A new two-dimensional millimeter wave imaging radiometer

Synthetic aperture radiometer has the potential to meet the spatial resolution requirement of passive microwave remote sensing from space. This paper introduces a prototype of two-dimensional imaging radiometer at millimeter wave (MMW) band. A G Matrix calibration approach and an iterative gradient inversion method are presented to obtain the brightness temperature image. Total least squares (TLS) image processing algorithms for improving the brightness temperature image are also presented. Experimental results show that the proposed radiometer can give brightness temperature image of natural scenes and the image processing algorithms can improve image quality of the radiometer.