一种精确判定多普勒信号极值点位置的方法  

A Precise Method to Estimate Location of Doppler Signal′s Extreme Value Points

作　　者：刘丹[1] 张丕状[1] 马春燕[1] 

机构地区：[1]中北大学信息探测与处理技术研究所,山西太原030051

出　　处：《激光与光电子学进展》2015年第7期47-51,共5页Laser & Optoelectronics Progress

基　　金：国防科工局项目

摘　　要：求解多普勒信号频率是测量高速运动目标速度的基础。极值法测量弹丸运动速度时,极值点携带了多普勒信号瞬时频率信息,所以要精确估算弹丸回波信号的频率,找准极值点的位置至关重要,传统的极值法测量精度受方法限制。提出采用二次曲线拟合的方法对回波信号进行去噪处理,根据二次函数求极值点的数学原理求出所有极值点,并对分段拟合算法产生的无效极值点进行准确剔除。通过分析实际测量的弹丸回波信号,提高了判定极值点位置的精度,为高精度测量运动目标速度奠定了基础。Solving the frequency of Doppler signal is the foundation for speed measurement of high-speed moving target. When measuring speed of the moving projectile by extremum, the extreme value point carries instantaneous frequency information of the Doppler signal. So it is very important to find the location of extreme value point when estimating the frequency of projectile echo signal accurately. The measurement precision of traditional extremum method is more restricted. A method of quadratic curve fitting is proposed to deal with the noise of echo signal, all the extreme value points are found out according to the principle of quadratic function, and invalid extreme value points produced by the piecewise fitting method are eliminated. Through the analysis of actually measured projectile echo signal, the accuracy for determining the position of extreme value point is improved and foundation for high precision measurement of moving targets is laid.

关 键 词：探测器 弹丸运动 多普勒信号 曲线拟合 极值点 

分 类 号：TJ012.1[兵器科学与技术—兵器发射理论与技术]