一种雷达脉冲信号相位差变化率测量的新方法  

New measurement method for phase difference change rate of radar pulse signals

作　　者：万方[1] 丁建江[1] 郁春来[1] 

机构地区：[1]空军雷达学院,湖北武汉430019

出　　处：《系统工程与电子技术》2011年第6期1257-1260,1304,共5页Systems Engineering and Electronics

基　　金：2010空军装备科研项目(KJ2010202);信息综合控制国家重点实验室项目资助课题

摘　　要：接收信号相位差变化率的高精度估计是基于质点运动学原理单站无源定位与跟踪的一项关键技术。针对雷达脉冲信号,建立了接收信号相位差模型,分析了相位差变化率的特点,提出了一种相位差变化率的数字测量新方法,直接对各阵元接收的信号进行A/D采样,采用数字信号处理的方法估计相位差变化率。通过离散傅里叶变换和复数乘积运算将相位差变化率的测量问题转换为频率测量问题,利用多个脉冲信息提高了参数估计的精度,根据相位的无模糊测量获得相位差变化率加权最小二乘估计。仿真实验表明,该方法具有较低的信噪比门限,在高于信噪比门限时,其估计精度接近Cramer-Rao下限。An accurate estimation of the phase difference change rate from received signals is a key technology in the passive locating and tracking system of single observer based on particle kinematics theory.Aiming at radar pulse signals,a model of phase difference is established,the feature of the phase difference change rate is discussed,a new digital measurement method for measuring phase difference change rates is proposed,receiving signals are sampled directly from multiple-elements and the phase difference change rate is estimated by using digital signal processing method.The phase difference change rate measure problem is translated into frequency measure problem by discrete Fourier transform and complex number multiply operation.The parameter estimation precision is improved by using multi-pulses information.The weighted least square estimation of the phase difference change rate is obtained from unwrapped phase.The simulation results show that this method has low signal-to-noise ratio threshold,and the precision of the phase difference change rate approaches the Cramer-Rao lower bound.

关 键 词：单站无源定位 相位差变化率 测量方法 测量误差 

分 类 号：TN953[电子电信—信号与信息处理]