雷达回波模拟器通道幅相误差校正方法仿真

Simulation of Amplitude and Phase Error Correction Method for Radar Echo Simulator Channel

针对雷达模拟器产生雷达回波信号的幅相误差问题,提出了设计复系数的FIR滤波器进行校正的方法。首先,分析误差来源,用频谱比对法,根据输入信号和模拟出的回波信号得到模拟器的通道幅相特性即传递函数。其次,滤除杂波以后,运用复Remez算法和非线性规划的方法,设计FIR滤波器的复数系数,得到用于校正的FIR滤波器。最后,用matlab对回波数据和校正器进行仿真验证。验证结果显示,通过该方法能够有效的将回波信号的相位误差控制在2.58°以内,幅度误差控制在0.062dB左右,具有实用性。

Aiming at the problem of amplitude and phase error of radar echo signal generated by radar simulator,a FIR filter with complex coefficients was designed for correction.Firstly,the source of error was analyzed,and the amplitude and phase characteristics of the channel of the simulator,namely the transfer function,were obtained according to the input signal and the simulated echo signal by using the spectrum comparison method.Secondly,after filtering the clutter,the complex FIR filter coefficients were designed by using the Remez algorithm and the nonlinear programming method,and then the FIR filter was used to correct.Finally,Matlab was used to verify the echo data and calibrator simulation.Verification results show that this method can effectively control the phase error of echo signal within 2.58°and amplitude error within 0.062 dB,which is practical.