为减小舰船直航时风、流、摇摆等干扰对电罗经航向的影响，提高电罗经指向精度，采用小波变换对电罗经直航向数据进行消噪处理，获得较为平稳的信号；对消噪后的信号经能量频点分析并傅里叶展开；基于改进的四参数估计法，对直航向信号建立自适应迭代预测模型，并与实测数据进行验证对比。结果表明，采用小波分析、傅里叶级数同四参数估计相结合的自适应建模方法适用于电罗经直航向建模，航向预测效果优于传统四参数估计法。
In order to reduce the linear course error and enhance the heading accuracy of Electromagnetic Controlled Gyrocompass, based on wavelet to denoising, obtain a much more smooth signal, based the signal, make use of Fourier transform to do the time/frequency switch, analysis the signal with frequence spots' energy, modeling with the Fourier Expansion model based on the improved 4 parameters estimation of sine-wave, modeling a self-adaptive model to predict the course of electromagnetic controlled gyrocompass in a high accuracy. The prediction and the data indicates that combine the self-adaptive 4 parameters estimation with wavelet and fourier expansion model of the course data could have a good description, it is better than formal 4 parameters estimation.
2016,38(10): 125-128,132 收稿日期：2015-12-14
DOI：10.3404/j.issn.1672-7619.2016.10.025
分类号：U666.1
作者简介：夏卫星(1985-),男,博士,讲师,研究方向为航海导航。
参考文献：
[1] 谢荣生, 孙枫, 郝燕玲, 等. 基于小波分析的船用捷联陀螺信号滤波方法[J]. 哈尔滨工程大学学报, 2001, 22(2):24-26. XIE Rong-sheng, SUN Feng, HAO Yan-ling, et al. Filtering of ship'sstrap-down gyroscope signals based on wavelet analysis[J], Journal of Harbin Engineering University, 2001, 22(2):24-26.
[2] 刘前林, 王立世, 黄新建. 运用傅里叶变换对差分吸收光谱的解析[J]. 光谱学与光谱分析, 2008, 28(5):1076-1079. LIU Qian-lin, WANG Li-shi, HUANG Xin-jian. Using fourier transform to analyse differential optical absorption spectrum[J], Spectroscopy and Spectral Analysis, 2008, 28(5):1076-1079.
[3] 梁志国, 张大治, 孙璟宇, 等. 四参数正弦波曲线拟合的快速算法[J]. 计测技术, 2006, 26(1):4-7, 47. LIANG Zhi-guo, ZHANG Da-zhi, SUN Jing-yu, et al. A fast arithmetic method of four-parameter sine wave curve-fit[J], Theory and Practice, 2006,26(1):4-7.
[4] 万彦辉, 秦永元. 小波分析在陀螺信号滤波中的研究[J]. 压电与声光, 2005, 27(4):455-457. WAN Yan-hui, QING Yong-yuan. Application of wavelet analysis in gyro signal filtering[J], Piezoelectrics and Acoustooptics, 2005, 27(4):455-457.
[5] 牟龙华, 邢锦磊. 基于傅里叶变换的精确频率测量算法[J]. 电力系统自动化, 2008, 32(23):67-70, 94. MOU Long-hua, XING Jin-lei. An accurate frequency measuring algorithm for power systems based on fourier transform[J], Automation of Electric Power Systems, 2008,32(23):67-70.
[6] BOGGESS A, NARCOWICH F J. A first course in wavelets with fourier analysis[M]. 2nd ed. Beijing:Publishing House of Electronics Industry, 2010.
[7] 王世一. 数字信号处理[M]. 2版. 北京:北京理工大学出版社, 2011:13-15.
[8] WERNICK M N, MORRIS G M. Effect of spatial coherence on knife-edge measurements of detector modulation transfer function[J]. Applied Ooptics, 1994, 33(25):5906-5913.
[9] JENQ Y C, CROSBY P B. Sinewave parameter estimation algorithm with application to waveform digitizer effective bits measurement[J]. IEEE Transactions on Instrumentation and Measurement, 1988, 37(4):529-532.
[10] 吴义华, 杨俊峰, 陈敬原, 等. 正弦信号四参数的高精度估计算法[J]. 中国科学技术大学学报, 2006, 36(6):625-629. WU Yi-hua, YANG Jun-feng, CHEN Jing-yuan, et al. High accuracy estimation algorithm for 4 parameters of sine-wave[J]. Journal of University of Science and Technology of China, 2006, 36(6):625-629.
