Improved image quality in multistatic microwave gauging

The application of the concept of imaging radar to microwave level gauging represents a prospect of increasing reliability to target detection. A high angular resolution with a limited number of array elements can only be achieved with the cost of increased side lobes. This problem can be modeled by a point spread function (PSF). The present paper proposes techniques to invert the PSF, using the example of a frequency modulated continuous wave (FMCW) system. The application of the Wiener filter and the Kalman filter across the angular domain exhibits promising improvements with respect to side lobe suppression and angular resolution. This can be demonstrated with results of both, simulations and measurements.