SAR回波信号模拟器幅相误差实时校正方法

Real-Time Amplitude and Phase Error Correction of SAR Echo Signal Simulator

合成孔径雷达(SAR)回波信号模拟器不可避免地存在通道幅相误差,会影响对雷达点目标成像性能的准确评估,因此对模拟器幅相误差实时校正具有重要意义。由于模拟器系统传递函数不具有共轭对称性,要满足在实时工作模式下用硬件实现幅相误差校正,既要求收敛速度快,又要求优化性能好,就需要采用一种快速有效的算法来设计复系数FIR滤波器。提出了复Remez算法和遗传算法相结合的复系数FIR滤波器设计方法,最后给出用此方法实现SAR回波信号模拟器幅相误差校正的实例。

It＇s unavoidable that the amplitude and phase errors exists in the synthetic aperture radar（SAR） echo signal simulator,which may affect the accurate performance evaluation of the SAR point target imaging.It＇s necessary to correct the amplitude and phase errors of the simulator in real-time.The transfer function the simulator system does not have conjugate symmetry,so that,to meet the requirements of amplitude and phase error correction in real-time simulation mode,a fast efficient algorithm to design complex coefficient FIR filters is needed for demands of fast convergence and also optimal performance.A genetic algorithm based on the complex Remez algorithm for designing the complex coefficient FIR filter is presented.A successful practical example of the amplitude and phase error correction of SAR echo signal simulator is given.