Efficiency of the Angular Coordinate Estimation under the Action of Spatially Correlated Interferences and Mutual Influence of Spatial Channels

Abstract

The problem of the direction determination to the radio radiation source under the action of spatially correlated interferences is solving. Algorithms for the optimal angular coordinate estimation for the deterministic signal, the quasi-deterministic signal, and the random Gaussian signal are considered. The error of the direction determination to the radio radiation source is calculated on basis of the Cramer-Rao bound as applied to the signal-interfering situation under consideration for a few receiving channel. Spatial interference cancellation is carried out taking into account the effect of the mutual coupling of spatial channels and circuit noise. A changing in the matrix of mutual impedances of the antenna system leads to their mismatch with the load impedances. A problem of impedance matching depends on the signal-interfering situation has been solved. The gain in the accuracy of maximum likelihood estimation the angular coordinates obtained with optimal matching is calculated.