摘要
针对旋翼类目标特征参数提取问题,提出利用逆Radon变换估计旋翼目标微动参数的方法.首先建立了单旋翼直升机雷达回波的散射点模型,并基于线性调频信号,分析了回波的微动特性;其次研究了基于逆Radon变换在低信噪比条件下对旋翼目标微动参数估计的算法;最后进行了仿真与分析.仿真结果表明,与传统方法相比,本文所提方法在不同信噪比条件下均能实现对参数的稳健估计.
Aiming at the extraction of rotor-like targets’ feature parameters, this paper proposes a method of estimating rotor targets’ micro-motion parameters by use of inverse Radon transform. Firstly, the paper establishes the scatter point model of the radar echo of single-rotor helicopters, and based on the linear frequency modulation(LFM) signal, analyzes the micro-motion characteristics of echoes. Secondly, the paper makes a study on an algorithm based on the inverse Radon transform for the estimation of rotor targets’ micro-motion parameters at low signal-to-noise ratio(SNR). Finally, the simulation and analysis are carried out. The results show that compared with the traditional method, the proposed method can achieve robust parameter estimation under the different SNR conditions.
作者
周毅恒
韦旭
杨军
ZHOU Yiheng;WEI Xu;YANG Jun(Air Force EarlyWarning Academy,Wuhan 430019,China)
出处
《空军预警学院学报》
2019年第6期391-395,共5页
Journal of Air Force Early Warning Academy
基金
国家自然科学基金资助项目(61671469)
关键词
旋翼目标
微动
逆Radon变换
时频分析
参数估计
rotor targets
micro-motion
inverse Radon transform
time-frequency analysis
parameter estimation
