METHOD OF ESTIMATING RADIAL VELOCITY OF AN OBJECT Russian patent published in 2019 - IPC G01S13/89 

FIELD: measurement technology.

SUBSTANCE: invention relates to methods of estimating radial velocity of objects along axis X, perpendicular to trajectory of flight of side-looking radar (SLR) – Y-axis. Assessment is carried out based on radar images (RI) of the area formed in a SLR during probing of ground and water surfaces using synthesized antenna arrays (SAA). Essence of the invention consists in the fact that according to the results of the locating, the radio holograms are formed and stored and the initial RI is formed when processing is matched with the speed of the carrier V_car. On the RI, objects are detected and their position X₀__obi Y₀__obi are determined and_. Range of measured speeds is specified, the interval of unambiguous estimation of radial speed is determined ΔV and divide the range of measured radial speeds into intervals of unambiguous determination of radial velocity. For each interval, using radio holograms, two fragments of radar images are formed, during synthesis of which two different shifts of values of radial velocity of the carrier along the axis X_car__{x_1} and V_{car_x_2}. Beginning of Y_{beg_1i} and Y_{beg_2i} and ending Y_{end_1i} and Y_end__2i synthesis of each fragment of radar map for i-th object along Y axis is determined, considering shift Y₀__obi in the presence of object speed in range from V_r__min up to V_{r_max} and due to input V_{car_x_1} and V_{car_x_2}. Then, for each uniqueness interval, matching of objects of two RIs is established, for each i object it is determined its position X_{max_1i} and Y_{max_1i} at first and X_max__2i and Y_max__2i on second radar image and find offset ΔX_{ob_12i} as the difference of its coordinates along the X axis on two radar images ΔX_{ob_12i}=X_{max_1i}-X_{max_2i}. Evaluating the radial velocity of the objects according to the corresponding formula. There are also determined possible order of operation when expanding the radar map of an object, an expression for determining the single-valued interval and a rule for forming a frequency grid for unambiguous determination of speed.

EFFECT: high accuracy of estimates of the radial velocity of SLR objects, which do not depend on the values of these velocities and on knowledge of the azimuths of the objects themselves.

8 cl, 7 dwg