研究了雷达运动目标的信息获取问题,提出了运动目标极化散射矩阵瞬时测量方法。雷达正交双极化天线同时发射正、负调频斜率线性调频信号,目标的正交双极化回波分别与2个线性调频信号进行匹配滤波,利用正、负斜率线性调频信号的模糊函数特性测量目标时延和多普勒频移,通过求解线性方程组消除极化-多普勒耦合,精确得到目标极化散射矩阵的4个元素。该方法可以在单个脉冲周期内同时获取目标的距离信息、速度信息和极化信息。仿真实验验证了该方法的有效性。

In this paper,a method is proposed for the real time measurement of polarization scattering matrix of moving target.The method is considered and analyzed,through using orthogonal signals.A polarimetric radar simultaneously transmits a pair of chirp signals with opposite chirp frequency slopes on two orthogonal polarized channels,independently.The received signal on each orthogonally polarized channel is correlated with both transmitted waveforms.Using the property of ambiguity function of chirp signal pair,we obtain the time delay and Doppler shift.Then,the four elements of polarization scattering matrix are retrieved by solving a linear equation system to eliminate the influence of Doppler shift.This method can obtain time delay,Doppler shift and polarization scattering matrix in one pulse duration.Simulation verifies its effectiveness.

TN957.5