An Experimental Study of Two-Dimensional Direction Finding Methods in a Passive Radiotelemetric Complex with an Antenna Array

We analyze the results of a full-scale experiment on two-dimensional direction finding (with respect to the azimuth and the elevation angle) in a passive radiotelemetric complex in the decimeter-wave range. The complex includes an adaptive antenna array, whose sheet has rectangular topology. Direction finding objects transmit both a tone signal and a phase-manipulated signal, which is in most demand in modern telemetry complexes. Scenarios with one, two, or three sources on the air are considered. Special attention is paid to cases where two sources are located in the main beam of the directional pattern. The work proposes a number of approaches which allow one to reduce the computational complexity of the processing method. The experimental results confirm their applicability for real-time operation in domestic complexes of this type.