基于相位积累的多段异频信号的频率估计算法  

Frequency estimation of multi-section different-frequency signal based on phase accumulation

作　　者：沈艳林[1] 涂亚庆[1] 刘良兵[1] 王慧[2] 

机构地区：[1]后勤工程学院信息工程系,重庆401311 [2]重庆邮电大学工商管理系,重庆400065

出　　处：《电子测量与仪器学报》2013年第1期64-68,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(61271449;61201450);重庆市自然科学基金(CSTC 2011BA2015;CSTC2012jja0877;CSTC2012jja1047)资助项目

摘　　要：多段信号的信息融合能够有效提高信号的频率估计精度。为扩展现有方法的适用范围，提出一种基于相位积累的多段异频信号的频率估计算法。算法通过生成异频分析参数矩阵克服了分段信号频率不等问题，实现了同频化处理；通过设计相位差补偿因子克服了分段信号相位不连续问题，达到了相位连续信号的频谱分析效果；通过搜索相位累积频谱的最大值获得了信号频率估计值。为验证算法的正确性，给出了详细的数学推导。仿真实验结果表明本文所提算法的频率估计误差约为现有方法的1／3～2／3，算法普适性强，频率估计性能稳定。Information fusion among multi-section signal can improve the frequency estimation effectively. To extend applicable range of existing methods, a frequency estimation algorithm of multi-section different-frequency signal based on phase accumulation is proposed. Firstly, the different-frequency analysis parameter matrix is generated to overcome the problem of unequal frequency. Then, the phase-difference compensating factor is designed to solve the problem of discon- tinuous phases and obtain the spectra as well as phase-continuous signal. Finally, the frequency estimation is gained by searching the maximum of phase accumulation spectra. To prove the validity of proposed algorithm, mathematical deriva- tion is given in detail. The simulation experiment results demonstrate that the error of the proposed algorithm is about be- tween 1/3 and 2/3 of that of the existing method and the proposed algorithm has better universality and more stable fre- quency estimation performance.

关 键 词：频率估计 相位积累 多段信号 相位差补偿 

分 类 号：TN911.7[电子电信—通信与信息系统]