Hu, Zijian; Zhao, Zeping; Wang, Hanyu; Dang, Xiying; Chen, Man; Zhang, Weijie; Liu, Jianguo Source: SSRN, June 19, 2024; ISSN: 15565068; DOI: 10.2139/ssrn.4870749; Repository: SSRN

Author affiliation:

Institute of Semiconductors, Chinese Academy of Sciences, Beijing; 100083, China

The College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing; 100049, China

Abstract:

Radar target simulation is essential for radar development. In this paper, a microwave photonic radio frequency memory (RFM) is proposed and experimentally verified. Both range and velocity of targets are simulated simultaneously. The input radio frequency (RF) signals are delayed and stored in a hybrid optical/electrical recirculating loop with a 4-bit binary optical true time delay line (OTTDL), allowing multiple replications and tunable delay resolution. And Doppler frequency shift (DFS) of the delayed signals is achieved by a Mach-Zehnder modulator (MZM) and cascaded acousto-optic modulators (AOMs). Experimental results demonstrate that the output RF signals with tunable delay time and DFS are obtained. The delay resolution ranges from 0.045us to 7.576us, and 30 circulations are realized. Meanwhile, the spurious suppression ratio of DFS is greater than 40dBc within the tuning range of 10Hz-10MHz. The solution provides 16 delay resolutions and a wide range of high-precision DFS.