全极化雷达幅相不一致对昆虫朝向估计的影响

昆虫雷达通过测量波束中昆虫的极化信息,估计昆虫头部朝向,进而完成对昆虫迁飞轨迹的监测。但是,全极化雷达系统中的非理想因素会影响到昆虫头部朝向的估计精度。为了研究全极化系统幅相不一致对朝向测量的影响,本文对昆虫极化散射特征和全极化系统建模,并对朝向误差进行分析,得到了朝向误差和通道间幅相不一致的关系。理论分析和仿真结果表明昆虫朝向误差同时与系统、自身散射特性以及真实朝向相关,系统幅相不一致会导致估计出来的昆虫朝向偏向极化方向。这些工作为全极化系统设计提供了新的思路。 

Influence of channel imbalance on insect orientation estimation in fully polarized radar

By measuring the polarization information of insects in the beam, entomological radar can estimate the orientation of insect, and then complete the trajectory monitoring of migratory insects. However, some non-ideal factors in the fully polarimetric radar system will affect the accuracy of insect orientation estimation. In order to study the influence of amplitude and phase imbalance between channels in fully polarimetric radar system on orientation measurement, the polarization scattering characteristics of insect and fully polarimetric system are modeled, the orientation error is analyzed, and the relationship between orientation error and channel imbalance is obtained. Theoretical analysis and simulation results show that the insect orientation error is related to the system, its own scattering characteristics and the real orientation, and the channel imbalance will cause the estimated insect orientation to deviate to the polarization direction. These works provide a new way for the design of fully polarimetric radar.