THE FEATURES OF USAGE THE MUSIC ALGORITHM FOR AN ELEVATIONANGLE MEASUREMENT OF LOW-LEVEL TARGETS OVER ROUGH SEA SURFACEKharkov, Ukraine, June 21-26, 2010

摘要

One of the toughest tasks of a modem radiolocation is measurement of elevation angle of the targets that lie low above the water [1]. The problem is caused by reflection of target energy off the surface of the sea and occurs when the separation between the target and its image is less than the resolving power of the antenna. Last years a number of articles concerning measurement of angle of arrival with use of the high spectral resolution methods [2] is published, method MUSIC [3] also. Results of many papers, for example [4], are based on use of the simplified models of multipath signals. They, as a rule, take into account direct and specular signal, but diffuse signals are substituted by white noise according to the model taken as a principle for MUSIC. However such approach does not correspond to real conditions of formation of signals over a rough surface of the sea or the land. As it is known [1,5], diffuse reflections are distributed extremely non-uniformly on angle of arrival, that does not correspond to characteristics of white spatial noise. Just this discrepancy creates uncertainty concerning method perspectives in actual environment, especially in the conditions of strong diffuse reflections.