摘要
运动目标具有大加速度时,在一定的观测时间内,其瞬时多普勒频率是模糊的。若目标存在微动,相应产生的微多普勒会叠加于模糊的多普勒频率之上。这种现象常见于高速机动目标。针对提取具有大加速度微动目标的运动特征问题,该文提出一种参数估计方法。通过对目标多普勒频率的解模糊以及对目标整体运动的估计和补偿,提取目标的微多普勒分量,在此基础上估计目标的微动周期。基于仿真数据和实测数据的分析表明,该方法适用于估计大加速度机动目标的微动参数问题。
In a certain observation time duration, the instantaneous frequency of motion target with large acceleration is ambiguous. This case is usually met in flexible-motion target with high velocity. If target has micro-motion, it will cause micro-Doppler modulation which adds in the ambiguous Doppler frequency. In order to extract micro-motion feature of large acceleration target, a parameter estimation method is proposed. Through the ambiguity resolution of Doppler frequency and the estimation and compensation of bulk motion of target, micro-Doppler extraction is achieved. And then, micro-motion period is estimated. Analysis based on simulation and measured data show that the method is suit for micro-motion parameter estimation of large acceleration flexible-motion target.
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第1期82-87,共6页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61271417)~~
关键词
机动目标
微多普勒
运动补偿
参数估计
解模糊
Flexible-motion target
Micro-Doppler
Motion compensation
Parameter estimation
Ambiguity resolution
