基于相位分析CAPES的信号参数估计方法

Signal Parameter Estimation Using the Phase-Analysis Based CAPES Method

由于存在栅栏效应,传统方法对单频信号参数估计时可能会存在精度下降问题。针对这一问题该文提出了一种基于相位分析的联合幅度与相位估计(CAPES)方法。采样数据的不同数据段之间因延时会存在相位差,该方法在估计信号参数时利用两数据段的相位差包含的信号频率信息来减小频率估计的偏差,进而提高信号频率、幅度和相位的估计精度。仿真实验表明该方法的参数估计精度高于传统的CAPES方法。将该方法应用于超视距雷达的海杂波对消中,实测数据的处理结果也表明了该方法的有效性。

A phase-analysis based Capon-amplitude phase estimation of a sinusoid （CAPES） method is proposed for parameter estimation of single frequency signal. The proposed method uses the phase difference between two data segments to reduce frequency estimation error caused by the picket fence effect and therefore to improve the estimation accuracy of frequency, amplitude and phase. Computer simulation indicates the new method can achieve better parameter estimation performance than that of the traditional CAPES method. We applied the proposed method to experimental data collected by a trail over-the-horizon radar （OTHR） and the results validates the effectiveness of the proposed method.