NDLI: Quaternion error free estimation of reentry ballistic targets

Content Provider	IEEE Xplore Digital Library
Author	Dwivedi, P.N. Bhale, P.G. Bhattacharya, A. Padhi, R.
Copyright Year	2013
Description	Author affiliation: Dept. of Aerosp. Eng., Indian Inst. of Sci., Bangalore, India (Padhi, R.) \|\| DRDO, Hyderabad, India (Dwivedi, P.N.; Bhale, P.G.; Bhattacharya, A.)
Abstract	A common approach followed in state estimation of reentry ballistic targets is to formulate the problem where the process model is written in the Earth fixed inertial frame, where as the measurement model is written in the body frame of the interceptor. In such a formulation, to relate the states with the measurement vector, a transformation matrix is required to transform the position and velocity vectors from inertial frame to body frame and vice-versa. This matrix is constructed using the attitude quaternion information of the interceptor as obtained from its inertial navigation system. In a practical situation, however, when the time of flight is high, the navigation error build up is usually large, which introduces large errors in the transformation matrix. Due to this, the performance of the estimator is found to be not very good, even though the seeker gives good measurement data. To avoid this problem, a new estimation formulation is proposed in this paper, where the process model is written in the body frame of the interceptor. This formulation needs body rate information of the interceptor instead of the attitude quaternion, which does not degrade much with the time of flight. Hence, this new formulation is quite effective in estimating the target states accurately, thereby improving the mission performance substantially, even in presence of large navigation errors in the attitude quaternion. Extensive simulation results show the effectiveness of the proposed approach.
Starting Page	871
Ending Page	876
File Size	373235
Page Count	6
File Format	PDF
ISBN	9781479915590
ISSN	10851992
DOI	10.1109/CCA.2013.6662860
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-28
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Estimation Quaternions Mathematical model Acceleration Noise measurement Kalman filters Navigation
Content Type	Text
Resource Type	Article

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