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Sensors 2017, 17(10), 2285; https://doi.org/10.3390/s17102285

High-Accuracy Decoupling Estimation of the Systematic Coordinate Errors of an INS and Intensified High Dynamic Star Tracker Based on the Constrained Least Squares Method

Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China
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Received: 5 September 2017 / Revised: 1 October 2017 / Accepted: 3 October 2017 / Published: 7 October 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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Abstract

Navigation accuracy is one of the key performance indicators of an inertial navigation system (INS). Requirements for an accuracy assessment of an INS in a real work environment are exceedingly urgent because of enormous differences between real work and laboratory test environments. An attitude accuracy assessment of an INS based on the intensified high dynamic star tracker (IHDST) is particularly suitable for a real complex dynamic environment. However, the coupled systematic coordinate errors of an INS and the IHDST severely decrease the attitude assessment accuracy of an INS. Given that, a high-accuracy decoupling estimation method of the above systematic coordinate errors based on the constrained least squares (CLS) method is proposed in this paper. The reference frame of the IHDST is firstly converted to be consistent with that of the INS because their reference frames are completely different. Thereafter, the decoupling estimation model of the systematic coordinate errors is established and the CLS-based optimization method is utilized to estimate errors accurately. After compensating for error, the attitude accuracy of an INS can be assessed based on IHDST accurately. Both simulated experiments and real flight experiments of aircraft are conducted, and the experimental results demonstrate that the proposed method is effective and shows excellent performance for the attitude accuracy assessment of an INS in a real work environment. View Full-Text
Keywords: inertial navigation system; attitude accuracy assessment; intensified high dynamic star tracker; installation error; misalignment error; decoupling estimation model; constrained least squares inertial navigation system; attitude accuracy assessment; intensified high dynamic star tracker; installation error; misalignment error; decoupling estimation model; constrained least squares
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Jiang, J.; Yu, W.; Zhang, G. High-Accuracy Decoupling Estimation of the Systematic Coordinate Errors of an INS and Intensified High Dynamic Star Tracker Based on the Constrained Least Squares Method. Sensors 2017, 17, 2285.

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