METHOD OF IDENTIFYING AND DETERMINING PARAMETERS OF IMAGE OF OBJECT ON RADAR IMAGES Russian patent published in 2014 - IPC G01S5/02 

FIELD: physics, navigation.

SUBSTANCE: invention relates to radar image processing methods. The method is carried out as follows. When probing an area of the earth's surface with synthetic aperture radar mounted on a carrier in form of an aircraft, the signal reflected from the earth's surface is received while simultaneously determining the spatial position of antenna phase centres using the aircraft navigation system and storing said spatial position. The signal obtained at the input of the synthetic aperture radar is presented in form of a sum of radar images of the object, the background and observation noise. The background on which the object is located along with observation noise is considered as a certain equivalent noise. For combined distinction and estimation of parameters (coordinates), Bayesian method is employed, which involves combined optimisation of said two operations. In accordance with the Bayesian optimality rule, posterior risk should be lowered on two parameters: estimating the discrete parameter of uncertainty i - determine the object, and estimating parameters (coordinates) of the object, where i is the type of the object. Combined risk minimisation may be performed in two steps: first based on an arbitrary estimation of parameters (coordinates) of the object for a fixed value i, and then for all i. Determination of parameters (coordinates) of the image of the object in this algorithm precedes the distinction of the objects themselves, although a Bayesian estimate is generated after determining the i-th object. An arbitrary estimate of coordinates of the object is obtained based on a method which is reduced using standard models of objects formed beforehand. Posterior risk minimisation on all possible i types of objects should be performed to distinguish objects. The distinction algorithm amounts to comparing averaged ratios of similarity with a set of threshold values generated beforehand for all types of objects.

EFFECT: faster processing of radar images.

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