METHOD FOR NAVIGATION OF AIRCRAFT BY RADAR IMAGES OF EARTH SURFACE WITH APPLICATION OF DIGITAL AREA MODELS Russian patent published in 2009 - IPC G01S13/90 

FIELD: physics, measurement.

SUBSTANCE: invention is related to radio location, in particular to radio locating facilities of aircraft navigation. Achieved technical result is provided by application of site and point reference points during comparison of reference and working images, and clearance of limitations for AC trajectory, which is achieved by generation of reference radar image (RI) in process of motion with the help of digital area models, which are preliminarily prepared on the basis of digital area maps. Substance of invention consists in the fact that assessment of navigation errors of inertial control system is produced by means of maximum parametres of two-dimensional mutually correlating function (MCF) of reference and working RI, moreover, reference RI is calculated in process of AC motion with the help of digital area maps, which are prepared in advance on the basis of digital area maps. Assessment of error by course angle is produced by selection of highest maximum on multiple two-dimensional MCF calculated for preset range of reference RI coordinates system turn angles. MCF calculation is carried out for pair of multitudes of informative objects: "bright" points and "shadows" identified on working and reference RI with the help of procedure of adaptive threshold processing. For MCF calculation they use pairs of Cartesian coordinates of "bright" points and "shadows".

EFFECT: higher probability of correct identification of aircraft position (AC).

13 dwg