FIELD: radar technology.
SUBSTANCE: invention relates to the field of radar technology, namely to methods for determining the coordinates of the inclined range and azimuth of overwater objects and objects above the underlying surface. The claimed method uses a digital ring multi-element equidistant phased array antenna. Due to the use of a grid that consistently generates the same radiation patterns, circular probing of the radar scene with an acutely directed beam is carried out. With a time delay proportional to the length of the trajectory formed by multiple reflections from objects inside the radar scene, the response signals returned at different angles, the so-called trajectories-sums representing the initial projection data of the tomographic method, are recorded. According to the projection data, as a result of digital reconstruction on a discrete hexagonal grid, the trajectory estimation is selected. For each unknown initial trajectory, a set of all possible estimates of it is selected with the corresponding lengths satisfying the condition of comparing the modulus of the length difference with the systematic sampling error. In addition, the projection data, if a response is received, is assigned the status of reliable events with a probability equal to one, if there is no response, impossible events with a probability equal to zero. For each received (i.e. come off) or missing event, the restoration of the original function of the radar scene is carried out using the theorems of multiplying the probabilities of independent events: finding reflecting objects at the vertices of the trajectory estimate, and then adding up all trajectory estimates satisfying the condition, from which a system of nonlinear equations with unknowns is formed. The solution by the method for successive Gauss exceptions of a system of nonlinear equations is a vector column of unknowns of the reconstructed probabilistic estimation of the radar scene with an estimate of the inclined range and an estimate of the azimuth of the position of objects inside the scene.
EFFECT: detection of hidden objects that are out of direct radio visibility or, due to design features, do not reflect, but scatter radio waves.
1 cl, 10 dwg
