关键词: FPGA, DDS技术, 基带信号产生模块

Abstract: The signal transceiver module in the radar system needs to generate baseband signals internally. To meet this requirement, the baseband signal generator IP core is designed based on direct digital frequency synthesis (DDS) technology, enabling customization of starting slope and starting frequency. The output frequency of the IP core is designed according to the characteristics of linear frequency modulation signals. Combining phase truncation method with CORDIC algorithm, the sine-cosine lookup table of the DDS module is designed to reduce resource occupancy and power consumption and enhance operational speed. Simulation results demonstrate that the designed IP core can normally output sine and cosine waveforms at different frequencies as well as linear frequency modulation signal waveforms, and and can realize customizable adjustments, and showing show high flexibility. Compared to generating mixed-frequency waveforms through multiple DDS superposition, this IP core occupies fewer resources while maintaining practical value.

Key words: FPGA, DDS technology, baseband signal generation module