基于瞬时频率估计的进动锥体目标微多普勒频率提取方法
doi: 10.11999/JEIT140985
Micro-Doppler Frequency Extraction for Cone-shaped Target with Precession Based on Instantaneous Frequency Estimation
-
摘要: 该文针对进动锥体目标的微动特性提取,建立等效散射点模型下的微多普勒频率与目标运动参数关系。结合进动调制的微多普勒频率近似正弦变化规律的特点,提出基于瞬时频率估计和随机抽样一致性(RANSAC)的进动目标微多普勒频率提取方法。该方法将回波信号分为若干段,每一段的回波信号近似为若干线性调频(LFM)信号分量之和,通过调频Relax算法估计各信号分量的瞬时频率,并通过随机抽样一致性算法估计散射点的微多普勒曲线。基于仿真数据和电磁计算数据的实验验证了该方法的有效性及稳健性。Abstract: Based on the equivalent scatter point model, the relationship between the micro-Doppler frequencies and the motion parameters of the cone-shaped target with precession is established. Due to the approximately sinusoidal form of the micro-Doppler frequency modulation induced by the precession, an approach to extract the micro-Doppler frequency of the target with precession based on the instantaneous frequency estimation and the RANdom SAmple Consensus (RANSAC) is proposed. In this method, the target echo signal is first divided into several segments. Then each segment of the echo signal approximates to the sum of several components of the Linear Frequency Modulation (LFM) signal, and an algorithm based on the extended Relax method is used to estimate the instantaneous frequency of the each LFM signal. Thus the micro-Doppler curve of each equivalent scatter point is estimated by the RANSAC algorithm. In the simulation experiments, the performance of the proposed method is evaluated via the simulation data and electromagnetic computation simulation data.
计量
- 文章访问数: 1552
- HTML全文浏览量: 157
- PDF下载量: 642
- 被引次数: 0