An focal plane array space variant model for PMMW imaging

In this paper, based on research the principle of the focal plane array (FPA) in passive millimetre wave (PMMW) imaging, we present a spatial-variant image mathematical model by introducing the focal-image plane transformation operator and spherical projection geometrical relationship and non-uniform Multiple-Beam Antenna (MBA) model. This model can express separately the process of the propagation and the accumulation and receive which are the space variable factors of three different attributes on the effects of the imaging quality. Based on analysis FPA PMMW imaging model and space-variant characteristics analysis, we present a spherical anti-projection transformation method to eliminate space-variant characteristics of the PSF and geometric correction processing.