Fault Tolerant Attitude Estimation for Small Satellites

Small satellites use commercial off-the-shelf sensors and actuators for attitude determination and control (ADC) to reduce the cost. These sensors and actuators are usually not as robust as the available, more expensive, space-proven equipment. As a result, the ADC system of small satellites is more vulnerable to any fault compared to a system for larger competitors. This book aims to present useful solutions for fault tolerance in ADC systems of small satellites. The contents of the book can be divided into two categories: fault tolerant attitude filtering algorithms for small satellites and sensor calibration methods to compensate the sensor errors. MATLAB® will be used to demonstrate simulations. Presents fault tolerant attitude estimation algorithms for small satellites with an emphasis on algorithms’ practicability and applicability Incorporates fundamental knowledge about the attitude determination methods at large Discusses comprehensive information about attitude sensors for small satellites Reviews calibration algorithms for small satellite magnetometers with simulated examples Supports theory with MATLAB simulation results which can be easily understood by individuals without a comprehensive background in this field Covers up-to-date discussions for small satellite attitude systems design


Magnetometer Calibration for Advanced Small Satellite Missions
Söken, Halil Ersin (2015-07-10)
Implementation of magnetometers as attitude sensors onboard the small satellites brings with numerous challenges most of which caused by locating the sensors closely with other subsystems. One of these challenges is estimation and compensation of soft iron error that deteriorates the magnetometer measurements. This is a type of error formed by the ferromagnetic materials (or soft irons) onboard the satellite. Ferromagnetic materials are materials that can be magnetized by an external magnetic field and rema...
Vision-Based Detection and Distance Estimation of Micro Unmanned Aerial Vehicles
Gökçe, Fatih; Üçoluk, Göktürk; Şahin, Erol; Kalkan, Sinan (MDPI, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND, 2015-9)
Detection and distance estimation of micro unmanned aerial vehicles (mUAVs) is crucial for (i) the detection of intruder mUAVs in protected environments; (ii) sense and avoid purposes on mUAVs or on other aerial vehicles and (iii) multi-mUAV control scenarios, such as environmental monitoring, surveillance and exploration. In this article, we evaluate vision algorithms as alternatives for detection and distance estimation of mUAVs, since other sensing modalities entail certain limitations on the environment...
Dynamic modelling and control of a gimballed airborne antenna platform with mass unbalance and friction
Şeref, Tuğçe; Leblebicioğlu, Mehmet Kemal; Department of Electrical and Electronics Engineering (2018)
Inertial stabilized gimballed systems are widely-used in many applications to achieve a high precision positioning. Airborne antennas pointing target as a part of the satellite communication may be examples of such systems. This thesis presents the dynamic modelling and control of a two axes gimballed airborne antenna platform. First, reference frames and the transformation matrices are defined to build up the motion of the antenna and kinematic equations of each gimbal are derived. Next, the dynamic equati...
Imaging-based attitude determination algorithm for small satellites: Design and the preliminary results
Güzel, Mehmet Burak; Söken, Halil Ersin; Tekinalp, Ozan (2020-01-01)
Limitations for small satellite missions encourages researchers and engineers to use on-board equipment for multiple tasks. Thus, both space can be saved and the equipment redundancy can be prevented. For Earth-imaging satellites a prominent equipment that can be used for multiple purposes is the camera. Other than the observation, the taken images can be used as measurements for determining the absolute or relative attitude of the spacecraft. Depending on also the content of the image (e.g. stars, Earth, M...
Active vibration control of beam and plates by using piezoelectric patch actuators
Lüleci, İbrahim Furkan; Özgüven, Hasan Nevzat; Department of Mechanical Engineering (2013)
Conformal airborne antennas have several advantages compared to externally mounted antennas, and they will play an important role in future aircrafts. However, they are subjected to vibration induced deformations which degrade their electromagnetic performances. With the motivation of suppressing such vibrations, use of active vibration control techniques with piezoelectric actuators is investigated in this study. At first, it is aimed to control the first three bending modes of a cantilever beam. In this s...
Citation Formats
H. E. Söken, Fault Tolerant Attitude Estimation for Small Satellites. 2020.