基于经验小波变换的目标加速度估计算法

发布时间：2018-05-21 06:08

本文选题：径向加速度 + 非平稳信号　；参考：《北京航空航天大学学报》2015年01期

【摘要】：加速度会使目标回波信号的频谱展宽甚至偏移,使传统脉冲雷达测速方法不能准确估计信号的多普勒频率.为了克服目标的加速度对脉冲雷达测速的影响,提出了一种基于经验小波变换(EWT)的径向加速度估计算法.对回波信号进行EWT变换和能量型频率主成分提取方法得到回波信号瞬时频率,并利用抗差最小二乘拟合得到相位高阶系数,进而估计目标径向加速度.利用估计的加速度对信号频谱进行补偿就能准确估计信号的多普勒频率.仿真表明EWT方法是一种高精度快速算法,且估计误差最接近待估参数的C-R下界.实测高速飞行器脉冲雷达I/Q数据验证表明,EWT算法估计的加速度精度优于0.4 m/s2.该算法可应用于脉冲雷达实时加速度估计.
[Abstract]:Acceleration will widen or even offset the frequency spectrum of the target echo signal, so the traditional pulse radar velocimetry method can not accurately estimate the Doppler frequency of the signal. In order to overcome the effect of target acceleration on pulse radar velocimetry, a radial acceleration estimation algorithm based on empirical wavelet transform (EWT) is proposed. The instantaneous frequency of echo signal is obtained by EWT transform and principal component extraction of energy type frequency, and the phase higher order coefficient is obtained by robust least square fitting, and the radial acceleration of target is estimated. The Doppler frequency of the signal can be accurately estimated by compensating the signal spectrum with the estimated acceleration. Simulation results show that the EWT method is a fast algorithm with high accuracy and the estimation error is the closest to the C-R lower bound of the parameters to be estimated. The I / Q data of the measured high-speed aircraft pulse radar show that the acceleration accuracy of the EWT algorithm is better than that of 0.4 m / s ~ (2). This algorithm can be applied to real-time acceleration estimation of pulse radar.
【作者单位】：北京跟踪与通信技术研究所;
【基金】：国家自然科学基金资助项目(61101070) 总装备部预先研究资助项目
【分类号】：TN957.51

【参考文献】