Angular Velocity Estimation for Nanosatellites Using Vector Measurements

Soken, Halil Ersin

Angular Velocity Estimation for Nanosatellites Using Vector Measurements

Halil Ersin SÖKEN (Orta Doğu Teknik Üniversitesi, Havacılık ve Uzay Mühendisliği Bölümü, Ankara, Türkiye)

Havacılık ve Uzay Teknolojileri Dergisi

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Yıl: 2021 Cilt: 14 Sayı: 2 Sayfa Aralığı: 221 - 229 Metin Dili: İngilizce İndeks Tarihi: 25-01-2022

Angular Velocity Estimation for Nanosatellites Using Vector Measurements

Öz:

n 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 too 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.

Anahtar Kelime:

Nano Uydular için Vektör Ölçümleri Kullanılarak Açısal Hız Kestirimi

Öz:

Dönüölçerlerin yokluğunda açısal hız kestirimi için kullanılabilecek en bilinen yöntemlerden biri dinamik tabanlı bir filtre ile hem açısal hızların hem de uydunun yöneliminin kestirimidir. Fakat bu yaklaşım vektör ölçümleri için referans yönelimleri de gerektirir. Bu makalede referans vektör yönlerinin bilinmediği varsayılarak, sadece gövde eksen takımında ölçülmüş vektörleri kullanan iki farklı açısal hız kestirim yöntemi sunulmuş ve karşılaştırılmıştır. Her iki yöntem de özellikle manyetometreler için gürültülü verilerin öncül bir filtreden geçirilmesine dayanmaktadır. İlk algoritma açısal hızların yanısıra Artık Manyetik Moment (AMM) terimlerini de kestirmektedir. İkinci algoritma uydu dinamiklerini kullanmamakta, açısal ivmeyi birinci mertebeden bir Markov süreci şeklinde modellemektedir. Benzetimler göstermektedir ki ilk algoritmao 0.035 /s mertebesinde bir açısal hız kestirim doğruluğuna erişebilmekte ve AMM terimlerini doğru olarak kestirebilmekte iken, ikinci algoritma farklı görev safhalarında da kullanılabilecek hesaplama açısından etkin bir alternatif sunmaktadır.

Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	Soken H (2021). Angular Velocity Estimation for Nanosatellites Using Vector Measurements. , 221 - 229.
Chicago	Soken Halil Ersin Angular Velocity Estimation for Nanosatellites Using Vector Measurements. (2021): 221 - 229.
MLA	Soken Halil Ersin Angular Velocity Estimation for Nanosatellites Using Vector Measurements. , 2021, ss.221 - 229.
AMA	Soken H Angular Velocity Estimation for Nanosatellites Using Vector Measurements. . 2021; 221 - 229.
Vancouver	Soken H Angular Velocity Estimation for Nanosatellites Using Vector Measurements. . 2021; 221 - 229.
IEEE	Soken H "Angular Velocity Estimation for Nanosatellites Using Vector Measurements." , ss.221 - 229, 2021.
ISNAD	Soken, Halil Ersin. "Angular Velocity Estimation for Nanosatellites Using Vector Measurements". (2021), 221-229.

APA	Soken H (2021). Angular Velocity Estimation for Nanosatellites Using Vector Measurements. Havacılık ve Uzay Teknolojileri Dergisi, 14(2), 221 - 229.
Chicago	Soken Halil Ersin Angular Velocity Estimation for Nanosatellites Using Vector Measurements. Havacılık ve Uzay Teknolojileri Dergisi 14, no.2 (2021): 221 - 229.
MLA	Soken Halil Ersin Angular Velocity Estimation for Nanosatellites Using Vector Measurements. Havacılık ve Uzay Teknolojileri Dergisi, vol.14, no.2, 2021, ss.221 - 229.
AMA	Soken H Angular Velocity Estimation for Nanosatellites Using Vector Measurements. Havacılık ve Uzay Teknolojileri Dergisi. 2021; 14(2): 221 - 229.
Vancouver	Soken H Angular Velocity Estimation for Nanosatellites Using Vector Measurements. Havacılık ve Uzay Teknolojileri Dergisi. 2021; 14(2): 221 - 229.
IEEE	Soken H "Angular Velocity Estimation for Nanosatellites Using Vector Measurements." Havacılık ve Uzay Teknolojileri Dergisi, 14, ss.221 - 229, 2021.
ISNAD	Soken, Halil Ersin. "Angular Velocity Estimation for Nanosatellites Using Vector Measurements". Havacılık ve Uzay Teknolojileri Dergisi 14/2 (2021), 221-229.