On the usability of low-cost inertial navigation systems for free-hand SAR imaging at GPR-frequencies

摘要

This contribution investigates the influence of Inertial Navigation System (INS) uncertainties for antenna positioning on Synthetic Aperture Radar (SAR) imaging. Therefore, a SAR simulator, which provides predefined positioning uncertainties is introduced. Two parameters of the resulting SARimage, i.e., the spatial resolution and the detection shift of a point target are investigated in range and azimuth direction. Moreover, a simple INS, which relies on an accelerometer, is introduced and the particular positioning method is discussed in detail. The applicability of the presented INS is investigated by means of SAR-measurements, which were performed with a Ground Penetrating Radar (GPR) antenna and a Vector Network Analyzer (VNA). Moreover, the resulting SAR images are evaluated by the defined properties and compared to SAR images, which rely on the same raw data, but utilize a positioning vector gathered by a high precision mmWave-radar.