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Non-Gradient Sar-Tracking Images Algorithm of Phase Correction Under The Signal
Trajectory Distortions**

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O. V. Sytnik

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**Institute of Radio Physics
and Electronics of Ukraine Academy of Sciences**

Received March 26, 2008

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Problems of construction of adaptive
algorithms of synthesizing of radar-tracking images of a spreading surface using
signals of a coherent onboard radar are considered. The offered algorithm
concerns to a class of self-adjusted algorithms in which the information about
trajectory errors is taken directly from the reflected signal. As information
parameters the estimation of displacement average on inclined range the Doppler
spectrum on an interval of synthesizing and its derivative of higher order is
used. It provides an opportunity of automatic correction of the images caused
not only errors on speed of flight of the carrier but allows to consider the
errors caused by not considered acceleration and the speed of change of
acceleration. Search of an optimum in sense of minimum error mean square
correcting factor of a basic function is carried out by non-gradient algorithm.
Results of processing of signals of a SAR are resulted. Features of work of
algorithm in various conditions are discussed.