A Two-Dimensional Millimeter Wave Imaging Radiometer for Object Detection
Synthetic aperture radiometer has the potential to meet the spatial resolution requirement of passive microwave remote sensing from space. The prototype of two-dimensional imaging radiometer at millimeter wave (MMW) band based on minimum-redundancy linear array is described. A G Matrix calibration approach and an iterative gradient inversion method are presented to obtain the brightness temperature image. Due to the inherent physical properties of passive radiometer imaging and associated hardware, images have poor contrast and low signal to noise ratio. Standard segmentation algorithms are unable to detect objects. Algorithms for improving the brightness temperature image are also presented.