Design of DDS Chirp Generator using FPGA

Synthetic Aperture Radar (SAR) is a remote sensing technology using microwaves. Microwaves have a longer wavelength than the size of particles in the atmosphere and are not affected by clouds and fog, making it possible to observe regardless of weather conditions and sunlight. In addition, high-resolution images can be obtained by virtually synthesizing antennas.In this imaging system, the pulse compression technique is used to improve the resolution in the range direction, i.e., the direction perpendicular to the direction of motion. The pulse compression technique emits a frequency-modulated signal called a chirp signal and generates an image based on the correlation between the reflected received signal and the transmitted signal.In this paper, we present an algorithm for generating the chirp signal using a phase accumulator called direct digital. A logic circuit has been created using Quartus Prime, and simulation results are presented.