对CIC(Cascade of Integrators Comb)滤波器的改进,是在尽量不改变滤波器简易性的情况下,尽可能的改善滤波器的滤波效果,Gordana Jovanvic-Dolecek等人先后提出了不同的改进方法,通过锐化滤波器,相位分解等方法来改进滤波器性能。本文...对CIC(Cascade of Integrators Comb)滤波器的改进,是在尽量不改变滤波器简易性的情况下,尽可能的改善滤波器的滤波效果,Gordana Jovanvic-Dolecek等人先后提出了不同的改进方法,通过锐化滤波器,相位分解等方法来改进滤波器性能。本文比较了相关的几种方法,并在此基础上提出一种改进的实现框图,采用此方法可以在改善滤波器性能的基础上,最大限度的减少资源消耗。展开更多
Array calibration is important in engineering practice. In this paper, fast calibration methods for a ULA's gain and phase errors both in far and near fields are proposed. In the far field, using a single sound so...Array calibration is important in engineering practice. In this paper, fast calibration methods for a ULA's gain and phase errors both in far and near fields are proposed. In the far field, using a single sound source without exact orientation, this method horizontally rotates the array exactly once, performs eigen value decomposition for the covariance matrix of received data, then computes the gain and phase error according to the formulas. In the near field, using the same single sound source, it is necessary to rotate the array horizontally at most three times, build equations according to geometric relations, then solve them. Using the formula proposed in this paper, spherical waves are modified into plane waves. Then eigen values decomposition is performed. These two calibration methods were shown to be valid by simulation and are fast, accurate and easy to use. Finally, an analysis of factors influencing estimation precision is given.展开更多
文摘对CIC(Cascade of Integrators Comb)滤波器的改进,是在尽量不改变滤波器简易性的情况下,尽可能的改善滤波器的滤波效果,Gordana Jovanvic-Dolecek等人先后提出了不同的改进方法,通过锐化滤波器,相位分解等方法来改进滤波器性能。本文比较了相关的几种方法,并在此基础上提出一种改进的实现框图,采用此方法可以在改善滤波器性能的基础上,最大限度的减少资源消耗。
文摘Array calibration is important in engineering practice. In this paper, fast calibration methods for a ULA's gain and phase errors both in far and near fields are proposed. In the far field, using a single sound source without exact orientation, this method horizontally rotates the array exactly once, performs eigen value decomposition for the covariance matrix of received data, then computes the gain and phase error according to the formulas. In the near field, using the same single sound source, it is necessary to rotate the array horizontally at most three times, build equations according to geometric relations, then solve them. Using the formula proposed in this paper, spherical waves are modified into plane waves. Then eigen values decomposition is performed. These two calibration methods were shown to be valid by simulation and are fast, accurate and easy to use. Finally, an analysis of factors influencing estimation precision is given.
