A Systematical Error Compensation Method for an Ultra-Wideband Microwave Photonic SAR System

The combination of microwave photonic (MWP) technology and synthetic aperture radar (SAR) can realize ultra-wideband transmitted signals and thus provides ultra-high-resolution. Recently, an experimental MWP SAR system has been implemented at Aerospace Information Research Institute, Chinese Academy of Sciences. It can generate transmitting signals up to 14 GHz bandwidth and adopts dechirp-on-receive method at the receiving end. However, the power amplifier (PA) in front of the transmitting antenna induces an additional frequency-dependent error that needs to be compensated during signal processing. In this paper, we compensate for this specific systematical error utilizing the residual video phase (RVP) removal technique. Some simulated and experimental data processing results are presented to validate the effectiveness of the method.