无时钟同步下双基地雷达的相位误差补偿算法

A Phase Error Compensation Algorithm for Bistatic Radar Without Clock Synchronization

在双基地雷达中,由于时钟源不同步会给接收信号上带来载波频率偏差以及时间同步误差等影响因素,影响精确定位和慢速微多普勒检测。针对这些影响因素,提出一种基于直达波相位的相位补偿算法和基于距离多普勒谱频域对消的联合处理算法。该算法不需要双基地系统有共用时钟源。首先,通过直达波的相位对所有接收信号做相位补偿,抵消了载波频率偏差带来的相位误差;再利用距离多普勒谱的数据在多普勒维上做频域对消,有效地去除了时间同步误差带来的旁峰干扰。该算法复杂度低、易于实现,经过理论推导和实验验证,验证了该算法的有效性。

In the bistatic radar the unsynchronized clock source will bring carrier frequency deviation and time synchronization error to the received signal which may affect the accurate positioning and slow micro-Doppler detection.Aiming at these factors a combined processing algorithm is proposed based on phase compensation of direct wave phase and frequency-domain cancellation of the range Doppler spectrum.The algorithm does not need a shared clock source for the bistatic system.Firstly all received signals are Scompensated by the phase of the direct wave to offset the phase error caused by carrier frequency deviation.Then the side-peak interference caused by the time synchronization error is effectively eliminated by frequency-domain cancellation using the data of range Doppler spectrum.This algorithm has low complexity and is easy to implement.The validity of the algorithm is verified by theoretical derivation and experiments.