研究了一種智能電子羅盤的誤差補償問題。把誤差的形成過程假設為從圓到橢圓的變化過程(橢圓假設) ,其逆過程就是誤差補償的過程。研究了基于橢圓假設求解誤差系數算法和誤差補償方法。該方法使智能電子羅盤容易地實現了自動誤差補償和自動校準,大幅度降低了成本。試驗結果表明:橢圓假設符合實際情況,補償效果顯著。按此方法對最大誤差高達±23. 7°的電子羅盤法進行自動補償后,最大剩余誤差降至±0. 4°。根據該方法研制的電子羅盤具有成本低、可靠性高和使用方便的特點。
關鍵詞: 電子羅盤; 智能傳感器; 誤差補償
Abstract : An error compensation method for intelligent electromagnetic compass ( IEMC) is studied. The forma2 tion of errors is supposed as a change process from a circle to an ellipse (ellipse hypothesis) ,and the reverse pro2 cess is just the compensation process. Algorithm for error coefficients and compensation method is studied based on the ellipse hypothesis. The method enables the IEMC to realize automatic error compensation and auto2calibra2
tion easily ,and lower the cost largely. Experiment shows that the hypothesis is correct and compensation result is satisfied. An IEMC ,whose maximum error was ±23. 7°,is automatic compensated ,and the residual erros is re2 duced to ±0. 4°. The characteristics of the IEMS based on the method are small size ,low cost and high reliabili2 ty.
Key words : electromagnetic compass ; intelligent sensor ; error compensation