Angular Velocity Estimation for Nanosatellites Using Vector Measurements
In the absence of gyro sensors, the straightforward approach to estimate the angular velocity is using a dynamics-based attitude filter which can provide angular rate information together with the attitude of the satellite. However, this approach requires also the reference directions for the vec...
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| Format: | Article |
| Language: | English |
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Turkish Air Force Academy
2021-07-01
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| Series: | Havacılık ve Uzay Teknolojileri Dergisi |
| Subjects: | |
| Online Access: | http://jast.hho.edu.tr/index.php/JAST/article/view/478 |
| Summary: | In the absence of gyro sensors, the straightforward approach to estimate the
angular velocity is using a dynamics-based attitude filter which can provide
angular rate information together with the attitude of the satellite. However,
this approach requires also the reference directions for the vector
measurements. In this article, assuming that the reference directions are not
known, two different algorithms for angular velocity estimation, using only
the body vector measurements are given and compared. They both rely on
pre-filtering the noisy data, specifically for the magnetometer measurements.
The first algorithm estimates the Residual Magnetic Moment (RMM) terms
along with the angular velocity vector. The second algorithm does not use
the spacecraft dynamics and model the angular accelerations as a first-order
Markov process. Demonstrations show the first algorithm can provide an
accuracy up to o 0.035 /s for angular velocity estimates and accurately
estimate the RMM terms, whereas the second algorithm is a computationally
efficient alternate that can be used flexibly at any mission phase. |
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| ISSN: | 1304-0448 1304-0448 |