A modified SAR range-Doppler algorithm with Gaussian frequency waveforms

High-resolution synthetic aperture radar (SAR) imaging based on airborne representation has attracted much attention and considerable interest in many remote-sensing fields due to its potential for improving the data quality of various applications. To obtain the intended resolution, different effective algorithms have been proposed and improved by using several techniques, methods, and modifications of the radar waveforms. The range-Doppler is one of these algorithms where different waveforms are used to achieve the focusing of targets, especially chirp signals. In this article, we propose the use a new modulation called Gaussian linear frequency modulation to perform the Gaussian range-Doppler algorithm and compare its performance with the conventional range-Doppler algorithm. The comparison is carried out in several bands of the SAR. Also, the effectiveness of the proposed algorithm is performed and discussed for a simple point target. The simulation results show that the proposed algorithm can improve significantly the target focusing.