基于窄带雷达组网的空间锥体目标特征提取方法

摘要

The micro-Doppler modulation caused by precession is considered as an important signature for the discrimination of space cone-shaped target. A novel feature extraction method for precessing cone-shaped target with narrow-band radar networks is proposed in this paper. Based on analysis of the scattering properties of the cone-shaped target, this paper first derives the scattering centers’ theoretical Instantaneous Frequency (IF) variations induced by precession, and the IF variations obtained from multiple radar aspects are matched according to their spectrum entropy. Then according to the properties of IF variations of the top and bottom scattering centers under different radar aspects, the precession and geometry feature extraction method is proposed for estimating the target’s parameters, such as height, bottom radius, location of barycentric, precession angle etc. Experiments based on the electromagnetic computation data verify the validness and accuracy of the proposed method.%进动引发的微多普勒调制可作为空间锥体目标识别的重要依据，针对此该文提出一种基于窄带雷达组网的进动锥体目标特征提取方法。该文首先根据目标散射特性推导了进动引发的散射点理论瞬时频率变化，并根据频谱熵实现了多个雷达视角观测下的散射点瞬时频率变化的匹配；然后依据不同视角下锥顶与锥底散射点瞬时频率变化关系，提出一种目标进动与尺寸特征联合提取的新方法，实现了目标高度、底面半径、质心位置、进动角等参数的高精度估计。基于电磁计算数据的实验结果验证了该文所提方法的有效性和精确性。