基于光纤模式数据采集方案的阵列快拍成像雷达

阵列快拍成像雷达采用阵列天线雷达成像体制，通过高速微波开关切换和高速数据采集，可以同时实现对目标的空间分辨和时间分辨，即实现雷达快拍成像，该技术在飞行器平台的辅助导航、交通监测等领域具有广阔的应用前景。阵列快拍成像雷达的特点是能够快速成像，核心技术包括微波信号收发、高速数据采集与传输、实时成像处理及阵列天线高速微波开关切换。其中，高速数据采集与传输是实现快速成像是正确成像的关键，数据缺失会导致图像散焦。本文首先分析了阵列快拍成像雷达成像原理及信号采样对数据采集与传输系统的要求；继而提出了基于光纤传输模式的数据采集与传输系统方案，系统采用四路高速AD对雷达基带信号进行采样，在FPGA中进行复数运算，通过光纤通道传送到主控计算机，系统传输速率可以达到2.5Gbps；最后，通过阵列快拍成像实验验证了系统的性能。 

Array Snapshot Imaging Radar Based on Optical Fiber Data Acquisition and Transmission

Based on high-speed microwave switch and high-speed data acquisition, array snapshot imaging radar can simultaneously achieve spatial resolution and time resolution, that is, to achieve rapid radar imaging, which has wide application prospects in the fields of auxiliary navigation of aircraft platform, traffic monitoring. The main technology of snapshot imaging radar includes microwave signal transmission and reception, high-speed data acquisition and transmission, real-time imaging processing and array antenna high-speed microwave switch switching. And high -speed data acquisition and transmission is critical to achieve correct imaging which is related to the image focusing quality. In this paper, the imaging principle of array snapshot imaging radar and the requirement of signal sampling and data acquisition and transmission system are analyzed. Then, the data acquisition and transmission system based on optical fiber transmission mode is proposed, which uses four high-speed ADs to sample the radar baseband signal, achieves complex operation via FPGA, and transfers the echo to host computer via fiber channel. the system transfer rate can be up to 2.5 Gbps. Finally, through the performance of the system is verified via array snapshot imaging experiments.