Development of chirp signal generator for micro satellite on-board synthetic aperture radar

For L-band micro satellite on board SAR system, the suitable chirp signal generator for this system is needed. In this paper, the chirp signal generator with direct digital synthesizer (DDS) is considered instead of the memory map based chirp signal generator. Furthermore, to overcome the limitation of clock frequency of the space component, parallelized DDS (PDDS) method is used. However, phase error is one of the problem to implement DDS chirp signal generator. Therefore, we propose a novel method to compensate this error. As a result, the output performance of the signal is enhanced using the proposed phase error compensation method.