120 GHz and 240 GHz Si-Ge FMCW radar for high resolution close range SAR imaging

A 3D close range Synthetic Aperture Radar system based on the Range Migration Algorithm and working with affordable and compact Si-Ge Frequency Modulated Continuous Wave radar units is presented. The two radar sensors operates at 120 GHz with 19.5 GHz bandwidth and at 240 GHz with 34 GHz bandwidth. A new method for enhancing lateral resolution combined with a normalization procedure is proposed, leading to 0.33 central wavelength resolution for the 120 GHz radar transceiver and 0.47 for the 240 GHz radar unit. Lateral resolution is compared to a conventional focused beam imaging system. Objects of interest are displayed to reveal Synthetic Aperture Radar advantages in term of lateral resolution and depth of field for Non Destructive Testing and inspection purposes.