去调频处理中空变相位误差补偿方法

调频连续波具有较长的脉宽和较大的信号带宽,通常采用去调频的处理方式,但是,去调频的处理会引入空变的相位误差。从去调频的处理方式入手,根据发射信号相位误差缓变的特点,提出了依据发射信号相位误差模型补偿空变相位误差的方法,并在理论上对该方法进行了推导。该补偿方法分为两步,从差频信号中去除发射信号相位误差,在残余视频相位误差校正之后,通过与补偿函数相乘去除剩余的相位误差。仿真和实测的实验结果表明,该方法能够克服目标距离的限制,有效地补偿空变相位误差带来的影响,提高脉压水平。提出的误差补偿方法能够很好地平衡系统负载、误差补偿精度和算法开销,具有较强实用性。

Range-dependent phase error compensation of dechirp

To reduce the pressure of data processing, the dechirp operation is adopted. However, dechirp will result in range-dependent phase errors in the beat signal. We propose an algorithm to compensate the range-dependent phase error using the phase error extracted from the transmitted signal with the supposing of that the phase error varies slowly. The compensation approach is executed in two steps: first, compensate the phase error involved by the transmitted signal after dechirp; second, compensate the residual phase error after RVP correction. Both the simulation and the real data experiments suggest that the proposed algorithm is effective.