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 雷达学报  2018, Vol. 7 Issue (3): 313-319  DOI: 10.12000/JR17125 0

### 引用本文

Li Yuqian, Yi Jianxin, Wan Xianrong, et al.. Helicopter rotor parameter estimation method for passive radar[J]. Journal of Radars, 2018, 7(3): 313-319. DOI: 10.12000/JR17125.

### 文章历史

(武汉大学电子信息学院   武汉   430072)

Helicopter Rotor Parameter Estimation Method for Passive Radar
Li Yuqian, Yi Jianxin, Wan Xianrong, Liu Yuqi, Zhan Weijie
(School of Electronic Information, Wuhan University, Wuhan 430072, China)
Foundation Item: The National Key Research and Development Program (2016YFB0502403), The National Natural Science Foundation of China (61701350, 61331012), Hubei Province Science and Technology Plan (2015BCE075, 2016CFA061), Postdoctoral Innovative Talent Support Program (BX201600117)
Abstract: The passive radar is a new radar system based on third-party non-cooperative radiation sources, which has unique advantages in micro-Doppler target classification and recognition. Its characteristics determine that the micro-Doppler effect parameter estimation method must have a good anti-noise performance and a small amount of calculation. In view of these considerations, this study presents a new idea of helicopter rotor parameter estimation using an echo flicker in the time-frequency domain based on the micro-motion signal model for the passive radar. The echo flicker parameters are extracted by accumulating the amplitudes of the positive and negative frequency axis data in the time-frequency diagram. The dictionary matrix is constructed based on the inherent characteristics of the micro-motion signals. The blade length, blade number, rotor speed, and other parameters are estimated using the orthogonal matching pursuit algorithm. Compared with the method based on the conventional Hough transform, the proposed method is more accurate and more rapid. The simulation and experimental results prove the feasibility of this method.
Key words: Passive radar    Micro-Doppler    Echo flicker    Time-frequency analysis    Orthogonal matching pursuit algorithm
1 引言

2 外辐射源雷达直升机旋翼回波模型的建立

 图 1 外辐射源雷达直升机旋翼回波模型 Fig.1 Model of helicopter rotors echo for passive radar

${f_r}$ 为叶片转速， $L$ 为叶片长度， $N$ 为叶片数量，整数 $k$ $(0 < k \le N)$ 表示第 $k$ 个叶片， ${\varphi _0}$ 为叶片初相， $\lambda$ 为照射源信号波长。

3 直升机旋翼参数估计 3.1 时频分析提取闪烁信号参数

 图 2 旋翼回波信号时频分析 Fig.2 Time-frequency analysis of rotors echo

3.2 OMP估计直升机旋翼参数

3.3 直升机旋翼参数估计流程

4 仿真验证 4.1 仿真结果分析

 图 4 常规Hough变换参数估计结果 Fig.4 Parameter estimation by traditional Hough transform

4.2 计算复杂度分析

5 实验结果 5.1 实验场景

 图 5 实验场景图 Fig.5 Experimental scene map
5.2 实验结果分析