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.