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固裝式慣性系統考慮輸入估測效應於初始調平方法之研究

The Use of Input Estimation Algorithm to Initial Leveling of Strapdown Inertial System

摘要


慣性系統使用兩種基本慣性感測元件(加速儀和陀螺儀)固裝於航具上來執行導航之功能。導航之精度與其初始校準之精確與否具有密不可分之關係,傳統的「羅經校準法」需要充分時間來過濾航具運動時之擾動現象,是以用於快速之校準常慣性系統之精度。本文討論應用卡曼濾波器方法,可於-短時間內完成對慣性系統之調平誤差估測。載具運動係由二階馬可夫過程所產生,系統狀態變數可由感測器之輸出經估測器測得。而爲了能考慮真實狀態中的長時間大擾動現象,加入輸入估測理論,能獲得一理想的估測狀態,其結果將提供運動載具(舶、車輛、飛行器)一快速精確的初始調校方法。

並列摘要


This paper propose that with the application of the Kalman filtering technique, the leveling process of inertial navigation system with base motion can be carried out in a much short time. The base motion is generated by a second order Markov process. Furhter, for a long time huge disturbance during the vehicle motion, using the input estimation technique to modify the Kalman gain computation can obtain a good leveling error estimated. The results can be integrated into a true motion to provide a fast accuracy method for initial leveling.

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