一种宽带雷达系统通道误差校正方法

在不改动宽带雷达内定标系统硬件的情况下，提出了一种校正宽带雷达系统传递函数误差及IQ失配的正交解调误差的新方法。通过对雷达系统通道误差特点的分析，采用正负调频率的线性调频信号作为定标信号获取雷达系统传递函数，以此构建雷达回波校正函数并对雷达接收回波进行误差校正。在定标系统和雷达回波存在噪声的情况下，分析了雷达系统输出信号经本文方法校正后对其进行脉冲压缩后的信噪比。仿真实验验证了方法的有效性。

New calibration method for channel errors of wideband radar systems

A new method is developed to calibrate the non-ideal transfer function and IQ imbalances in quadrature modulate/demodulate systems which frequently occur in wideband radar systems, without changing the hardware of the radar calibration system. Based on analyzing channel errors in radar systems, two chirp signals with opposite chirp rate are adopted as calibration signals to acquire the true channel transfer function. And a calibration function is constructed to correct the erroneous echo due to the existence of the non-ideal transfer function and non ideal quadrature modulate/demodulate systems. Taking account of the noise in both the calibration system and the radar echo, the signal to noise ratio (SNR) after the pulse compression of the calibrated echo is analyzed. Simulation results the effectiveness of the proposed technique.