Investigation of Super-Resolution Methods for Direction Finding of Broadband Signals by an Antenna Array

The possibilities of direction finding of broadband signals by an antenna array in the presence of interferences are considered on the basis of methods of super-resolution of Capone and MUSIC. Based on the known relationships describing the direction-finding patterns formed by the antenna array in the direction-finding of narrow-band signals, expressions were obtained in the article for optimal detection of broadband signals. To ensure the possibility of technical implementation of methods in excess of the resolution for the direction-finding of broadband signals, it is proposed in the article for the finite number of frequencies of the broadband signal spectrum to optimally form the direction-finding relief. For the remaining frequencies of the signal spectrum, approximate using various functions. The results of the simulation showed that the more frequencies of the signal spectrum in which the direction-finding relief is formed optimally and the higher the degree of the approximating function, the higher the accuracy of the direction-finding spectrum of the broadband signal. However, this also leads to an increase in hardware and time costs. The main regularities providing formation of the direction finding relief when receiving and processing of broadband signals are derived. Numerical simulation of the obtained regularities is carried out.