无人机载SAR实时信号处理系统设计

Design of Real-Time Signal Processor for UAV-Borne SAR

针对合成孔径雷达实时成像处理中数据量大、数据吞吐率高、成像算法实现复杂等特点,设计了适合于无人机载SAR实时信号处理系统的硬件平台和实时信号处理算法流程。该信号处理系统包括一块带有AD采集功能的接口板和两块以TS201为核心处理器的信号处理板。考虑到实时性要求和无人机平台的不稳定性,设计了一种结合惯导和回波数据进行运动补偿的改进型RD成像算法。在无人机平台上成功稳定地实现大面积连续实时成像,证明信号处理系统稳定可靠,实时信号处理算法可行。

For solving the SAR imaging problems in real-time processing,such as huge data volume, high IO bandwidth and high algorithm complexity,a real-time signal processing flow and a hardware structure for UAV-borne SAR is designed.The hardware structure consists of an interface board with function of AD sam-pling and two signal processing boards based on TS201.Considering the real-time demand and the instability of UAV platform,an advanced RD algorithm is proposed in which motion error is compensated by both GPS and signal echo.The large area of consequent real-time SAR images are given on the UAV platform,which demonstrates the reliability of the processor and the feasibility of the real-time SAR imaging algorithm.