Description: The relevance of the application of speckle interferometry measurements at this time is considered. Lists the features of the method and its use. An expression that describes the signal observed at the receiver. Analyzed the resolution of the measurement system and its dependence on the direction of the point of reception. The possibility of recovery of the functions of the complex reflection coefficient of the observed signal is considered. The correlation function of the observed signal is founded and analyzed. The width of the correlation function, which is a characteristic width of speckle and angular size of the speckles is calculated.
Keywords: coherency, speckle pattern, Fraunhofer zone, correlation, correlation radius, resolution, rough surface