改进的乘积型核函数二次调频信号的参数估计

发布时间：2018-03-31 16:02

本文选题：信号处理　切入点：乘积型核函数　出处：《电子与信息学报》2014年11期

【摘要】：该文提出一种基于改进乘积型核函数的二次调频信号的参数估计方法。首先,对信号乘以自身的共轭反转并做相位匹配变换,通过积累后信号最大值位置得到信号的调频率估计值;然后,再补偿掉原信号的调频率,对解调频(dechirp)后的信号构造新的乘积型核函数,并变换到2维时间-时延域,沿时间和时延轴分别做相位匹配变换和傅里叶变换,在变换后的调频率变化率-频率平面通过最大值的位置即可同时得到调频率变化率和中心频率的估计值,对补偿掉相位的信号取均值并求模得到幅度值,从而实现二次调频信号的参数估计和重构。可见,该方法避免了对所有相位参数的迭代搜索,提高了运算效率。最后,对单分量和多分量二次调频信号的仿真结果证明了该方法的有效性。
[Abstract]:In this paper, a parameter estimation method for QFM signal based on improved product kernel function is proposed. Firstly, the signal is multiplied by its own conjugate inversion and the phase matching transformation is performed. The estimation of the modulation frequency of the signal is obtained by the maximum position of the accumulated signal, and then the modulation frequency of the original signal is compensated, and a new product kernel function is constructed for the signal after the dechirp is untuned, and then converted to the two-dimensional time-delay domain. Phase matching transform and Fourier transform are made along the time and time delay axis respectively. The frequency change rate and the center frequency can be estimated at the same time when the frequency plane passes through the position of the maximum value. The average value of the signal compensating phase is taken and the amplitude value is obtained, so that the parameter estimation and reconstruction of the secondary frequency modulation signal are realized. It can be seen that this method avoids the iterative search of all phase parameters and improves the computational efficiency. The simulation results for single and multi-component secondary frequency modulation signals show the effectiveness of the proposed method.
【作者单位】：西安电子科技大学雷达信号处理国防科技重点实验室;
【基金】：国家自然科学基金(61001211,61303035) 航空基金(20110181004) 中央高校基本科研业务费(K5051202016)资助课题
【分类号】：TN911.23

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