Mathematical models and spatial characteristics of coherent and incoherent imaging systems

In this paper an effort of generalized approach description of image observation process was made. Block diagrams of both types of imaging systems (coherent and incoherent) are given. Peculiarities of passive imaging system permit one to formulate expressions for receiving system spatial characteristics (impulse response (blurring function) and spatial spectrum). Coherent systems were described by observation equations. Computer simulation of incoherent system spatial characteristics was performed. The necessity of image restoration for sparse antenna array was shown.