天基分布式雷达相位估计与同步方法

Phase estimation and synchronization for distributed aperture satellite radar

分布式全相参雷达是一种新体制、颠覆性雷达技术,可将若干单元雷达进行信号处理级合成处理,实现N 3信噪比增益,可突破雷达功率孔径积的限制。由于星载平台雷达系统各单元间距较远,星间无线相位估计与同步则成为核心问题之一。本文建立分布式相位同步理论模型,通过对相位误差分析,提出一种循环往返式相位同步方式。相比于主-从相位同步方式,打破了分布式中心站限制,提高了系统抗干扰能力和算法稳健性。仿真结果证明了方法的有效性。

Distributed Aperture Fully Coherent(DAFC)radar is a kind of new and overturning technology,which can achieve synthetized signal processing for N 3 Signal to Noise Ratio(SNR)gain and break the limit of power-aperture product of radar.Due to the long distance between units of the satellite radar system,the wireless phase estimation and synchronization become one of the key problems.A theoretical model of distributed radar phase synchronization is established in this paper.A new phase synchronization method in the circular way is also proposed based on phase error analysis.Compared with Principal-Subordinate method,it eliminates the restriction on center junction in DAFC,and improves the anti-interference ability and the robustness of the algorithm.The simulation results validate the effectiveness of the proposed method.