Design of Dual-Channel Frequency Memory and Retransmission Module Based on $\text{AXI}4+\text{DDR}3$

Digital Radio Frequency Memory (DRFM) is one of the key technologies that allow the radar system to accomplish electromagnetic interference. The dual-channel frequency memory and retransmission module with 5GSPS sampling rate, which is built in the “ADC + FPGA + dual DAC” hardware architecture, combines the multiport memory architecture of
$\text{AXI}4+\text{DDR}3$
and the internal BRAM resources of FPGA, and it is logically designed to be a dual-channel module with one receiving port and two transmission ports. The two channels are mutually independent and controllable and can support fast retransmission and deep memory of DRFM. Fixed delay and automatic delay are realized in the
$1\mu\mathrm{s}\sim 100\text{ms}$
range, with delay resolution <10ns.