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Adaptive Measurement Model of Navigation by Stellar Refraction based on Multiple Models Switching

Published online by Cambridge University Press:  13 March 2014

Bo Yang ,
Fan Si ,
Fan Xu  and
Wenlan Zhou
Bo Yang
Affiliation:
(School of Astronautics, Beihang University, Beijing, China)
Fan Si*
Affiliation:
(School of Astronautics, Beihang University, Beijing, China)
Fan Xu
Affiliation:
(Beijing Aerospace Automatic Control Institute, Beijing, China)
Wenlan Zhou
Affiliation:
(School of Astronautics, Beihang University, Beijing, China)
*
(E-mail: [email protected])
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Abstract

In recent years, navigation by stellar refraction has received considerable attention, having advantages of high accuracy, simple construction, and low cost. Nevertheless, there are many limitations to the precision and application of this method using a traditional measurement model. This article studies the changing pattern of atmospheric density, the disturbed atmospheric density model and measurement model of stellar refraction ranging from 20 km to 50 km. Furthermore, a control algorithm of multiple mode switching and an adaptive measurement model are proposed. With this method, any refracted starlight from the scope of between 20 km and 50 km can be captured and the measurement model at the appropriate height can be automatically established. Due to this, the reliability and practicality of navigation have been raised considerably. Accuracy of navigation using the adaptive measurement method is observed to improve by about 14%, using computer simulation based on an Unscented Kalman Filter (UKF).

Keywords

Stellar refractionAtmospheric density modelAdaptive measurement modelMultiple models switching
Type
Research Article
Information
The Journal of Navigation , Volume 67 , Issue 4 , July 2014 , pp. 673 - 685
Copyright
Copyright © The Royal Institute of Navigation 2014 

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References

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