Title:Covariance Matching Based Adaptive Attitude Estimation of a Nano-
Satellite Using SVD-Aided EKF
Volume: 3
Issue: 2
Author(s): Chingiz Hajiyev*Demet Cilden-Guler
Affiliation:
- Faculty of Aeronautics and Astronautics, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey
Keywords:
Covariance matching, SVD-aided EKF, attitude estimation, nanosatellite, adaptive filter, Single frame methods.
Abstract:
Background: The covariance matching procedure of the measurement noise covariance,
namely the R matrix, was processed in singular value decomposition (SVD), which is one of the
single-frame methods.
Aims: Tuning the system noise covariance Q matrix for the single-frame method aided Kalman filtering
algorithm.
Objective: Develop the R and Q double covariance matching rule for the single-frame method aided
Kalman filtering algorithm.
Methods: The matching procedure of the measurement noise covariance, namely the R matrix, is
processed in singular value decomposition (SVD), which is one of the single-frame methods. The
second matching rule is defined in the second stage of the proposed EKF design.
Results: The matching rules are run simultaneously, which makes the filter capable of being robust
against initialization errors, system noise uncertainties, and measurement malfunctions at the same
time without an external filter design necessity.
Conclusion: A single-frame method aided Kalman filtering algorithm based double covariance
matching rule is presented in this paper. First, the measurement noise covariance matching is introduced
using the SVD method that processes the R-adaptation inherently for the filtering stage. Second,
the system noise covariance matching is described so as to have double covariance matching
at the same time during the estimation procedure. The SVD-Aided AEKF becomes R- and Qadaptive
simultaneously by applying the Q-adaptation rule to the intrinsically R-adaptive SVDaided
EKF.