Non-Linearity Compensation Algorithm for FMCW SAR

The effect of sinusoidal nonlinearity function in FMCW SAR system is investigated and phase error correction algorithm is addressed to detect target. The Mathematical explanation for non-linearity compensation in Synthetic Aperture Radar (SAR) system is presented with proper signal processing chain. This processing approach shows improvement in target detection in simulation results. The frequency modulated continuous wave synthetic aperture radar with 0.25 GHz bandwidth and center frequency of 2.4 GHz is considered. The frequency of error signal is 50 KHz with a variation of sine function. In this case, the sweeping time of VCO is 10msec. More than one target are considered in simulation at a time with their different position to investigate and verify the proposed approach for compensation of VCO non-linearity in frequency sweep in VCO.