An FFT-based Algorithm for I/Q Imbalance Correction of Radar Sensors

A certain degree of I and Q imbalance in intermediate frequency signals is common in current integrated radar front-end chips. In the frequency domain processing of radar baseband signals, the complex signals composed of I and Q signals will appear as mirror signals, which will make the radar sensors detect false targets. In this paper, we propose an FFT-based I and Q imbalance correction algorithm, and the simulation results show that the algorithm can effectively complete the correction with high correction accuracy and high signal image rejection ratio by using fewer intermediate frequency signal sampling points. The correction algorithm proposed in this paper has some practical application value.