Realtime Magnetometer Calibration for Spinning Aerospace Vehicles

2022-2-8
Çetin, Mustafa Efe
Magnetometers are essential sensors for attitude estimation application in small spacecrafts due to their robust, inexpensive and lightweight characteristics. However, their direct usage is not applicable due to sensor errors. These errors limit the overall attitude estimation accuracy. This study proposes a complete real-time attitude independent magnetometer calibration algorithm for spinning aerospace vehicles. The recursive algorithm aims estimating the complete error state; consisting bias, scale factor and misalignment corrections, in real-time and without requiring any attitude information. To build the algorithm the well-known attitude-independent observation that is based on the magnitude of the sensed magnetic field is aided with new introduced quasi-measurements. The algorithm is tested with both simulations and real spacecraft data. Four quasi-measurements, which are derived using dynamic characteristics and orbital properties of the aerospace vehicle, considerably improve the convergence characteristics and estimation accuracy of the filter.

Suggestions

Dynamic stiffness-based test systems for viscoelastic material characterization: Design considerations
Özgen, Gökhan Osman; Batihan, Ali Cagri (2012-07-24)
In this paper, several important design issues for viscoelastic material characterization test systems which utilize dynamic stiffness measurements are discussed. These discussions are focused on structural dynamics aspects of the design of these test systems. These test systems are used to experimentally obtain the complex modulus of viscoelastic solids such as rubber, plastics, etc. Various standards exist on dynamic stiffness-based viscoelastic material characterization test methods, which give general g...
Approximate Bayesian Smoothing with Unknown Process and Measurement Noise Covariances
Ardeshiri, Tohid; Özkan, Emre; Orguner, Umut; Gustafsson, Fredrik (2015-12-01)
We present an adaptive smoother for linear state-space models with unknown process and measurement noise covariances. The proposed method utilizes the variational Bayes technique to perform approximate inference. The resulting smoother is computationally efficient, easy to implement, and can be applied to high dimensional linear systems. The performance of the algorithm is illustrated on a target tracking example.
EndNet: Sparse AutoEncoder Network for Endmember Extraction and Hyperspectral Unmixing
Ozkan, Savas; Kaya, Berk; Akar, Gözde (2019-01-01)
Data acquired from multichannel sensors are a highly valuable asset to interpret the environment for a variety of remote sensing applications. However, low spatial resolution is a critical limitation for previous sensors, and the constituent materials of a scene can be mixed in different fractions due to their spatial interactions. Spectral unmixing is a technique that allows us to obtain the material spectral signatures and their fractions from hyperspectral data. In this paper, we propose a novel endmembe...
Computational Design and Analysis of Efficient Couplers for Nano-optical Links
Altinoklu, A.; Ergül, Özgür Salih (2019-01-01)
We present rigorous optimization and design of efficient couplers to improve optical transmission along nanowires. It is well-known that nanowires are excellent tools to transmit electromagnetic power in nano-optical systems, while couplers become inevitable at critical locations, particularly in input/output regions and at corners if nanowires are bended. We use genetic algorithms supported by fast full-wave solutions to efficiently and accurately obtain effective couplers in alternative scenarios. The des...
Waveguide filters with ridged and unequal width resonators
Yıldırım, Nevzat; Hizal, A (2005-06-17)
Analytical expressions are developed for characterization of ridged / finned waveguides for use in the design of direct coupled waveguide filters with ridged and / or unequal width resonators. The analytical expressions are used to control the harmonic passbands and higher order modes. A survey is made for comparison of responses of waveguide filters using unequal width resonators and unequal ridge resonators. it is found that ridged resonators are more effective in suppressing the spurious passbands in the...
Citation Formats
M. E. Çetin, “Realtime Magnetometer Calibration for Spinning Aerospace Vehicles,” M.S. - Master of Science, Middle East Technical University, 2022.