雷达目标一维全极化特征提取方法

One-dimensional Fully Polarimetric Characteristic Extraction Method of Radar Targets

雷达目标的高分辨和全极化信息在微波遥感、目标分类、识别等领域具有重要应用。为准确提取运动目标一维全极化高分辨散射特征,基于同时极化测量体制原理,设计了全极化正交频分复用(OFDM)波形,并给出了对应的信号处理算法。首先,建立了全极化OFDM雷达的发射信号和接收信号模型,利用子载波正交性消除不同极化通道间的互扰;然后,利用全极化MUSIC(P-MUSIC)算法得到一维距离像,提取出散射中心的全极化信息,并分析了目标运动对波形正交性能的影响;最后,利用某目标模型的暗室测量数据进行仿真实验,验证了相关处理算法的有效性,分析了测量性能。该研究对于设计新体制极化成像雷达具有参考意义。

Target high resolution and fully polarimetric information is of important application in such fields as remote sens- ing, target classification, recognition and so on. In order to extract the one-dimensional fully polarimetric and high resolution of moving targets, fully polarimetric Orthogonal Frequency Diversion Multiplex （OFDM） waveform is designed, based on the principle of simultaneous polarization measurement scheme. Its signal processing algorithm is advanced. Firstly, the fully po- larimetric OFDM transmitted and received signal models are established. Using the orthogonality of each sub-carriers, the cou- pling interference between different polarization channels can be eliminated. Then fully polarimetric MUSIC （P-MUSIC） algo- rithm is used to obtain target high resolution range profile and extract the fully polarimetric information of each scattering centers. Meanwhile, target movement effect on sub-carrier orthogonality is analyzed. Finally, simulations are performed using the meas- ured data of a target model in anechoic chamber to verify the effectiveness of corresponding signal process, and its measurement performance is also simulated. This study here is of valuable reference for designing new polarimetric imaging radar system.