基于皮萨伦科谱分解法的转台信号失真研究.pdfVIP

学兔兔 第31卷 第8期 仪 器 仪 表 学 报 Vo1．31 No．8 2010年8月 Chinese Jourua1 of Scientific Instrument Aug．2010 基于皮萨伦科谱分解法的转台信号失真研究 李绪友，张 娜 (哈尔滨工程大学自动化学院 哈尔滨 150001) 摘 要：i轴转白的精度是制约惯性器件测试结果精确性的瓶颈因素。根据转台在摇摆状态下输Hj信号的特点，提m采用皮 萨伦科谱分解法对其进行辨识。由此得到转台信号的幅度失真、频率失真以及夹杂在其中的分量谐波的幅度和频率。并通过 比较辨识前后转台误差的标准差，证明了辨识结果的可靠性。同时，分析了不同转台框在相同摇摆条件下的失真规律和同一转 台框在不同摇摆条件下的失真规律。实验结果表明，皮萨伦科谱分解法应用于转台止弦信号的失真辨识中是非常适用的，为惯 性器件测试中的测试设备误差补偿做好了前期准备。 关键词：三轴转台；皮萨伦科谱分解；正弦信号；失真 中图分类号：V249．12 文献标识码：A 国家标准学科分类代码：510．40 Study of turntable signal distortion based on Pisarenko spectrum decomposition Li Xuyou，Zhang Na (College ofAutomation，Harbin Engineering University，Harbin 150001，China) Abstract：The accuracy O±three—axis turntable is one 0 the key factors that constrain the precision of inertial device test results．Based on the characteristics of output signals under the sway states，the use of Pisarenko spectrum decom— position method is proposed for identifying the output signals of the turntable，which include the amplitude distortion， frequency distortion and the component harmonics．In this paper，the standard deviations of turntable errors are com— pared and analyzed to prove the credibility of the identification result．Moreover，the distortion laws are analyzed under two conditions：different turntable frames with the same sway conditions and identical turntable frame with different sway conditions．The results indicate that Pisarenko spectrum decomposition method is applicable to identify the sinu— soidal signal distortion of turntable，which makes an early preparation for the error compensation of inerti~test． Key words：three—axi