基于广义S变换的空间锥体进动微多普勒分析

锥体进动特性是用于空间目标识别的重要依据之一.为了研究这一问题,提出一种基于广义S变换的空间锥体进动微多普勒特性分析方法.根据锥体进动的物理运动过程建立了相应的数学模型,推导出锥体进动微多普勒频率的理论表达式,并通过仿真结果验证其正确性.该模型采用共原点的目标多坐标体系,使其仅存在旋转关系,从而简化了模型的结构与计算复杂性.在此基础上,利用广义S变换实现了对模拟雷达进动回波的微多普勒特性分析.在不同信噪比条件下的仿真结果表明:该方法时频分辨性较好,而且具有较高的鲁棒性.

Micro-Doppler analysis of spatial coning precession based on generalized S transform

Precession characteristic is one of the significant properties for cone-shaped spatial target recognition. To analysis the micro-Doppler feature induced by precession, a method based on the generalized S transform was proposed. In the mathematical model of coning precession, the multi-coordinate system with the same origin was used to simplify model structure and computation complexity. Then the theoretical expression of the micro-Doppler due to precession was derived. The validity of the model was confirmed by computer simulation. Based on simulated radar data for precession cone, the generalized S transform was introduced and used to analyze the micro-Doppler feature in the condition of different signal to noise ratio (SNR). The experimental results in the joint time-frequency domain show that the method has large advantage in the time-frequency resolution, and is robust for the complicated micro-Doppler signal at low SNR.