's level
Kay Soon, Low
Validerat; 20140820 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved