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电子学报  2013 

GPS驯服中无偏滑动平均滤波算法的研究

DOI: 10.3969/j.issn.0372-2112.2013.02.032, PP. 412-416

Keywords: GPS,驯服,数字锁相环,无偏滑动平均滤波,线性回归估计

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Abstract:

分析已有GPS驯服中滤波算法的特点,提出了基于GPS的实时频率误差处理及状态估计的无偏滑动平均滤波算法.该方法继承了普通滑动滤波算法低噪声特点,且用线性回归估计补偿了普通滑动滤波算法的偏差,利用该方法滤除频率测量误差中的频率偏差和多通道GPS接收机秒信号(GPS1PPS)的锯齿误差,并预报晶振状态.MATLAB仿真和实际测试结果都证明了无偏滑动滤波算法比普通滑动滤波有效,提高了晶振频率的长期稳定度和准确度,实际系统中恒温晶振OXCO-131的长期频率稳定度的Allan方差提高了约三个数量级,达到3.5E-12/d.

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