An Initial Implementation of a Direct Digital Synthesizer Module for Radar Applications

This paper presents an implementation of a DDS based waveform synthesizer design using a wave table. The wave table contains 1024 8-bit points of a single period segment of a waveform. Using a constant access rate to read from the table, the frequency and shape of the waveform can be altered by either reading some points multiple times or skipping over some points. The waveform synthesizer was designed with Verilog IIDI, and implemented through the Altera DE1-SoC board. The program was designed to produce sawtooth, sine, square, and triangle waves in the frequency range of 100 Dz. to 10 kHz. Future iterations of this design will implement frequency modulation for use in radar applications in the Remote Sensing Center at the University of Alabama.