Effectiveness of an algorithm of angular coordinates estimation of radio signal source by various processing methods of input implementations
The knowledge of angular coordinates of transmitter is indispensable in many practical tasks of radio detection, hydro acoustics and other fields of nowadays radio engineering. Current methods of spectral estimation using the data gained by the antenna array enable to form highest reliable estimates of angular coordinates of radio signal source. The works of many domestic and foreign scientists deal with the research and development of an algorithm of estimation of coordinates. Application of the algebraic approach to signal processing received by an antenna array enables to create all new algorithms of spectral estimation and to enhance effectiveness of the known ones. This work research displays the influence of algorithm structure on the effectiveness of angular coordinates estimation. Cases of application of an antenna array with parallel layout of elements, and also L-shaped antenna arrays and 2D - L-shaped are considered. The results of simulation and comparative analysis of the proposed algorithms are given. The information on angular coordinates is derived if there is matching between the azimuth and the angle of elevation when an antenna array with parallel layout of elements is used. Besides, if the angle of elevation is in the range from 0 to 90 degrees then its estimation can be uncertain. The problem of coordinates estimation in the range from 70 to 90 degrees is solved when using the L-shaped antenna array but the similar problem arises if the azimuth range is from 0 to 20 degrees. However this problem can be completely settled if two L-shaped antenna arrays in x-z and y-z planes are utilized, and SD is essentially reduced. In this way the estimation of the azimuth is not dependent on the estimation of the angle of elevation of the transmitter and vice versa. Thus the application of antenna arrays of various shapes and the change of algorithm structure can significantly increase the effectiveness of the utilized method and extend its field of application.